Three-phase induction motors

Transcription

1 Installation & maintenance Three-phase induction motors LS / LSES, aluminium motors FLSES, cast iron motors PLSES, IP23 drip-proof motors Part number:

2 IMPORTANT These symbols appear in this document whenever it is important to take special precautions during installation, operation, maintenance or servicing of the motors. It is essential that electric motors are installed by experienced, qualified and authorized personnel. In accordance with the main requirements of EU Directives, the safety of people, animals and property should be ensured when fitting the motors into machines. Particular attention should be given to equipotential ground or earthing connections. The noise level of the machines, measured under standard conditions, conforms to the requirements of the standard. The following preliminary precautions must be taken before working on any stationary device: mains voltage disconnected and no residual voltage present careful examination of the causes of the stoppage (blocked transmission - loss of phase - cut-out due to thermal protection - lack of lubrication, etc) 2 Installation and maintenance - Three-phase induction motors

3 Dear Customer, You have just acquired a LEROY-SOMER motor. This motor benefits from the experience of one of the largest manufacturers in the world, using state-of-the-art technology in automation, specially selected materials and rigorous quality control. As a result, the regulatory authorities have awarded our motor factories the ISO Edition 2008 international certificate. We thank you for making this choice, and would ask you to read the contents of this manual. By observing a few essential rules, you will ensure problem-free operation for many years. MOTEURS LEROY-SOMER CE conformity Our motors conform to standard EN (IEC 34), and to the directives 2006/95/EC (low voltage) modified by Directive 2006/42/EC (machine), which is demonstrated by their marking with the symbol MOTEURS LEROY-SOMER USINE DECLARATION OF CONFORMITY AND INCORPORATION LEROY-SOMER MOTORS declares that the components : conform to the harmonized standard EN (IEC 34) and thus meet the essential requirements of Low Voltage Directive 2006/95/EC of 12 December The components thus defined also meet the essential requirements of the Electromagnetic Compatibility Directive 2004/108/EC of 15 December 2004, if they are used within certain voltage limits (EN 60038). By reason of such conformity, these component ranges may be used in machines governed by the Machinery Directive 98/37/CE, provided that the method of integration or incorporation and/or assembly conforms to at least the regulations in standard EN "Electrical Equipment for Machinery" and our installation manual. The components defined above must not be installed unless the machine in which they are incorporated has been declared as conforming to the relevant directives. N.B. : When components are powered by specially adapted electronic converters and/or servo-controlled by electronic control-command devices, they must be installed by a professional person. This person must take responsibility for complying with the regulations concerning electromagnetic compatibility in the country where the machine is used. Declaration made by At On Quality Director MOTEURS LEROY-SOMER Signature MOTEURS LEROY-SOMER (SIEGE SOCIAL BD MARCELLIN LEROY ANGOULEME CEDEX) SOCIETE ANONYME AU CAPITAL DE F - RCS ANGOULEME B SIRET NOTE : LEROY-SOMER reserves the right to modify the characteristics of its products at any time in order to incorporate the latest technological developments. The information contained in this document may therefore be changed without notice. Copyright 2017 : MOTEURS LEROY-SOMER This document is the property of MOTEURS LEROY-SOMER. It may not be reproduced in any form without prior authorization. All brands and models have been registered and patents applied for. Installation and maintenance - Three-phase induction motors 3

4 CONTENTS 1 - RECEIPT Identification Storage ASSEMBLY Checking the insulation Location - ventilation Coupling Electrical guidelines Mains connection ROUTINE MAINTENANCE Lubrication Bearing maintenance PREVENTIVE MAINTENANCE TROUBLESHOOTING GUIDE CORRECTIVE MAINTENANCE: GENERAL Dismantling the motor Checks before reassembly Mounting the bearings on the shaft Reassembling the motor Reassembling the terminal box POSITION OF LIFTING RINGS SPARE PARTS RECYCLING DISMANTLING AND REASSEMBLY PROCEDURES 10 - LS/LSES MOTORS to 160 MP/LR motors M/L/LU, 180 MT/LR motors L/LUR, 200 L/LR/LU, 225 ST/MT/MR, 250 MZ motors MG, 250 ME/MF, 280 SC/MC, 315 SN motors SU/SK/MK, 315 (except SN) motors FLS/FLSES MOTORS to 132 motors , 180 MR motors M/L/LUR, 200 LU, 225 MR/SR motors M to 280 motors to 355 LD motors PLS/PLSES MOTORS LG/LGU, 200 M/L/LP/LU/LR, 225 MR motors MG, 250, 280 SC/SD/MC/MD motors MG, 315 motors...50 INDEX Adjustment...8 Alarms - early warning...12 Assembly...6 Balancing...7 Belts...9 Built-in thermal protection...12 Cable gland...13 Cables: cross-section Capacitors Connection...15 Connection diagrams...15 Corrective maintenance...22 Coupling Coupling sleeves...8 Digistart...10 Direction of rotation...15 Draining condensation...16 Earth terminal...15 Earthing European directives...5 Frequency inverter Greasing - Grease nipples Handling...7 Identification...5 Inertia flywheel...8 Insulation...6 Lifting rings...23 Location...7 Logos...5 Lubrication...16 Mains connection...13 Nameplate...5 Power...10 Power supply...15 Preventive maintenance Protection...12 Pulleys...9 Receipt...5 Routine maintenance Shields Slide rails...9 Space heaters...12 Spare parts Starting...10 Storage...6 Terminal box...13 Terminal box: tightening the nuts...15 Tie rods: tightening...22 Tolerances...8 Troubleshooting...21 Ventilation Installation and maintenance - Three-phase induction motors

