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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
line on older units).
ST163 Resistor
Triacs on
PCBs
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: Jan 2016
7 Slave PCBs (ST165)
Reset LED (one
on every PCB)
Brass pillars
with sleeving
Pink/Grey Wires
1 Master PCB
(ST165)
Neutral
Connection
Output LEDs
Micro
Input LEDs
Live-Out
Screw
Ribbon Cable
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