Moveable contacts
●
●
Run the tap-changer through all positions checking for
proper alignment with stationary contacts.
●
●
Replace excessively worn contacts.
●
●
Signs of arcing indicate a malfunctioning vacuum
interrupter or tap changer mechanism.
Reversing switch contacts and mechanism
●
●
Run the tap-changer between neutral and position 1
Lower checking for proper alignment with stationary
contacts.
●
●
Inspect contacts for wear.
●
●
Inspect mechanisms for damage.
Stationary contact board and moveable contact arms
●
●
Inspect for build-up of carbon on surfaces; wipe off any
build-up with a rag.
●
●
Inspect for signs of arcing or heat damage.
General
●
●
Inspect for any signs of arcing between contacts, contact
boards, brackets, tap-changer mechanisms, and any other
components inside the tank.
●
●
Check hardware for tightness.
●
●
Check the reactor tie-rods for tightness.
●
●
Inspect the core and coil for insulation damage and heat
damage.
●
●
Remove any loose debris.
●
●
Evaluate an insulating fluid sample
Position indicator drive mechanism
●
●
Check the position-indicator linkage on the motor drive for
signs of damage or loose parts.
●
●
Check the drive cable for damage and signs of corrosion
1,000,000 operation maintenance
General
●
●
Replace the vacuum interrupter and bypass contacts.
●
●
Repeat 500,000-operation inspection for all other
contacts and replace contacts as necessary.
●
●
Repeat the 500,000-operation inspection for all other
components.
●
●
Inspect the tap changer mechanism and motor drive unit
for worn components including bearings, cams, pins, and
microswitches. Replace worn components.
Duty Cycle Monitor (DCM)
This feature is not available for the EVER-Tap voltage
regulator.
Operational check
Proper operation of the regulator can be checked without
removing the unit from service.
To perform an operational check:
1. Place the CONTROL FUNCTION switch in LOCAL
MANUAL.
2. Manually run the regulator several steps in the raise
direction until the OUT-OF-BAND HIGH LED illuminates
continuously.
3. Place the CONTROL FUNCTION switch in AUTO/
REMOTE. After the time delay expires, the regulator
should return to within the band edge and the OUT-OF-
BAND HIGH LED should go out.
4. Again place the CONTROL FUNCTION switch in LOCAL
MANUAL.
5. Manually run the regulator several steps in the lower
direction until the OUT-OF-BAND LOW LED illuminates
continuously.
6. Place the CONTROL FUNCTION switch in AUTO/
REMOTE. After the time delay expires, the regulator
should return to within the band edge and the OUT-OF-
BAND LOW LED should go out.
7. If the operations check does not complete successfully,
review the troubleshooting section of this manual
and refer to Service Information MN225003EN,
CL-7
Voltage Regulator Control Installation, Operation, and
Maintenance
, for more instructions.
8. If further assistance is required, contact Voltage
Regulator Support at (866) 975-7347. International
callers should call (262) 896-2591.
25
VR-32 and EVER-Tap™ Voltage Regulator
InstallatIon, operatIon, and MaIntenance InstructIons
MN225008EN June 2020