5 RECEIPT 1 - RECEIPT On receipt of your motor, check that it has not suffered any damage in transit. If there are obvious signs of knocks, contact the carrier (you may able to claim on their insurance) and after a visual check, turn the motor by hand to detect any malfunction Identification As soon as you receive the motor, check that the nameplate on the machine conforms to your order. * Other logos may be used as an optional extra: This must be agreed prior to ordering. Definition of symbols used on nameplates: Legal mark of conformity of product to the requirements of European Directives MOT 3 ~ : 3-phase A.C. motor LSES : Series 132 : Frame size S : Housing symbol Motor no : Motor batch number E : Month of production 11 : Year of production 001 : Serial number IE2 : Efficiency class 83.8% : Efficiency at 4/4 load IP55 IK08 : Index of protection I cl. F : Insulation class F 40 C : Ambient operating temperature S1 : Duty - Duty (operating) factor kg : Weight V : Supply voltage Hz : Supply frequency min -1 : Revolutions per minute (rpm) kw : Rated output power cos ϕ : Power factor A : Rated current Δ : Delta connection Y : Star connection Bearings DE : Drive end bearing NDE : Non drive end bearing g : Amount of grease at each regreasing (in g) h : Regreasing interval (in hours) POLYREX EM103 : Type of grease A H : Vibration level : Balancing mode Please quote when ordering spare parts Installation and maintenance - Three-phase induction motors 5

6 ASSEMBLY Storage Prior to commissioning, machines should be stored in a horizontal position: - Away from humidity: at relative humidity levels greater than 90% the machine insulation can drop very rapidly, to just above zero at around 100%. The state of the anti-rust protection on unpainted parts should be monitored. For very long storage periods the motor can be placed in a sealed package (for example heat-shrunk plastic) containing sachets of desiccant. - Away from frequent significant variations in temperature, to avoid the risk of condensation. During storage the drain plugs must be removed to allow condensation water to escape. - If the area is subject to vibration, try to reduce the effect of this vibration by placing the motor on a damping support (rubber plate or similar) and turn the rotor a fraction of a turn once a fortnight to prevent the bearing rings from becoming marked. - Do not discard the rotor locking device (where there are roller bearings). Even if the motor has been stored in the correct conditions, certain checks must be carried out before it is started up: Greasing Bearings which cannot be regreased Maximum storage: 3 years. After this time, replace the bearings (see section 6.3). Bearings which can be regreased Storage period Grease grade 2 less than 6 months more than 6 months less than 1 year more than 1 year less than 5 years more than 5 years Grease grade 3 less than 1 year more than 1 year less than 2 years more than 2 years and less than 5 years more than 5 years The motor can be commissioned without regreasing. Regrease before commissioning, as described in section 3.1 Dismantle the bearing - Clean it - Replace the grease completely Change the bearing - Regrease it completely Greases used by LEROY-SOMER (see nameplate): - grade 3: ESSO UNIREX N 3 - POLYREX EM Checking the insulation Before starting the motor, it is advisable to check the insulation between the phases and earth, and between phases. This check is essential if the motor has been stored for longer than 6 months or if it has been kept in a damp atmosphere. This measurement must be carried out using a megohmmeter at 500V D.C. (do not use a magnetoelectric system). It is better to carry out an initial test at 30 or 50 volts and if the insulation is greater than 1 megohm, carry out a second test at 500 volts for 60 seconds. The insulation value must be at least 10 megohms in cold state. If this value cannot be achieved, or if the motor may have been splashed with water or salt spray, or kept for a long period in a very humid place or if it is covered with condensation, it is advisable to dry the stator for 24 hours in a drying oven at a temperature of between 110 C and 120 C. If it is not possible to place the motor in a drying oven: - Switch on the motor, with the rotor locked, at 3-phase A.C. voltage reduced to approximately 10% of the rated voltage, for 12 hours (use an induction regulator or a reduction transformer with adjustable outlets). For slip-ring motors, this test should be performed with the rotor short-circuited. - Or supply the 3 phases in series with a D.C. current, with the voltage at 1 to 2% of the rated voltage (use a D.C. generator with independent excitation or batteries for motors of less than 22 kw). - NB: The A.C. current must be monitored using a clamp ammeter, and the D.C. current using a shunt ammeter. This current must not exceed 60% of the rated current. It is advisable to place a thermometer on the motor housing: if the temperature exceeds 70 C, reduce the indicated voltage or current by 5% of the original value for every 10 difference. While it is drying, all the motor orifices must be open (terminal box, drain holes). M 2 - ASSEMBLY In all cases, compatibility of the motor and its environment must be guaranteed before its installation and also throughout its life. Electric motors are industrial products. They must therefore be installed by qualified, experienced and authorized personnel. The safety of people, animals and property must be ensured when fitting the motors into machines (please refer to current standards). For all insulation or dielectric tests, it is advisable to earth the thermal probes and/or accessories. Warning: If the high voltage test, carried out at the factory before dispatch, needs to be repeated, it should be performed at half the standard voltage, ie.: 1/2 (2U+1000V). Check that the capacitive effect resulting from the high voltage test is eliminated before connecting the terminals to earth. 6 Installation and maintenance - Three-phase induction motors

