QUANTUM
™
HD COMPRESSOR CONTROL PANEL
MAINTENANCE
090.040-M (NOV 2016)
Page 59
When there is a problem that makes no sense due to
unexplainable things happening, check the following:
1. Were the recommendations for Electrical Installation fol-
lowed? (See Frick publication 090.400-SB).
2. Is the panel powered by an isolating power source
such as a control power transformer in the motor starter
panel?
3. Verify that the panel is not powered from a lighting or
utility panel.
4. Did the unit ever work properly?
• If the unit used to work properly, try to determine when
the problem rst showed up.
5. It is important to know if the problem occurs randomly,
frequently, at the same time everyday or all the time.
6. Check what the temperature is in the engine room and
at the panel. Is it very hot (>110°F) or very cold (<32°F)?
• Make sure that the motor is not blowing exhaust air on
the control panel.
7. If the problem just started occurring, was there recently
a severe lightning storm, re, ood, or a plant accident:
• Has any water, refrigerant, or oil leaked into the panel
or any conduit?
8. If the problem just started occurring, then check if any-
thing was recently changed in the system (i.e. software
or hardware.)
9. If the problem just started occurring, then check if any
service was recently done to the compressor or its elec-
trical system?
10. If there is communication wiring connecting the panel to
another panel or device, then check the following:
• If the Quantum™ HD is unexplainably shutting down, try
disconnecting the communications cable to see if the
problem goes away.
• Check if the communications cable shields are tied to
machine ground at only one location. For a PLC or Opto22
based system, the shield should normally be tied only at
the PLC or Opto22 panel.
• Check that you are using the Frick recommended
communications cable.
11. Is the plant wiring up to code? (See Frick publication
090.400-SB)
12. Do you have power wiring (>50V) mixed with control,
sensor or communications wiring?
13. Check that the starter panel is grounded to the plant
transformer. There are usually four wires: 3 for the 3
phases and 1 for plant ground.
14. Check that the motor is grounded to the starter panel.
There are usually four wires: 3 for the phases and 1
for ground.
15. Ensure that one side of the motor current transformer
is grounded in the motor starter panel. The wire to the
control panel terminal #2 is usually the only one grounded.
16. Check that the pressure transducers are properly
grounded.
17. Check that temperature transducers are properly
grounded.
18. Check to see if one of the temperature probes have a
signal wire shorted to machine ground.
19. Check that all inductive loads (i.e. coils, solenoids, or
relays, etc.) connected to the I/O output modules have
surge suppressors across them, preferably at the devices.
The larger factory installed inductive loads will have surge
suppressors as well.
20. Make sure that you have a continuous ground back to the
power source (plant transformer). The ground connection
must be aluminum or copper. A conduit ground will not
work. Do not drive a ground stake at the compressor since
extraneous currents will be attracted to the compressor.
21. Make sure that there is no AC wiring lying next to any
printed circuit board.
22. Unexplainable compressor auxiliary failures are usually
indicative of noise due to wiring problems (i.e. incorrect
earth grounds, mixed power and control wiring, unsup-
pressed coils, etc)
23. If the compressor is unexplainably shutting down, check
if the machine shares control transformer power with
something else. Make sure each compressor has its own
isolation transformer in the motor control center off the
three-phase bus with the secondary properly grounded.
SECTION 8
-
TROUBLESHOOTING
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