C30HVRT Compressor Instruction Manual
COMP STOP（Compressor stop）
This is a paired signal with COMP START.
Use this signal to stop the compressor pump and cryocooler. Turn the command signal
OFF for longer than 0.3 seconds and the compressor pump and all cryocoolers will stop
and keep the status.
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 cryocoolers and the compressor.
With C30HVRT, when the compressor pump starts operation, the cryocooler starts operation
at the same time.
CAUTION
Please contact us when controlling the temperature of super trap is required
Do not turn on and off the compressor to control the temperature of super trap.
If the Compressor gets so many start-stop operations in a short period, it may cause the
Compressor failure such as the compressor motor life to be shortened extremely.
Switching between ON and OFF should be less than 6 times per hour, and ON and/or OFF
condition should be maintained longer than 5 seconds.
Do not switch between ON and OFF frequently.
Signal functions for both operating modes
COM
Each input “COM” line works as a return line of a corresponding control signal. It is
recommended to twist the signal line and the “COM” line together.
Also, output signal wires mentioned below should be twisted as a paired signal.
(e.g., CH1 ACK1 - CH1 ACK2)
COMP RUN（Compressor answer-back）
This is an answer-back signal responding to the compressor pump operation command.
When the compressor starts operation, the answer-back signal is sent to the equipment.
Note: Refer to “Section 2.5.6 Signal timing charts –Answer-back signal delay” as well.
ALARM（Alarm）
When this signal is OFF, the compressor is ready for operation, or in operation. When
failure or malfunction occurs to the compressor, the signal turns ON, in other words, the
contact output closes and the signal is conducted. To reset the alarm, push the “RST”
button on the front panel of the compressor. However, the failure or malfunction should be
cleared before the manual reset.
Note: When the compressor is turned OFF, ALARM signal turns ON for about two
seconds. It also turns ON for about 0.5 seconds at the start of applying current.
ULVAC CRYOGENICS INCORPORATED 2-9
To Next Page
Loading...