SECTION MOTOR CONTROL
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1 SECTION MOTOR CONTROL PART 1 - GENERAL 1.1 SECTION INCLUDES A. Manual motor starters B. Magnetic motor starters C. Combination magnetic motor starters D. Solid-state reduced voltage motor starters (soft starters) 1.2 REFERENCES A. NEMA ICS 6 - Enclosures for Industrial Controls and Systems B. FS W-C Circuit Breakers, Molded Case; Branch Circuit and Service C. FS W-P Power Distribution Panel D. FS W-F Fuseholders (For Plug and Enclosed Cartridge Fuses) E. FS W-S Switch, Box, (Enclosed), Surface-Mounted F. NEMA AB 1 - Molded Case Circuit Breakers G. NEMA ICS 2 - Industrial Control Devices, Controllers, and Assemblies H. NEMA KS 1 - Enclosed Switches I. NEMA PB 1 - Panelboards J. NEMA PB Instructions for Safe Installation, Operation and Maintenance of Panelboards Rated 600 Volts or less K. ANSI/UL Standard 508. Standard for Industrial Control Equipment L. IEEE Standard Guide for Harmonic Control and Reactive Compensation of Static Power Converters M. FCC Rules and Regulations, Part 15, Subpart J- Radio Frequency Interference 1.3 SUBMITTALS A. Submit shop drawings and product data under provisions of Section B. Indicate on shop drawings, front and side views of motor control center enclosures with overall dimensions. Include conduit entrance locations and requirements; wiring diagrams that differentiate between manufacturer-installed and field-installed wiring; nameplate legends; size and number of bus bars per phase, neutral, and ground; electrical characteristics including voltage, frame size and trip ratings, withstand ratings, and time-current curves of all equipment and components. C. Provide product data on motor starters and combination motor starters, relays, pilot devices, and switching and over-current protective devices. KJWW #
2 D. Submit manufacturer's instructions under provisions of Section OPERATION AND MAINTENANCE DATA A. Submit operation and maintenance data under provisions of Section B. Include spare parts data listing; source and current prices of replacement parts and supplies; and recommended maintenance procedures and intervals. 1.5 DELIVERY, STORAGE, AND HANDLING A. Deliver products to site under provisions of Section B. Deliver in 60 inch maximum width shipping splits, individually wrapped for protection, and mounted on shipping skids. C. Store and protect products under provisions of Section D. Store in a clean, dry space. Maintain factory wrapping or provide an additional heavy canvas or heavy plastic cover to protect units from fumes, dirt, water, construction debris, traffic, and physical damage. E. Handle in accordance with manufacturer's written instructions. Lift only with lugs provided for the purpose. Handle carefully to avoid damage to motor control center components, enclosure, and finish. 1.6 SPARE PARTS A. Keys: Furnish four (4) each to the Owner. B. Fuses: Furnish three (3) spare fuses of each type and rating installed to the Owner. C. Fuse Pullers: Furnish one (1) fuse puller to the Owner. PART 2 - PRODUCTS 2.1 MANUAL MOTOR STARTERS A. Manual Motor Starter: NEMA ICS 2; AC general-purpose Class A manually operated non-reversing full-voltage controller for induction motors rated in horsepower, with overload relay, and toggle operator. B. Fractional Horsepower Manual Starter: NEMA ICS 2; AC general-purpose Class A manually operated, full-voltage controller for fractional horsepower induction motors, with thermal overload unit, and toggle operator. C. Motor Starting Switch: NEMA ICS 2; AC general-purpose Class A manually operated, full-voltage controller for fractional horsepower induction motors, without thermal overload unit, and toggle operator. D. Enclosure: NEMA ICS 6; Type 1. KJWW #
3 2.2 MAGNETIC MOTOR STARTERS A. Magnetic Motor Starters: NEMA ICS 2; AC general-purpose Class A magnetic controller for induction motors rated in horsepower. B. Full Voltage Starting: Non-reversing type, unless otherwise indicated. C. Reduced Voltage Starting: Closed-circuit transition wye-delta type: NEMA ICS 2, closed transition with adjustable time delay. D. Two Speed Starting: Two speed, one winding, variable torque type. NEMA ICS 2, closed transition with separate overload relays for starting and running sequences. E. Coil Operating Voltage: 120 volts, 60 Hertz, obtained from integral control power transformer of sufficient capacity to operate connected pilot, indicating, and control devices, plus 100% spare capacity. F. Size: NEMA ICS 2; size as shown on the drawings. G. Overload Relay: 1. Adjustable Overload Relay: Dip switch selectable for motor running overload protection with NEMA ICS 2, Class 20 tripping characteristic, and selected to protect motor against voltage and current unbalance and single phasing. Provide relay with Class II ground-fault protection, with start and run delays to prevent nuisance trip on starting. H. Enclosure: NEMA ICS 6; Type 1. I. Combination Motor Starters: Combine motor starters with disconnect switch in common enclosure. Provide with disconnecting means as indicated on drawings. J. Auxiliary Contacts: NEMA ICS 2; two normally open, field convertible contacts in addition to seal-in contact. K. Indicating Lights: NEMA ICS 2; RUN: red in front cover. L. Selector Switches: NEMA ICS 2; HAND/OFF/AUTO, in front cover. M. Relays: NEMA ICS 2; 1 N.C. I.N.O. N. Control Power Transformers: 120 volt fused secondary, fused primary, minimum VA as scheduled: Size VA Size VA Size VA Size VA Size VA Size VA O. Provide phase loss protection relay with contacts to de-energize the starter for each starter serving motors 5 HP or greater. KJWW #
