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THREE PHASE AUTOMATIC VOLTAGE REGULATOR Issue: Jan 2016
AVR on-site repair guide
Power PCB replacement procedure (Single PCB per Stack)
Ensure the AVR is isolated from the supply and load before commencing
1. Remove neutral sense cable (Single cable connected to J5)
2. Remove ribbon cable (connected to J2) if fitted.
3. Remove Pink/Grey cables (twisted pair to J6)
4. The PCB is fixed to the metalwork by means of 7 screws into nylon pillars. Removing these gives access to the
back of the PCB.
5. Undo the 8 nuts/bolts securing the transformer connections to the rear of the PCB. NB - the order in which
these cables are connected should be noted for replacement. The Correct cable colour connections are
marked
on the PCB.
6. Remove faulty PCB. Ensure that the replacement PCB is exactly the same type as the removed PCB ie slave,
master, 3 way, 5 way etc.
7. Fitting replacement PCB is a reversal of the above procedure.
8. It is essential that the On Site AVR Test Procedure following Maintenance/Repair for replaced power PCBs is
followed before the AVR is put back on-line.
Power PCB replacement procedure (Multiple PCBs per Stack – see Photo)
Ensure the AVR is isolated from the supply and load before commencing
1. Remove front PCB neutral sense cable (Single cable connected to J5)
2. Remove front PCB ribbon cable (connected to J2)
3. Remove Pink/Grey cables (twisted pair to J6)
4. The front PCB is fixed to those behind by hexagonal brass pillars and nuts. To remove the the front PCB
remove these nuts.
5. The same procedure should be repeated until the faulty board is outermost.
6. Replace faulty PCB. If this is the PCB with the transformer cables attached then the above procedure for single
PCB per stack should be followed here. Ensure that the replacement PCB is exactly the same type as the
removed PCB ie slave, master, 3 way, 5 way etc.
7. Re-assembling the PCB stack is the reverse of this procedure.
8. It is essential that the On Site AVR Test Procedure following Maintenance/Repair for replaced power PCBs is
followed before the AVR is put back on-line.
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