Sollatek AVR 3X20 Mode D'emploi page 14

Page 26
In the large AVRs the main circuit boards are type ST165. There is one master PCB per phase and several slaves.
In the picture below of an AVR3x400, there is one master and 7 slave PCBs.
Pink/Grey fuse (in 7 Slave PCBs (ST165)
line on older units).
ST163 Resistor Reset LED (one
Triacs on
PCBs on every PCB)
heatsinks
Notes.
1. The Pink/grey wire brings low voltage ac from a small winding on the main transformer to power the circuit
boards. It connects first to one PCB, and then links to all the rest.
2. The ribbon cable takes the control signals from the maser PCB and links it to all the slave PCBs.
3. There are seven round input LEDs on each PCB. These should all be on the same position for the PCBs on any
one phase.
4. The Reset LED will only be on when the mains power is too low to operate the circuit boards correctly.
THREE PHASE AUTOMATIC VOLTAGE REGULATOR Issue: Feb 2002
Brass pillars
with sleeving
1 Master PCB
(ST165)
Neutral
Connection
Output LEDs
Micro
Input LEDs
Live-Out
Screw
Ribbon Cable
Pink/Grey Wires
THREE PHASE AUTOMATIC VOLTAGE REGULATOR Issue: Feb 2002
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
Page 27