4 2.3 SOLID-STATE REDUCED VOLTAGE MOTOR STARTERS (SOFT STARTERS) A. Soft Starters: ANSI/UL Standard 508. Used with NEMA Design B, AC induction motors to reduce in-rush current and mechanical shocks associated with starting and stopping motors. B. Operation: The soft starter shall utilize a thyristor (SCR) bridge to control the starting and stopping of the motor. A microprocessor shall monitor the current and control the phasing of the SCRs. The soft starter shall provide torque control for linear acceleration without external feedback independent of motor load or motor application. C. Torque ramp: Adjustable (by keypad) from 1 to 60 seconds. D. Shorting Contactor: A shorting contactor shall be supplied with all soft starters rated above 40 amps. The shorting contactor shall close after the current is below 130% of motor full-load amps at the nominal voltage. The shorting contactor shall open on a stop command to allow a deceleration ramp, if applicable. E. Status & Diagnostics: Door-mounted keypad for display of soft starter, motor, and fault statuses. F. Motor Protection against Solid-State Component Failure: Provide an isolation contactor that opens when the motor is stopped or when the controller detects a fault condition such as a shorted thyristor. G. Over-Current Protection Device / Power Disconnect: Integral molded case disconnect switch and in-line fuse block for RK type power fuses (up to 600 amps). Short circuit current rating shall be 65,000 AIC minimum or as indicated on drawings. H. Overcurrent Condition: The soft starter shall be capable of supplying 300% of rated full load current for 30 seconds at maximum ambient temperature. I. Electronic Protective Features: Thermal overload protection, phase reversal protection, stall protection, locked rotor protection, and underload protection. The display shall also indicate a starter thermal fault, phase fault, frequency fault, external fault, maximum start time exceeded, serial link fault, and internal failure. J. Controls: The control circuitry shall be fed internally from the line supply, completely independent of the power circuit and separate from the control logic. The control circuitry shall operate at 120 VAC via an integral control power transformer. K. Selector Switches: NEMA ICS 2; HAND/OFF/AUTO, in front cover. L. Input: Remote control start/stop signal, and one logic input for force to freewheel, indication of external fault, force to local control, or remote overload reset. M. Outputs: Isolation contactor status, torque ramp status, overload pre-alarm, fault alarms, and one field convertible auxiliary contact. One analog output shall be available for 4-20mA indication of motor current, torque, thermal state, or power factor. N. Current and Horsepower Ratings: As indicated in the Starter/Disconnect Schedule on the drawings. O. Input/Output Voltage: As indicated in the Starter/Disconnect Schedule on the drawings. The controller shall be capable of operating between -15% to +10% of nominal voltage rating. KJWW #
5 P. Environmental Characteristics: Ambient Air Temperature: 0 C to 40 C; Maximum Relative Humidity: 93% (non-condensing); Minimum Elevation without Derating: 3300 feet. Q. Enclosure: NEMA ICS 6; Type 1, with provisions for padlocking the door. 2.4 CONTROLLER OVER-CURRENT PROTECTION AND DISCONNECTING MEANS A. Fusible Switch Assemblies: NEMA KS 1, quick-make, quick-break, load interrupter enclosed knife switch with externally operable handle. Provide interlock to prevent opening front cover with switch in ON position. Handle lockable in OFF position. Fuse Clips: Provide with Class' R' rejection clips. Select and size fuses to provide Type 2 protection according to IEC , as certified by a nationally recognized testing laboratory. PART 3 - EXECUTION 3.1 INSTALLATION A. Install motor control equipment in accordance with manufacturer's instructions on concrete bases. B. Install fuses in fusible switches. C. Select and install heater elements in motor starters to match installed motor characteristics. D. Set field-adjustable switches and circuit-breaker trip ranges. E. Motor Data: Provide neatly typed label inside each motor starter enclosure door identifying motor served, nameplate horsepower, full load amperes, code letter, service factor, and voltage/phase rating. F. Coordinate size and location of concrete bases. Cast anchor-bolt inserts into bases. END OF SECTION KJWW #
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