Cryomech LNP-40, Инструкция по установке, эксплуатации и текущему обслуживанию

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Operation
7-5
4) Reset the memory by rotating the Selector to the “Clear Memory” position for 5
seconds. All three yellow indicators should go off if the input power is correct.
5) Return the Selector to the “Auto Restart w/Delay” position.
6) Check the line voltage if the Over Voltage or Under Voltage indicators are still lit. The
required voltage for the LNP is printed on the identification label attached to the front
panel of the helium compressor.
7) If the Phase Loss or Unbalance indicator is lit, measure the voltage at each phase to
ensure they are balanced.
8) If the Phase Reversal indicator is lit, disconnect the helium compressor from the
power source. The position of two of the three hot wires of the helium compressor’s
power cord must be switched at the power source. Do not change the position of the
ground and/or neutral wire(s). See step 14.
9) Monitor the Output On indicator. The green indicator will continue to “Slow Flash” for
5 minutes. At the end of the 5 minute delay, the green indicator will “Fast Flash” for 3-
15 seconds before it is “Steady On”.
10) Close and latch the enclosure door.
11) The helium compressor may be started by pushing the green power switch.
12) Immediately check the low and high pressure gauges for a pressure differential of at
least 200 PSIG (13.76 bar). If the system is functioning correctly, there will be an
immediate increase in the high pressure gauge and an immediate decrease in the
low pressure gauge.
If there is NOT an immediate pressure differential turn off
the system.
13) Make certain the helium flex lines are oriented correctly. Verify that one of the helium
flex lines connects the high pressure port on the helium compressor to the high
pressure port on the cold head and that the other helium flex line connects the low
pressure ports.
14) If the flex lines are oriented correctly, perform the following steps to correct a
reversed compressor package:
a. Turn off the power switch.
b. Switch off the breaker on the front panel of the compressor package.
c. Turn off the dedicated circuit breaker to disconnect the system from the power at
the source to prevent electrical shock.
d. Examine the power cord and wire colors at the panel circuit breaker.
60 Hz configuration 50 Hz configuration
Hot Black Hot Black (One - 1)
Hot Red Hot Black (Two - 2)
Hot White Hot Black (Three - 3)
Ground Green Ground (or Earth) Green w/ Yellow Stripe
Figure 7-4: Color codes for 60 Hz and 50 Hz models
e. If your system is fitted with a 60 Hz power cord, switch the black and red wires. If
your system is fitted with a 50 Hz power cord, swap any two black wires.
f. Energize the breakers and press the power switch. The compressor package
should now operate properly.