INSTRUCTION MANUAL. I/P Converter DSG BXXY3Z DSG BXXY4Z

Transcription

1 INSTRUCTION MANUAL I/P Converter DSG BXXY3Z DSG BXXY4Z Revision en Page 1/15

2 Should you have any questions concerning the I/P converter, please contact the Service Department of the Product Group Electric Actuators and Controllers Voith Turbo GmbH & Co. KG, Crailsheim. Voith Turbo GmbH & Co. KG P.O. Box Crailsheim / Germany Switchboard: /32-0 Telefax No.: / Electric Actuators and Controllers: Direct dial No.: / Direct fax No.: / turbinenstelltechnik@voith.de Address for goods supplied: Voith Turbo GmbH & Co. KG ce Dept. Brunnenstr Crailsheim / Germany This Instruction Manual describes the technical condition of the: - I/P converter DSG-BXXY3Z and - I/P converter DSG-BXXY4Z for delivery from August 1999 Voith Turbo GmbH & Co. KG 1999 This Instruction Manual is protected by copyright. It is not allowed to be copied or translated by mechanical or electronic process as a whole or in parts, nor submitted to third parties without the publisher's written approval. Date of issue: 09/00 Order No.: en Revision: 2.0 Document No.: Printed in Germany en Page 2/15

3 Contents 1 Technical Data 2 Safety Information 2.1 Definition of symbols and notes 2.2 Use in accordance with regulations 2.3 General information 2.4 Warranty 3 Functional Description 3.1 Mechanical design 3.2 Operation 4 Transport and Storage 5 Installation and Connection 5.1. Hydraulic connection 5.2 Electric connection 6 Commissioning and Adjustments 6.1 Commissioning 6.2 Adjustments 7 Operation 7.1 Operation with manual operation knob 7.2 Operation with set signal 8 Switching-off 9 Servicing 10 Trouble-Shooting 11 Enclosures en Page 3/15

4 1 Technical Data Electric data: - Supply voltage 24 VDC (permissible range VDC, incl. residual ripple) - Rated power consumption 17.6 W - Max. power consumption 60 W - Setpoint input w = ma Coupled against 24 VDC and protected against overload. Max. permissible electric potential to 24 VDC and GND ± 50 V. Input resistor approx. 36 ohms with suppressor circuit. - Emergency switching-off At w < 2 ma, quick de-energizing of magnet coil. Result: PA 0 bar. At w > 3 ma, normal operation again. - Monitoring switching-off At f = 0 Hz (failure of control frequency), downward regulation to and memory of P A 0 bar. Reset by: w < 2 ma for t 1 ms or interruption of 24 VDC for t 2 ms - OK signal Output signals response of monitoring switching-off. (see chapter 11, outline drawings) - Types of protection IP65 to DIN40050 to EN Ex-protection EEx d IIC T4 to EN50018 Hydraulic data: - Pressure fluid mineral oil or hydraulic oil - Oil purity class Recommended purity class: to NAS1638 class 7 to ISO4406 class 16/13 - Input pressure (min.) 1,5 bar + P A (max.) - Leakage 4 l/min - Viscosity cst - Attenuation adjustable by closing max. 3 attenuation holes with set screws M3x5 in the magnet armature - Design free from non-ferrous heavy metal en Page 4/15

5 Type DSG- B05... B07... B10... B14... B20... B30... B35... Pressure regulating range P A [bar] Input pressure P(MAX) [bar] Flow rate Q P A [l/min] at P = 1 bar Flow rate Q A T [l/min] at P = 1 bar Regul. range approx P A (MAX) [bar] at setpoint 20 ma Regul. range approx P A (MIN) [bar] at setpoint 4 ma The regulating range of P A (MIN) depends on the set pressure P A (MAX). The regulating range for P A (MIN) indicated in the first line refers to the minimum adjustable pressure P A (MAX). Control characteristics: - Hysteresis 0.01 bar Dimensions and installation position: Please see chapter 11, outline drawings. Electric and hydraulic connection: Please see chapter 11, outline drawings. Ambient conditions: - Ambient temperature C - Shock resistance 50 g for s (total 18 impulses) - Vibration Hz at 4.2 g - Atmospheric humidity 100% condensing - Pressure fluid temperature C Weight: approx. 12 kg en Page 5/15