7 ASSEMBLY Prior to commissioning for all motors: Rotate the motor at no load (no mechanical load) for 2 to 5 minutes, checking that there is no abnormal noise. If there is any abnormal noise, see section Location - ventilation TEFV motors Our motors are cooled in accordance with method IC 411 (standard IEC 34-6), i.e. «machine cooled by its surface, using the ambient fluid (air) flowing along the machine». The fan at the non drive end cools the motor. Air is sucked in through the grille of a fan cover (which provides protection against the risk of direct contact with the fan in accordance with standard IEC 34-5) and blown along the housing fins to ensure thermal equilibrium of the motor whatever the direction of rotation. 1/4 H min (with a minimum distance of 25 mm) Positioning The motor must be mounted in the position specified on the order, on a base which is rigid enough to prevent distortion and vibration. Where the motor feet have six fixing holes, it is preferable to use those which correspond to the standard dimensions for the motor power rating (refer to the technical catalogue for induction motors), or, failing that, to those shown at B2. B 1 B 2 Ensure there is easy access to the terminal box, the condensation drain plugs and, if appropriate, to the grease nipples. Use lifting equipment which is compatible with the weight of the motor (indicated on the nameplate). H Drip-proof motors Location ventilation Our motors are cooled in accordance with method IC 01 (standard IEC 34-6), ie. «machine cooled by means of the ambient fluid (air) circulating inside the machine». A fan at the non-drive end cools the motor. Air is sucked in at the front of the motor and blown along the fan cover to ensure thermal equilibrium of the motor whatever the direction of rotation. When the motor is fitted with lifting rings, they are for lifting the motor on its own and must not be used to lift the whole machine after the motor has been fitted to it. Note 1: When installing a suspended motor, it is essential to provide protection in case the fixing breaks. Note 2: Never stand on the motor Coupling Preparation Turn the motor by hand before coupling to detect any possible fault due to handling. Remove any protection from the shaft extension. air inlet Ø H max H The motor must be installed in an adequately ventilated area, with clearance for the air intake and outlet of at least onequarter of the frame size. Obstruction (clogging) - even accidental - of the fan cover grille has an adverse effect on motor operation. In the case of vertical operation with the shaft extension facing down, it is advisable to fit the motor with a drip cover to prevent penetration by any foreign bodies. It is also necessary to check that the hot air is not being recycled. If it is, pipes must be provided for the intake of cold air and the discharge of hot air, in order prevent abnormal motor temperature rise. In this case, if the air is not circulated by an auxiliary fan, the dimensions of the pipes must be such that the pressure losses are negligible compared to those of the motor. Drain off any condensation water which may have formed inside the motor by removing the plugs from the drain holes. Rotor locking device For made-to-order motors with roller bearings, remove the rotor locking device. In exceptional circumstances when the motor has to be moved after the coupling device has been fitted, the rotor must be reimmobilised. Installation and maintenance - Three-phase induction motors 7

