Service Information

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Product InformatIonIntroductionService Information S225-60-7 provides instructions to free a tap-changer stalled between positions with the holding switch closed.

Refer to S225-10-30, VR-32 Voltage Regulator with Quik-Drive Tap-Changer Installation, Operation, and Maintenance Instructions and S225-11-1, CL-6 Series Control Installation, Operation, and Maintenance Instructions for detailed service information on Cooper Power Systems voltage regulators and controls.

read this manual firstRead and understand the contents of this manual and follow all locally approved procedures and safety practices before installing or operating this equipment.

additional InformationThese instructions cannot cover all details or variations in the equipment, procedures, or processes described nor provide directions for meeting every possible contingency during installation, operation, or maintenance. For additional information, contact your Cooper Power Systems representative.

StandardsISO 9001 Certified Quality Management System

Procedure InStructIonS 1. To determine if the tap-changer is stalled between

tap positions with the holding switch closed, check the voltage on the L1 or R1 terminals on the back panel. This is done by touching one lead from an AC voltmeter to ground and the other to either L1 or R1. Whichever position reads approximately 120 volts is the direction the tap-changer was moving when stalling occurred. Note there will, in all likelihood, be a floating capacitive voltage on the other direction. Record this voltage level. Once it has been determined that the tap-changer is stalled, the following steps can be used to reverse the direction of the tap-changer to free the mechanism.

2. Place the Auto/Remote/Manual switch into the OFF position.

3. Place the Internal/External switch into the OFF position.

4. Close the C (CT) shorting switch on the back panel of the control.

5. Open the V1 disconnect switch on the back panel of the control, removing power from the control.

6. Disconnect the orange wiring harness lead from the HS terminal on the bottom of terminal board (TB1) that is located on the back panel of the control, thus removing power from the tap-changer holding switch.

7. Close the V1 disconnect switch.

8. Place the Internal/External power switch on Internal.

9. Place the Auto/Manual switch on Manual.

10. Jog the Raise/Lower switch in the direction the capacitive voltage was observed. This should allow the tap-changer to free itself. Using the Raise/Lower switch run the tap-changer one or two steps. Inspect the position indicator to verify that the indicating pointer is directly over a tap position mark. If the pointer is not directly over a tap position mark, jog the Raise/Lower switch in the same direction as done previously. This should put the pointer in the correct position.

11. Place the Auto/Manual switch on OFF.

12. Place the Internal/External power switch into the OFF position.

13. Open V1 disconnect switch.

14. Reconnect the orange lead to the HS terminal restoring power to holding switch.

Voltage regulators

Procedure to free a Stalled tap-changer S225-60-7

1011 • Replaces R225-60-7 0101

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Procedure to Free a Stalled Tap-Changer

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The instructions in this manual are not intended as a sub stitute for proper training or adequate experience in the safe operation of the equipment described. Only competent technicians, who are familiar with this equipment should install, operate and service it.

A competent technician has these qualifications:n Is thoroughly familiar with these instructions.n Is trained in industry-accepted high- and low-voltage

safe operating practices and procedures.n Is trained and authorized to energize, de-energize, clear,

and ground power distribution equipment.n Is trained in the care and use of protective equipment

such as flash clothing, safety glasses, face shield, hard hat, rubber gloves, clampstick, hotstick, etc.

Following is important safety information. For safe installation and operation of this equipment, be sure to read and understand all cautions and warnings.

Safety InstructionsFollowing are general caution and warning statements that apply to this equipment. Additional statements, related to specific tasks and procedures, are located throughout the manual.

danGer: Hazardous voltage. Contact with high voltage will cause death or severe personal injury. Follow all locally approved safety procedures when working around high- and low-voltage lines and equipment.

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WarnInG: Before installing, operating, maintaining, or testing this equipment, carefully read and understand the contents of this manual. Improper operation, handling or maintenance can result in death, severe personal injury, and equipment damage.

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WarnInG: This equipment is not intended to protect human life. Follow all locally approved procedures and safety practices when installing or operating this equipment. Failure to comply may result in death, severe personal injury and equipment damage.

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WarnInG: Power distribution and transmission equipment must be properly selected for the intended application. It must be installed and serviced by competent personnel who have been trained and understand proper safety procedures. These instructions are written for such personnel and are not a substitute for adequate training and experience in safety procedures. Failure to properly select, install or maintain power distribution and transmission equipment can result in death, severe personal injury, and equipment damage.

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SafetY for LIfeCooper Power Systems products meet or exceed all applicable industry standards relating to product safety. We actively promote safe practices in the use and maintenance of our products through our service literature, instructional training programs, and the continuous efforts of all Cooper Power Systems employees involved in product design, manufacture, marketing and service.

We strongly urge that you always follow all locally approved safety procedures and safety instructions when working around high-voltage lines and equipment and support our “Safety For Life” mission.

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SafetY InformatIon

This manual may contain four types of hazard statements:

danGer: Indicates a hazardous situation which, if not avoided, will result in death or serious injury.

WarnInG: Indicates a hazardous situation which, if not avoided, could result In death or serious injury.

cautIon: Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

cautIon: Indicates a hazardous situation which, if not avoided, could result in equipment damage only.

Hazard Statement definitions

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S225-60-7

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15. Close the V1 disconnect switch.

16. Open the CT shorting switch.

17. Place the Internal/External power switch on Internal.

18. Turn Auto/Remote/Manual control switch to Manual.

19. Using the Raise/Lower switch step the regulator to the neutral position.

20. Before de-energizing the regulator by bypassing to remove from the system, verify that the regulator is truly in the Neutral Position. It is recommended that a minimum of four (4) checks are performed to confirm that the voltage regulator is in the neutral position: 1) The neutral light remains on continuously; 2) the position indicator points directly at zero; 3) the control panel neutral indication viewed at Function Code 12 reads zero; 4) a voltage measurement between the S and L bushing measured using voltmeter test equipment indicates no differential voltage. Refer to S225-10-30, VR-32 Voltage Regulator with Quik-Drive Tap-Changer Installation, Operation, and Maintenance Instructions and S225-11-1, CL-6 Series Control Installation, Operation, and Maintenance Instructions for detailed service information on Cooper Power Systems voltage regulators and controls. Carefully read the instruction in the appropriate voltage regulator manual regarding removing a regulator from service.

Procedure to Free a Stalled Tap Changer

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S225607 Rev. 0 (Replaces R225607 Rev. 0)

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