6 2 Safety Information 2.1 Definition of symbols and notes Danger! This symbol signals an imminent danger to the life and health of people. If this note is not observed, serious injuries may be the consequence. Warning! This symbol signals a harmful situation. If this note is not observed, the product may be damaged. Note This symbol refers to proper handling of the product. It does not refer to or indicate a dangerous situation. 2.2 Use in accordance with regulations The I/P converter serves to transform an electric set signal (e.g ma) to the relevant hydraulic pressure. This allows, for example, a continuous adjustment of the control piston or working piston. 2.3 General information Instruction Manual: The instruction manual contains important information for proper handling of the I/P converter. Prior to installation and commissioning of the I/P converter, read the manual carefully. Keep this instruction manual in a location convenient to the operating staff. Prevention of accidents / environmental protection: The I/P converter is an electro-hydraulic unit. In case of improper use, oil under pressure may leak out. In the event of improper mounting, connection or commissioning, the type of protection indicated will no longer be guaranteed. In addition to the instruction manual: Have the regulations for prevention of accidents and environmental protection available en Page 6/15

7 Staff: Only trained personnel is allowed to perform installation and commissioning. Please obligatorily observe the applicable standards and regulations when working on units with explosion protection. Constructional modifications: Construction modifications are allowed only with the approval of Voith Turbo, Crailsheim. 2.4 Warranty The terms and conditions mentioned in the General Conditions of Sale of Voith Turbo GmbH & Co. KG, Crailsheim, are applicable. Warranty claims are excluded if these are due to one or several of the following causes: Improper transportation, storage, set-up, commissioning, operation, maintenance and repair of the servomotor. Not observing the safety regulations and guidelines included in this instruction manual. Using spare parts not approved by Voith. Note! It is only allowed to perform repair work on the I/P converter after obtaining Voith Turbo GmbH & Co. KG, Crailsheim approval en Page 7/15

8 3 Functional Description 3.1 Mechanical design Picture control magnet P - input pressure 2 - tappet for power transmission P A - output signal pressure 3 - potentiometer X0 and X1 4 - manual operation knob T1 - tank return line 5 - electric connection T2 - tank return line 6 - control housing F Mag - magnetic force 7 - control piston F Hyd - hydraulic force 8 - cover en Page 8/15

9 3.2 Operation see picture A set signal w = ma generates a magnetic force F Mag in the control magnet the limits of which can be adjusted by means of the potentiometers X0 and X1 and which is then transmitted to the control piston via the tappet. The hydraulic force F Hyd being proportional to the output signal pressure P A acts against this force. When both forces are identical, the control piston is located in the "hydraulic centre position" shown and the output signal pressure P A corresponds to the set signal. The "hydraulic centre position" is the control piston position where this piston performs minimum oscillating movements in the area of the control edges P P A and P A T until the output signal pressure P A corresponds to the value set by F Mag. When increasing, for example, the set signal and thus F Mag from this condition, the control piston position changes so that the output P A is connected to the feed pressure P and P A is blocked to the tank return line T1. Now the pressure P A increases until the control piston returns to the "hydraulic centre position" and P A corresponds to the new set signal. Function of manual operation knob: The control magnet of I/P converter is provided with manual operation knob. With help of this manual operation knob, a spring force can be adjusted and set, instead of the magnetic force F Mag, which acts on the control piston via the magnet armature and tappet. The hydraulic force F Hydr. being proportional to the output signal pressure P A also acts against this spring force here. So the output signal pressure can be adjusted without electric connection. 4 Transport and Storage The outer surfaces of I/P converter are protected by means of a preserving surface coat. The inner parts are preserved by oil prior to shipment. This preservation ensures the I/P converter's protection against corrosion for a short storage under normal ambient temperatures. The I/P converter is shipped in a special packing. All holes are sealed by means of plugs or protective caps en Page 9/15

