C30HVRT Compressor Unit Instruction Manual
ULVAC CRYOGENICS INCORPORATED 8-5
TS1 Over Temperature (Over temperature)
TS1 monitors the temperature of the helium supply line. If TS1 is activated it
means the compressor is in an unrecoverable abnormal condition. Contact our
Service Engineering Division or the nearest customer support center immediately.
TS3 Over Temperature (Over temperature)
This temperature switch is activated when cooling water does not meet the
requirements and/or cooling water lines are not connected properly. Refer to
“Section 2.3 Cooling water requirements” and ensure that the temperature and flow
rate of cooling water are appropriate for the compressor specification. If they are
not appropriate correct them to within the proper range. Wait 15 minutes for the
temperature switch to recover and then push the “RST” button to clear the alarm.
LPS Low Helium Pressure (Reduction of helium pressure)
This pressure switch monitors the pressure reduction in the helium return line.
When there is helium leakage or the helium filling pressure is lower than the preset
value, the switch will operate (The set pressure of this switch is 0.1±0.02MPaG).
Check the connections of the flexible hoses and the helium filling pressure referring
to “Section 4.3 Connecting and disconnecting helium flexible hoses” and “Section
5.1 Verification of helium static pressure”. If the alarm is not cleared by the
procedures above, please contact our Service Engineering Division or the nearest
customer support center immediately.
CP2 Cold Head Trip (Over current of cryocooler)
When this alarm lights up, it means there is an over current in the cryocooler motor
circuit and the circuit protector (CP2) has been activated.
Turn OFF the compressor and check the compressor side, cryocooler cable, and
cryocooler motor for evidence of earth fault or short circuit.
If there is an earth fault or short circuit in the parts above or no identified cause,
Please contact our Service Engineering Division or the nearest customer support
center.
If the power supply voltage is abnormally high compared to the rated working
voltage (Table1-3), it may cause an over current on the cryocooler motor and the
circuit protector (CP2) may activates.
OL1 Comp. Over Current (Over current or open phase of compressor)
This alarm is activated when OL1 detects an over current or open phase in the
compressor motor.
Check that the helium pressure is not higher than the set value on the helium
pressure gauge. Refer to “Section 5.1 Verification of helium static pressure” for
helium pressure set value and “Appendix C C30HVRT compressor electrical
circuit” for OL1 set value.
Turn OFF the power of the compressor for at least 5 minutes and then turn it ON
again to clear the alarm. If the problem is not solved, please contact our Service
Engineering Division or the nearest customer support center.
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