C30HVRT Compressor Unit Instruction Manual
ULVAC CRYOGENICS INCORPORATED
5-3
of C30MVR, the same is applied to C30HVRT. (Figure5-3 and 5-4 are the same.)
If the buzzer keeps ringing after power-on and all eight STS indicators light up, it means
that either the following faults has occurred; reversed phase of the input power cable, open
phase or low voltage.
Figure 5-3 shows the display status described above.
If there is a reversed or open phase, rewiring of the input power cable is required.
First, turn OFF the breaker for the compressor at the equipment side and cut off the power
supply. Then check the order and colors of the wires of the input power cable to ensure
that they are wired properly. If they are not correct, rewire them properly.
After the correction, power-on the compressor from the equipment side and check the STS
indicators. If all STS indicators light up even though the phase sequence is correct, check
if the power supply voltage and input power cable is normal or not.
Besides these statuses described above, if one of the STS indicators lights up and/or the
buzzer sound does not stop, refer to “Section 8 Troubleshooting” to solve the problem.
Figure 5-2 Ready for operation Figure 5-3
ase o se Reversed ph r open pha
WARNING
There is a danger of hazardous voltage. Only qualified electrical personnel familiar with the
construction and risks of this equipment should perform procedure above.
Failure to observe this precaution could result in severe bodily injury or loss of life
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