8 ASSEMBLY Balancing Rotating machines are balanced in accordance with standard ISO 8821: - Half-key when the shaft extension is marked H - No key when the shaft extension is marked N. - Full key when the shaft extension is marked F. and any coupling element (pulley, coupling sleeve, slip-ring, etc) must therefore be balanced accordingly. Motor with 2 shaft extensions: If the second shaft extension is not used, in order to comply with the balancing class, the key or half-key must be fixed firmly in the keyway so that it is not thrown out during rotation (H or F balancing) and must be protected against direct contact. Precautions All measures must be taken to ensure protection against the risks which arise when there are rotating parts (coupling sleeve, pulley, belt etc). If a motor is started up without a coupling device having been fitted, carefully immobilize the key in its location. Beware of backdriving when the motor is switched off. The appropriate precautions must be taken: - For pumps, a non-return valve must be installed. - For mechanical devices, install a backstop or a holding brake. - etc.. Tolerances and adjustments The standard tolerances are applicable to the mechanical characteristics given in our catalogues. They comply fully with the requirements of IEC standard Users must adhere strictly to the instructions provided by the transmission device supplier. - Avoid impacts which could damage the bearings. Use a spanner and the tapped hole of the shaft end with a special lubricant (e.g. molykote grease) to make it easier to fit the coupling. The hub of the transmission device must be: - Fully in contact with the shoulder of the shaft or, if this is missing, against the metal stop ring which forms a labyrinth seal and thus locks the bearing in place (do not crush the seal). - Longer than the shaft extension (2 to 3 mm) so that it can be tightened using a screw and washer. If it is not, a spacer ring must be inserted without cutting the key (if this ring is large, it must be balanced). Applied to shoulder of shaft Applied to stop ring If there is a second shaft extension, it must only be used for direct coupling and the same recommendations must be followed. The 2nd shaft extension may also be smaller than the main shaft extension, and under no circumstances can it deliver torques greater than half the rated torque. The inertia flywheels device must not be mounted directly onto the shaft extension, but installed between end shield and device using a coupling. Mounting a face mounted motor Mounting face mounted motors IM B14 (IM 3601) and IM B34 (IM 2101). Max. screw insertion length when mounting face mounted motors IM B34 and IM B14. Max. insertion (mm) LSES 71 F75 M5 / F85 M6 13 LSES 80 F100 M6 11 LSES 90 F115 M8 11 LSES 100 F130 M8 11 LSES 112 F130 M8 11 LSES 132 F215 M12 11 LSES 160 F215 M12 15 Direct connection onto the machine When the mobile device (pump or fan turbine) is mounted directly on the motor shaft extension, check that this device is perfectly balanced and that the radial force and the axial thrust are within the limits indicated in the catalogue for the bearing withstand. Direct connection using a flexible coupling Selection of the coupling sleeve should take account of the rated torque to be transmitted and the safety factor dependent on the starting conditions for the electric motor. The machines must be carefully aligned, so that any lack of concentricity and parallelism in the two coupling halves is compatible with the recommendations of the coupling sleeve manufacturer. Both parts of the coupling should be provisionally assembled to make it easier to alter their relative position. Adjust the parallel plane of both shafts using a gauge. Measure the distance between the two coupling surfaces at one point on the circumference. Rotate them 90, 180 and 270 in relation to this initial position, and measure each time. The difference between the two extremes of the value «x» must not exceed 0.05 mm for standard couplings. 8 Installation and maintenance - Three-phase induction motors

9 ASSEMBLY x To perfect this adjustment and at the same time check the concentricity of the two shafts, fit 2 gauges as shown in the diagram and slowly turn both shafts. The deviations registered by either shaft will indicate the need for either an axial or radial adjustment if the deviation exceeds 0.05mm. Direct connection using a rigid coupling Both shafts must be aligned so as to adhere to the tolerances of the coupling sleeve manufacturer. Maintain the minimum distance between the two shaft extensions to allow for expansion of the motor shaft and the load shaft. Ø A Ø (mm) A (mm) min. 9 to Transmission via belt pulleys The user can choose the diameter of the pulleys. Cast iron pulleys with a diameter greater than 315 are not recommended for rotation speeds of 3000 min -1. Flat belts cannot be used for rotation speeds of 3000 min -1 or more. Positioning the belts So that the belts can be correctly positioned, allow for possible adjustment of approximately 3% with respect to the calculated distance E. Force must never be used when fitting the belts. For notched belts, position the notches in the pulley grooves E Protect all rotating devices before power-up. Adjusting the tension of the belts The tension of the belts must be adjusted very carefully in accordance with the recommendations of the belt supplier and the calculations made when the product was specified. Reminder: - Tension too great = unnecessary force on the end shields which could lead to premature wear of the bearing unit (end shield-bearings) and eventually break the shaft. - Too little tension = vibration (wearing of the bearing unit). Fixed distance between centers: Place a belt tensioning pulley on the slack side of the belts: - Smooth pulley on the outside of the belt - Grooved pulley on the inside of the belts when using V-belts. Adjustable distance between centers: The motor is usually mounted on slide rails, which enables optimum adjustment of the pulley alignment and the belt tension. Place the slide rails on a perfectly horizontal baseplate. The lengthways position of the slide rails is determined by the length of the belt, and the crossways position by the pulley of the machine being driven. Mount the slide rails firmly with the tension screws in the direction shown in the diagram (the slide rail screw on the belt side between the motor and the machine being driven). Fix the slide rails onto the baseplate and adjust the belt tension as before. Tension screw Tension screw Aligning the pulleys Check that the motor shaft is completely parallel with that of the receiving pulley. Installation and maintenance - Three-phase induction motors 9

