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THREE PHASE AUTOMATIC VOLTAGE REGULATOR Issue: Jan 2016
5. DSP replacement procedure
Ensure the AVR is isolated from the supply and load before commencing
1. Remove AVR back panel by undoing securing screws.
2. Remove cable access cover by undoing securing screws. The screws are covered by plastic inserts which must
be removed.
3. Remove cables from terminals, noting cable order.
4. Pull cables out of DSP case.
5. Remove DSP from AVR by undoing two securing screws in cable access area.
6. Lift DSP off rear of AVR.
7. To fit new DSP, reverse the above procedure.
8. Test according to instructions in AVR Site Test Procedure
9. Replace back panel
Meter PCB replacement procedure
Ensure the AVR is isolated from the supply and load before commencing
1. Undo fixing nuts on rear of faulty meter PCB.
2. Remove PCB gently and disconnect ribbon connector.
3. Fit ribbon connector on replacement PCB.
4. Set replacement PCB in place on studs and replace nuts.
5. Ensure jumper on rear of PCB is set to the same setting as the removed PCB.
6. Test according to instructions in AVR Site Test Procedure.
7. If new meter PCB is out of adjustment, it can be re-calibrated using P1 on rear of replaced PCB. P1 should be
adjusted until displayed voltage agrees with measured voltage.
AVS PCB replacement procedure
Ensure the AVR is isolated from the supply and load before commencing
1. On certain AVR models it will be necessary to remove the rear panel to access the AVS PCB.
2. Note all wiring colours and positions and AVS settings.
3. Remove all wiring.
4. Remove PCB by undoing screws
5. Place replacement PCB in position and fix.
6. Replace wiring in the same order as previously connected.
7. Ensure all voltage and delay setting knobs are set to the same positions as they were on the old PCB.
8. Test according to instructions in AVR Site Test Procedure
9. Replace back panel
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