4-28 888-2406-002
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
4.5.2.2.5Low Voltage Supply Regulators
U1, U3 and U4 regulate the voltages from the Low Voltage Supply down to 7.1Vdc,
+20Vdc and -20Vdc respectively. These voltages are sent to the controller where
they will be distributed to the individual controller boards. Input voltages to these
regulators will vary depending on the AC mains voltage.
4.5.2.2.616VCT, V+SCR Supply
The 16VCT secondary winding is fused by F3 and F4 on the Rectifier Board. These
are self-resetting fuses which physically look like disc capacitors. The AC is
rectified by CR10 and CR11 and becomes V+SCR which is the gate drive signal for
the tap and soft start SCRs.
4.5.2.2.7Heat Sink Temperature
The temperature of the rectifier heatsink is monitored by Thermistor, RT1. A fault is
triggered if the temperature of the rectifier heatsink exceeds 100°C and the power
supply will be shut off. This temperature can be monitored in the Status Menu of the
Diagnostics Display. If the thermistor is shorted, the temperature reading will be
about 155°C or higher and the supply shut off. If it is open it will cause a Thermistor
Fault to show up in the fault log.
4.5.3 Power Supply ID Jumpers
The 3 Phase and Single Phase supplies both have ID jumpers which are set to
designate the power supply as PS1 (or PS2 for optional Dual Supply system). This
lets the PS Controller know which power supply it is connected to, for proper
reporting to the Master Controller. The PS Controller will not allow 2 ID’s to be the
same. The jumper configurations are given below. These jumpers are located on the
Rectifier Boards on both the 3 Phase and Single Phase supplies.
PS#1 PS#2 PS#3 PS#4
JP1 IN OUT IN OUT
JP2 OUT IN IN OUT
JP3 OUT OUT OUT IN
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