10 ASSEMBLY Optional: Standard slide rails (conforming to standard NFC ) These steel slide rails are supplied with tension screws and the 4 nuts and bolts for fixing the motor on the slide rails, but the fixing bolts for the slide rails are not supplied. X Z Y H ØJ L A E K Motor Type Dimensions Weight per pair frame size of slide rail A E H K L X Y Z Ø J of slide rails (kg) 90 G 90/8 PM , 112 and 132 G 132/10 PM and 180 G 180/12 PM and 225 G 225/16 PF and 280 G 280/20 PF and 355 G 355/24 PF Electrical guidelines Limiting problems caused by motor starting In order to protect the installation, all significant temperature rises in the cabling conduits must be prevented, while ensuring that the protection devices are not triggered during starting. Operating problems in other equipment connected to the same supply are due to the voltage drop caused by the current demand on starting - many times greater than the current absorbed by the motor at full load (approximately 7). See the LEROY-SOMER induction motors technical catalogue). Even though the mains supplies increasingly allow D.O.L. starting, the current inrush must be reduced for certain installations. Jolt-free operation and soft starting ensure greater ease of use and an increased lifespan for the machines being driven. The two essential parameters for starting cage induction motors are: - starting torque - starting current The starting torque and the resistive torque determine the starting time. Depending on the load being driven, it may be necessary to adapt the torque and the current to the machine starting time and to the possibilities of the mains power supply. The five essential modes are: - D.O.L. starting - Star/delta starting - Soft starting with autotransformer - Soft starting with resistors - Electronic starting The «electronic» starting modes control the voltage at the motor terminals during the entire starting phase and enable very soft, jolt-free starting LEROY-SOMER «Digistart» electronic starter This is a multi-function electronic system with a microcontroller, which is used with all 3-phase cage induction motors. It provides soft starting of the motor with: - Reduction of the starting current - Gradual, jolt-free acceleration, achieved by controlling the current absorbed by the motor. After starting, the DIGISTART performs additional motor control functions in its other operating phases: steady state and deceleration to 1600 A models - Supply: 220 to 700 V - 50/60 Hz DIGISTART is economical to install, as a fused switch is the only additional device needed. 10 Installation and maintenance - Three-phase induction motors

11 ASSEMBLY Other control systems Frequency inverters, flux vector control, etc. Special precautions need to be taken when standard induction motors are being used for variable speed control, powered by a frequency inverter or voltage controller: The reference voltage (drive output or motor input) is 400V at 50 Hz: The drive must deliver a constant voltage/frequency signal to the motor in the 50 Hz operating range. Beyond the 25/50 Hz range, ensure that the fan and bearing unit are suitable. During prolonged operation at low speed, cooling efficiency is greatly diminished. It is therefore advisable to install a forced ventilation unit that will produce a constant flow of air independently of the motor speed. In prolonged operation at high speed, the fan may make excessive noise. It is again advisable to install a forced ventilation system. Effect of cooling 1 2/3 1/3 Forced ventilation (temperature rise) Natural cooling P/PN = f (N/NS) Forced ventilation for N > 3600 min-1 N / Ns 0 1/3 2/3 1 Operating speed/ Synchronous speed If the frequency exceeds 50 Hz: a - Carefully check that all the components on a particular transmission are properly aligned. b - The voltage remains constant above 50 Hz. c - The power supplied by the motor up to 60 Hz remains constant (make sure that the power absorbed by the load does not vary differently in this frequency range). d - Check that the application speed does not exceed the synchronous speed values: - 2P --> 3600 min -1 motors - 4P --> 1800 min -1 motors - 6P --> 1200 min -1 motors e - For all other frequency and/or voltage limits, additional precautions must be taken for derating, bearings, ventilation, noise, etc: please consult Leroy-Somer. Check that the vibration level of the assembled machine complies with standard ISO The user is responsible for protecting the motor and drive equipment from hazardous currents and overvoltages in the winding. These instructions cannot guarantee efficiency in all cases Permissible starting times and locked rotor times The starting times must remain within the limits stated below on condition that the number of starts per hour is 6 or less. Three successive cold starts and two consecutive warm starts are allowed. Time (s) Id/In Cold start Permissible motor starting time in relation to the ratio I D / I N Earthing (see section 2.5.5) Hot start Power factor compensation capacitors Before any work is carried out on the motor or in the cabinet, check that the capacitors are isolated and/or discharged (read the voltage at the terminals) Motor protection devices On-line protection Adjusting the thermal protection It should be adjusted to the value of the current read on the motor nameplate for the connected mains voltage and frequency. Thermal magnetic protection The motors must be protected by a thermal magnetic device located between the isolating switch and the motor. These protection devices provide total protection of the motor against non-transient overloads. This device can be accompanied by fused circuit-breakers. Built-in direct thermal protection For low rated currents, bimetallic strip-type protection may be used. The line current passes through the strip, which shuts down or restores the supply circuit as necessary. The design of this type of protection allows for manual or automatic reset Built-in indirect thermal protection The motors can be equipped with optional heat sensors. These sensors can be used to monitor temperature changes at hot spots : - overload detection - cooling check - Monitoring strategic points for maintenance of the installation Installation and maintenance - Three-phase induction motors 11