10 5 Installation and Connection Perform any connection and installation work on the I/P converter only when it is deenergized and the oil supply system is turned off. When removing the seals from the I/P converter, existing residual oil may leak out. Collect any oil leaking out in an appropriate receptacle. When assembling the piping, ensure that it is fastened to fixed structures, free from vibration and not to moving equipment. Temperature variations of the piping (thus alterations in length) should not apply external forces to the I/P converter. Fibrous or hardening sealing compounds, such as hemp or adhesive cement, must not be used. Prior to mounting the piping, clean them from dirt, scale, sand, chips etc. Pickle or flush welded pipes. After having mounted the piping and hose lines, clean and flush them thoroughly. Make sure that the I/P converter is not connected. Maximum cleanliness is imperative for all work. Prior to loosening unions, clean the external environment. Close all holes by means of protective caps. Make sure that impurities cannot enter the I/P converter or the piping. => For flushing, a flushing plate, art. No , is available. 5.1 Hydraulic connection The hydraulic connection on the I/P converter is made by means of connecting bores on the I/P converter bottom. Sealing is made by O-rings. Dimensions and position of connecting bores, please see chapter 11. => To connect the I/P converter to a piping system, adapters, art. No , and are available. 5.2 Electric connection Connecting wires to the I/P converter provided by the customer shall be screened lines. Connect the screens on the infeed point to the reference potential. Avoid that the connecting wires to the I/P converter run parallel to the wires of loadcommutated inverters. If an I/P converter with ex-protection is connected, observe the requirements stipulated in the relevant standards and regulations. Please refer to the outline drawings of chapter 11 with regard to the connecting diagrams en Page 10/15

11 6 Commissioning and Adjustments 6.1 Commissioning The I/P converter was adjusted and tested at Voith Turbo's works by means of the potentiometers X0 and X1. The test results as well as the parameters set are documented in an attached test certificate. The set potentiometers are provided with a protective cap to avoid any unintentional maladjustment. Observe the following on commissioning of the I/P converter: Check the line mounting, connection and flow direction to and on the I/P converter. Check the electric connection of I/P converter. Check the oil cleanliness. Specified oil cleanliness, see chapter 1: Technical Data. Impurities in the oil reduce the service life and reliability of the hydraulic components used and also impair the control behaviour of I/P converter. Switch on the 24 VDC power supply. Switch on the oil supply. Set the signal ma and check the output signal pressure. Now commissioning is complete. 6.2 Adjustments With help of the potentiometers X0 and X1, the pressure range can be easily adjusted to the respective requirements within the limits indicated in chapter 1. When doing so, observe that X1 should be adjusted before X0. Adjustment of max. output signal pressure: During this adjustment and on operation, make sure that the input pressure exceeds the set output signal pressure at 20 ma by approx. 1.5 bar en Page 11/15

12 At a set signal of 20 ma, adjust the potentiometer X1 so that the max. output signal pressure is on the I/P converter output. Direction of control action: Pressure increase by turning the potentiometer X1 clockwise (cw). Adjustment of minimum output signal pressure: At a set signal of i=4ma, adjust the potentiometer X0 so that the min. output signal pressure is on the I/P converter output. Direction of control action: Pressure increase by turning the potentiometer X0 clockwise (cw). 7 Operation 7.1 Operation with manual operation knob Operation with manually controlled rotary knob is possible without electric energy. On operation with manually actuated rotary knob, uncontrolled stroke movements of the hydraulic components controlled by the I/P converter output might produce due to the increase in the output signal pressure. Operation with manual operation knob is only possible when the circlip is removed from the manual operation knob. On completion of operation with manual operation knob, move the manual operation knob in its final position by turning it counterclockwise and pushing in the circlip to its final position. How to adjust the output signal pressure: Remove the circlip. Slowly adjust the manual operation knob and observe the output signal pressure. Direction of control action: Pressure increase on the I/P converter output by clockwise (cw) rotation. 7.2 Operation with set signal Operation with set signal is only possible after having turned the manual operation knob counterclockwise in its final position and pushing in the circlip to its final position. When the supply voltage is switched on, the output signal pressure can be adjusted continuously by the set signal ma, within the limits set by the potentiometers X0 and X en Page 12/15

