Section 8 Troubleshooting
8-4
ULVAC CRYOGENICS INCORPORATED
8.3 Alarm code descriptions
＜Alarm status＞
→lights on → off
Reverse Phase, Open Phase, Low Volt
(Reverse phase, open Phase, or low voltage)
When the state of the compressor main power supply corresponds to following either
and the state continues 3 seconds or more, all LED indicators light up.
１． Reverse phase
２． Open phase
３． Low voltage (in case of nominal 170V or less)
When a voltage drop arises at the time of starting, a compressor stops immediately,
however the alarm is not turned on. It is because the voltage value returns to
normal, shortly after stopping. In this case, a start and a stop might be repeated.
Check and make sure that the line voltages (R-S, S-T, and T-R) of the power cable
are within the rated value. If these voltages are within the rated value and all
indicators are light up, there is a possibility of reverse phase. Check the wiring of
the main power supply referring to “Section 5.2(3) Checking the compressor status
and main power phase sequence”.
If the input power supply voltage is low, check the input power line and the user’s
power supply that has distributed electric power to the compressor.
When there is an open phase(s), all indicators should be blinked or turned off.
TS2 Over Temperature (Over temperature)
TS2 monitors the temperature of the compressor pump. If TS2 is activated it
means the compressor pump is in an unrecoverable abnormal condition. Please
contact our Service Engineering Division or the nearest customer support center
immediately.
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Troublesh cedures described above must be undertaken by an authorized
electrici nical personnel familiar with the structures and the risks of the
compresso s related components. To ensure safe, reliable system performance, read
her relevant manuals completely to gain thorough understanding
rk.
When a ssor does not need power supply to follow the procedure, shut down the
power of the compressor and lock it in the OFF status. Failure to observe this warning may
result in severe bodily injury or fatal accident.
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