12 ASSEMBLY It must be emphasized that these sensors cannot be used to carry out direct adjustments to the motor operating cycles. Type Operating principle Operating curve Breaking capacity (A) Protection provided Mounting Number required* Normally closed thermostat PTO bimetallic strip, indirectly heated operates on opening (0) I O T NRT 1.6 at 250 V with cos j 0.6 general surveillance for non-transient overloads Mounted on control circuit 2 or 3 in series Normally open thermostat PTF bimetallic strip, indirectly heated, contact on closing (F) I F T NRT 1.6 at 250 V with cos j 0.6 general surveillance for non-transient overloads Mounted on control circuit 2 or 3 in parallel Positive temperature coefficient thermistor PTC Variable non-linear resistor, indirectly heated R NRT T 0 general surveillance for transient overloads Mounted with associated relay on control circuit 3 in series Thermocouples T (T<150 C) Constantan copper K (T<1000 C) Copper Copper-Nickel V Peltier effect 0 T continuous surveillance at hot spots at regular intervals Mounted on control panels with associated reading device (or recording device) 1 per hot spot Platinum resistance thermometer PT 100 Variable linear resistance, indirectly heated R T 0 high accuracy continuous surveillance at key hot spots Mounted on control panels with associated reading device (or recording device) 1 per hot spot - NRT: nominal running temperature. - The NRTs are chosen according to the position of the sensor in the motor and the temperature rise class. * The number of devices affects the protection of the windings. Alarm and early warning All protective equipment can be backed up by another type of protection (with different NRTs): The first device will then act as an early warning (light or sound signals given without shutting down the power circuits), and the second device will be the alarm (shutting down the power circuits). Warning: Depending on the type of protection, the motor may remain powered-up. Ensure that the mains supply is disconnected before any work is carried out in the terminal box or in the cabinet. Protection against condensation: space heaters Identification: 1 red label A glass fibre flexible resistor is fixed on 1 or 2 coil end turns. This resistor heats the machines when stopped and thus prevents condensation inside the machines. Power supply: 230V single-phase unless otherwise specified by the customer. If the drain plugs at the bottom of the motor have not been removed at the time of installation, they must be opened approximately every 6 months. Warning: Check that the space heaters are powered down before any work is carried out in the terminal box or in the cabinet. 12 Installation and maintenance - Three-phase induction motors

13 ASSEMBLY Mains connection Terminal box Placed as standard on the top of the motor near the drive end, for forms IM B3, B5, B14, the terminal box has IP 55 protection. Warning: The position of the terminal box cannot be easily modified, even with flanged motors, as the condensation drain holes must be at the bottom. Cable gland The standard position of the cable gland (1) is on the right, seen from the drive end. If the non-standard position of the cable gland has not been correctly specified on the order, or is no longer suitable, the symmetrical construction of the terminal box enables it to be turned in any of the 4 directions except for position (2) on flange-mounted motors (B5). A cable gland must never open upwards. Check that the incoming cables have bends of such a radius as to prevent water from running into the cable gland. A Standard position Standard position NB: motors are fitted with plugs or a support plate as standard. Tightening capacity of cable glands Adapt the cable gland and its reducer if present to the diameter of the cable being used. In order to preserve the motor s original IP55 protection, it is essential to tighten the cable gland seal correctly (so that it cannot be unscrewed by hand). When there are several cable glands and some are not being used, ensure that they are always covered and tighten them so that they also cannot be unscrewed by hand. Ø mini Ø maxi Type of cable gland Ø min. - Ø max. (mm) cable Polyamide cable gland Brass cable gland ISO M ISO M ISO M ISO M ISO M ISO M ISO M Installation and maintenance - Three-phase induction motors 13

