THEORY OF OPERATION
4-6
Versapulse Select Service Manual
0621-499-01 01/94
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Shortly after the pump begins running the water flow switch SW3 will close, allowing K2 to energize. Once
K2 is energized the main contactor hold on loop is complete, and the main contactor will remain energized
with the release of the keyswitch from the START position to the ON position. Note that if the keyswitch is
released to the ON position before K2 energizes, the system will turn off.
The interlocked design of the turn-on circuitry prevents re-starting of the system without the user re-starting
with the keyswitch.
4.2.4 Shutdown
Refer to 8-2. The system will turn off if any of the following occur.
Keyswitch moved to OFF position
Emergency Off button pressed
Turn off or trip of main circuit breaker
Blown F1 or F2 line fuse
Blown F3
Open T1 thermal switch
Front door opened (intermock switch)
Loss of coolant flow
Loss of facility power
4.2.5 Low Voltage Power Supplies
Refer to 8-3. A vendor supplied low voltage power supply provides +5 VDC, ±12 VDC, and +24 VDC for use
throughout the system. It operates from the 220 VAC supply voltage from the secondary of T1. A 250V 5
amp fuse is mounted on the power supply. The 5 VDC and ±12 VDC lines are routed to the CPU PCB. The
24 VDC is routed to the CPU PCB and Shutter PCB. From the CPU PCB the 5 VDC supply is routed out to
the touch screen display, remote control and Shutter PCB.
The vendor supplied HVPS includes a +15 VDC voltage output that is used on the HVPS side of the isolation
circuits of the CPU PCB (U8, U9, U11, U99, U100, U48, U47, U41, U101, U13, U14).
CPU PCB U60 is a voltage regulator that develops a 5 VDC supply (5V ENCOD) for the Servo Motor PCB.
12/95
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