Ulvac C30MVER, Installation, Operation, Maintenance And Troubleshooting Instructions

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C30VR Compressor Installation, Operation, Maintenance and Troubleshooting
Signal functions only for Momentary operating mode
COMP START
（
Compressor start
）
The compressor pump starts operation by turning this command signal ON for a short
period of time and the compressor keeps the operation status. Turn the command signal
ON for more than 0.3 second. (Refer to the description of
COMP STOP below).
For C30VR, when the compressor pump starts operation, the refrigerator starts at the
same time.
For C30MVR, command signals for refrigerators
（ CH1 REF, CH2 REF, CH3 REF ） should
be turned ON to start the refrigerators.
COMP STOP
（
Compressor stop
）
This is a paired signal with COMP START .
Use this signal to stop the compressor pump and refrigerator. Turn the command signal
OFF for longer than 0.3 seconds and the compressor pump and all refrigerators will stop
and keep the status.
Keep the signal ON unless you need to stop operation. To stop operation by this signal,
COMP START signal must be turned OFF beforehand. However leave this signal ON
when to turn ON COMP START signal.
Signal functions only for Alternate operating mode
COMP ON/OFF
（
Compressor start/Stop
）
With Alternate operating mode, turning this signal ON starts operation of the compressor
pump and OFF stops all the refrigerators and the compressor.
With C30VR, when the compressor pump starts operation, the refrigerator starts operation
at the same time.
With C30MVR, the command for refrigerators
（
CH1REF,CH2REF,and CH3REF) should
be turned ON as well as this signal.
Signal functions for both operating modes
CH1 REF, CH2 REF, CH3 REF
（
Refrigerators No.1-3 start/stop
）
These signals are required for C30MVR only.
Use the command signals CH1REF
～
CH3REF at the equipment side depending on how
many refrigerators are used. While the compressor pump is in operation, to start the
refrigerator(s) turn ON the corresponding signal (either CH1REF
，
CH2REF, CH3REF, or
all ） . Turn OFF the signals and the refrigerator stops operation.
When the compressor pump is not in operation, it will not return the answer back signal
(
CH* ACK ) even if this signal ( CH* REF ) is turned ON.
Note: For the operation after a short power interruption, refer to “Section 2.6.6 Signal
timing charts – Operation after a short power interruption”.
2-10 ULVAC CRYOGENICS INCORPORATED