14 ASSEMBLY Cross-section of the power supply cables The higher the current, the greater the voltage drop in the cables (standard NFC or end user s national standard). The voltage drop should therefore be calculated for the starting current to see if this is suitable for the application. If the most important criterion is the starting torque (or starting time), the voltage drop should be limited to 3% maximum (the equivalent of a loss of torque of around 6 to 8%). The chart below can be used to select the conductors according to the length of the supply cables and the starting current, in order to limit the voltage drop to 3% maximum. Length in m Maximum voltage drop 3 % (3-phase circuits - copper cable) Conductor cross-section This table does not allow the installer to dispense with checking the protective systems. Current in amps Starting current For motors with flying leads, the power supply cable must not be used for handling Connection of the motor-drive unit It is the responsibility of the user and/or the installer to connect the motor-drive system in accordance with the current legislation and regulations in the country of use. This is particularly important as concerns cable size and connection of earths and grounds. The following information is given for guidance only, and should never be used as a substitute for the current standards, nor does it relieve the installer of his responsibility. A motor-drive system which has been earthed in accordance with good practice will contribute significantly to reducing the voltage on the shaft and the motor casing, resulting in fewer high-frequency leakage currents. Premature breakage of bearings and auxiliary equipment such as encoders, should also be avoided wherever possible. To ensure the safety of personnel, the size of the earthing cables should be determined individually in accordance with local regulations. To ensure the safety of motors with frame size 315 mm or above, we recommend installing grounding strips between the terminal box and the feet and/or the motor and the driven machine. For motors with a power rating of 30 kw or higher, the use of shielded single-core cables is strongly recommended. The motor-drive wiring must be symmetrical (U,V,W at the motor end must correspond to U,V,W at the drive end) with the cable shielding earthed both at the motor end and at the drive end. For high-powered motors, unshielded single-core cables can be used as long as they are installed together in a metal cable duct earthed on both sides with a grounding strip. Cables must be kept as short as possible. Typically, shielded cables up to 20 m long can be used without additional precautions. Beyond this length, special measures such as adding filters at the drive output should be considered. 14 Installation and maintenance - Three-phase induction motors

15 ASSEMBLY Terminal block wiring diagram All motors are supplied with a wiring diagram in the terminal box*. The connector links required for coupling can be found inside the terminal box. Single-speed motors are fitted with a block of 6 terminals complying with standard NFC , with the terminal markings complying with IEC 34-8 (or NFC ) Connecting the power supply cables to the terminal block The cables must be fitted with connectors suitable for the cable cross-section and the terminal diameter. They must be crimped in accordance with the connector supplier s instructions. Connection must be carried out with connector resting on connector (see the diagrams below): Particular attention must be paid to the information on the nameplate in order to choose the correct type of connection for the supply voltage Direction of rotation When the motor is powered by U1, V1, W1 or 1U, 1V, 1W from a direct mains supply L1, L2, L3, it turns clockwise when seen from the drive end. If 2 phases of the power supply are changed over, the motor will run in an anti-clockwise direction (make sure the motor has been designed to run in both directions of rotation). Warning: motor with backstop: starting in the wrong direction destroys the backstop (see arrow on motor housing). If the motor is fitted with accessories (thermal protection or space heater), these should be connected on screw dominos or terminal blocks with labelled wires (see section 2.4). Temperature probe Tightening torque (N.m) on the terminal block nuts Terminal M4 M5 M6 M8 M10 M12 M14 M16 Steel Brass If using cables without connectors, attach some calipers. If any nuts on the brass terminal block are lost, they must be replaced by brass nuts, not steel ones. When closing the box, ensure that the seal is correctly positioned. As a general rule, check that no nut, washer or other foreign body has fallen into or come into contact with the winding Earth terminal This is situated inside the terminal box; in some cases, the earth terminal may be situated on one of the feet or on one of the cooling fins (round motors). It is indicated by the symbol: It is compulsory to earth the motor. Earthing must be performed in accordance with current regulations (protection of workers). * If required, this diagram should be obtained from the supplier, specifying the motor type and number (shown on the motor nameplate). Installation and maintenance - Three-phase induction motors 15

16 ROUTINE MAINTENANCE 3 - ROUTINE MAINTENANCE Checks after start-up After approximately 50 hours operation, check that the screws fixing the motor and the coupling device are still tight. In the case of chain or belt transmission, check that the tension is correctly adjusted. Cleaning To ensure the motor operates correctly, remove any dust or foreign bodies which might clog the cover grille and the housing fins. Precaution: before carrying out any cleaning operation check that the motor is completely sealed (terminal box, drain holes, etc). Dry cleaning (vacuuming or compressed air) is always preferable to wet cleaning. Always clean at reduced pressure from the center of the motor towards the extremities to avoid introducing dust and particles under the seals. Draining off condensation water Temperature variations cause condensation to form inside the motor, which must be removed before it adversely affects motor operation. Condensation drain holes, located at the bottom of the motors (bearing in mind their operating position) are sealed with plugs which must be removed and then replaced every six months (if they were not replaced, the motor degree of protection would no longer be maintained). Clean the orifices and plugs before reassembling them. Note: In conditions of high humidity and significant temperature variations, a shorter period is recommended. As long as it poses no risk to the motor protection, the condensation drain plugs can be removed Greasing Type of grease When the bearings are not greased for life, the type of grease is indicated on the nameplate. As standard this grease is Polyrex EM103 and we recommend that it is used for subsequent lubrication. Avoid mixing greases Permanently greased bearings For LS/LSES and FLS/FLSES 225 motors, the bearings defined offer long grease life and therefore lubrication for the lifetime of the machines. The grease life according to speed of rotation and ambient temperature is shown on the chart below. PERMANENTLY GREASED BEARINGS Under normal operating conditions, the service life (L 10h ) in hours of the lubricant is indicated in the table below for ambient temperatures less than 55 C. Series LS/LSES Type No. of poles Types of permanently greased bearing Grease life according to speed of rotation 3000 rpm 1500 rpm 1000 rpm N.D.E. D.E. 25 C 40 C 55 C 25 C 40 C 55 C 25 C 40 C 55 C 80 L CN 6204 C LG 2 ; C C SL/L 2 ; 4 ; LU C C L 2 ; 4 ; C C LR M C C MG 2 ; MU C C S 2 ; C C SU 2 ; SM/M 2 ; 4 ; C C MU 4 ; C C MR 2 ; C C MP 2 ; C C M/MU C C3 160 L 2 ; 4 ; LUR 4 ; C C MT 2 ; M C C L LR C C LUR 4 ; C C L 2 ; C C LR 2 ; 4 ; C C3 200 LU 4 ; ST C C3 225 MT SR C C MR 2 ; 4 ; SG C C MG 4 ; Note: on request, all motors can be fitted with grease nipples except the 132 S/SU. 16 Installation and maintenance - Three-phase induction motors