13 8 Switching-off If an I/P converter is switched off for reasons of repair or unit shutdown, proceed as follows: Switch off the oil supply system and reduce the pressure in the existing accumulators if necessary. Switch off the 24VDC supply voltage and the set signal. Clean the I/P converter, location of installation and particularly the area around the installation surface of the hydraulic component. Remove the I/P converter and collect the residual oil leaking out of the piping and I/P converter. Close all holes on the hydraulic component and pack the I/P converter carefully and with clean material to avoid any damage, in particular of the electric connections. In the event of a possible disposal of I/P converter, observe the local applicable regulations regarding the environmental protection. The I/P converter contains: synthetic materials copper electronic components residual oil 9 Servicing For a trouble-free and reliable operation of the I/P converter, it is necessary to perform supervision, maintenance and repair work in certain intervals. Continuous monitoring: Monitoring of lines, unions and connections on the I/P converter with regard to leakage, impurities and damage. Eliminate any leakage, impurity and damage noticed, if required, during appropriate operating modes. Monitor the I/P converter's control behaviour for any changes. Analyse and eliminate the causes, if required, during appropriate operating modes. Monitoring after approx. 740 operating hours, max. one / month: Take an oil sample from the oil tank and analyse for impurities by solid and suspended matters, water content, discolouration and air bubbles. Check the oil sample cleanliness. If required, clean or change the oil during an appropriate operating mode. Monitoring after approx operating hours, max. one / year: en Page 13/15

14 Take an oil sample from the oil tank and analyse it chemically. If required, clean or change the oil during an appropriate operating mode. Check and retighten, if necessary, the I/P converter's electric connections. 10 Trouble-Shooting Malfunction: Pressure variations Cause: low or considerably varying input pressure Under load and in particular in case of a higher output signal pressure, a lower input pressure may lead to pressure variations. Remedy: Increase and/or stabilise the input pressure by taking appropriate measures (e.g. accumulator). See also chapter 6.2. Malfunction: Pressure variations Cause: air inclusion in the I/P converter On first commissioning, air inclusion may lead to output pressure variations. Remedy: By means of changing the set signal periodically (approx. 0.5 Hz) by +/- 6 ma over a few minutes, the air in the anchor chamber of control magnet escapes. Malfunction: Pressure variations Cause: dirt particles in the hydraulic component On first commissioning or after longer operation with a contaminated oil, dirt particles might get inside the I/P converter thus impairing the control piston function due to increased abrasion. Remedy: Open the hydraulic component and clean the inner elements. Examine the inner elements and replace them in case of damage en Page 14/15

15 Malfunction: Output signal pressure P A 0bar Cause: monitoring system causes shutdown Shutdown by the monitoring system can be recognized only if the OK signal is evaluated in accordance with the connecting diagram. Remedy: If the malfunction cannot be remedied by the reset described in chapter 1, please try to adjust the output signal pressure with help of the manually controlled rotary knob. If the pressure can be adjusted by the manually controlled rotary knob, the control magnet is defective and the I/P converter needs to be replaced by new one or repaired. If the pressure cannot be adjusted by the manually controlled rotary knob, please check the input pressure. 11 Enclosures Outline Drawing (normal design without hydr. attenuation) Outline Drawing (ex-protected design without hydr. attenuation) Outline Drawing (normal design with hydr. attenuation) Outline Drawing (ex-protected design with hydr. attenuation) Flushing plate Adapter Adapter Adapter en Page 15/15

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