17 ROUTINE MAINTENANCE Series FLS/FLSES Type No. of poles Types of permanently greased bearing Grease life according to speed of rotation 3000 rpm 1500 rpm 1000 rpm N.D.E. D.E. 25 C 40 C 55 C 25 C 40 C 55 C 25 C 40 C 55 C 80 L CN 6204 C LG C C SL/L 2 ; 4 ; LU 2 ; C C L 2 ; LG 4 ; C C MG 2 ; MU C C SM/M 2 ; 4 ; C C MU 2 ; C C MR 4 ; C C M 2 ; 4 ; C C3 160 MU LUR 2 ; 4 ; C C M C C MT C C MUR C C L 4 ; C C LUR 4 ; C C LU 2 ; 4 ; C C S C C SR C C M 4 ; C C MR C C Note: on request, all motors can be fitted with grease nipples. Installation and maintenance - Three-phase induction motors 17

18 ROUTINE MAINTENANCE Bearings with grease nipples The bearings are lubricated in the factory The end shields are fitted with bearings lubricated by grease nipples such as Tecalemit-Hydraulic M8 x 125. Even in the event of prolonged storage or downtime, the interval between 2 greasing operations should never exceed 2 years. The frequency of lubrication and the quantity and quality of grease are given on the nameplates and these should be referred to in order to ensure correct bearing lubrication. Series Type 160 M/MU* 160 L* No. of poles Type of bearing for bearings with grease nipples Quantity of grease Greasing intervals in hours 3000 rpm 1500 rpm 1000 rpm N.D.E. D.E. g 25 C 40 C 55 C 25 C 40 C 55 C 25 C 40 C 55 C 2 ; 4 ; C C MR* MT* 2 ; C C LR* LUR* 4 ; C C M* C C L* LR* 2 ; 4 ; C C LU* 4 ; L* 2 ; C C LS/LSES 225 ST* C C MT* SR/MR* 2 ; 4 ; C C SG* C C MG* 4 ; MZ C C ME 4 ; C C SC/MC SC C C SD/MD 4 ; C C SN C C MP C C SP C C MP/MR 4 ; * bearing with grease nipple available to order 18 Installation and maintenance - Three-phase induction motors

19 ROUTINE MAINTENANCE Series FLS/FLSES Type No. of poles Type of bearing for bearings with grease nipples Quantity of grease Greasing intervals in hours 3000 rpm 1500 rpm 1000 rpm N.D.E. D.E. g 25 C 40 C 55 C 25 C 40 C 55 C 25 C 40 C 55 C 160 M* 2 ; 4 ; C C MU LUR* 2 ; 4 ; C C M* C C MT* C C MUR* C C L* 4 ; C C LUR* 4 ; C C LU* 2 ; 4 ; C C S* C C SR* C C M* 4 ; C C MR* C C M 2 ; C C MR S/M 2 ; 4 ; C C S/M/L C C S/M/L 4 ; C C L C C L 4 ; C C LK 4 ; C C L/LV 4 ; C C LK/ 450 L 4 ; C C * bearing with grease nipple available to order Series PLS/PLSES Type 225 MG 250 SF 250 MF No. of poles 2 ; MD SGU MGU SUR LUS SU MU 2 Type of bearing for bearings with grease nipples Quantity of grease Greasing intervals in hours 3000 rpm 1500 rpm N.D.E. D.E. g 25 C 40 C 55 C 25 C 40 C 55 C 6314 C C C C L C C LD C C LG/MGU 315 VLG/VLGU 355 L C C C C C C C C C C C C L C C * bearing with grease nipple available to order Installation and maintenance - Three-phase induction motors 19