Frick QUANTUM Maintenance Manual page 7

9. If this is an older plant, has the plant wiring been brought
up to code?
10. Do you have power wiring mixed with control wiring?
11. Do you have power wiring mixed with sensor wiring?
12. Do you have power wiring mixed with 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 3 phases and 1
for ground.
15. Check that one side of the motor current transformer is
grounded in the motor starter panel. It should be
grounded in the starter panel. The wire to the micro
panel terminal #4 is usually the only one grounded.
16. Check that the pressure transducers are properly
grounded. The two types of transducers you may have
are as follows: an older type has an 8 to 10 inch 3-
conductor pigtail coming out of the transducer. This type
will have the attaching cable's shield cut off and insu-
lated at the transducer end. The shield is then tied to a
panel ground terminal in the panel. The newer type
has the cable as an integral part of the housing and
has the shield crimped to the case at the transducer
end. This type of transducer has the cable's shield cut
off and insulated in the micro panel.
17. Check that the temperature transducers are properly
grounded. The temperature probes usually have two
short wires coming out of the sensor and are tied to a
shielded cable at the thermal well head. The shield is
grounded at the temperature probe and insulated at
the panel end.
FRICK QUANTUM CONTROL PANEL
MAINTENANCE
18. Check if one of the temperature probes has a signal
19. Check that all inductive loads (i.e. Coils, Solenoids, or
20. If the compressor control settings unexplainably change
21. Make sure that you have a continuous ground back to
22. Make sure that there is no AC wiring lying next to the
23. Unexplainable compressor auxiliary failures are usu-
24. If the compressor is unexplainably shutting down, check
wire shorted to machine ground. To do this, first pull the
orange plug from the micro board and then use an
Ohmmeter and check each white wire to machine
ground and each black wire to machine ground.
Relays, etc.) connected to the I/O output modules have
surge suppressers across them, preferably at the de-
vices and not at the panel end.
modes, it may be a noise problem affecting the keypad's
input circuit. Check if it works OK with the keypad cable
disconnected. If it works OK, then check the grounding
as described above. If the grounding is OK then re-
place the keypad.
the power source. The ground connection must be alu-
minum or copper. A conduit ground will not work. Do
not drive a ground stake at the compressor since extra-
neous currents will be attracted to the compressor.
printed circuit board.
ally indicative of noise due to wiring problems (i.e. in-
correct earth grounds, mixed power and control wiring,
unsuppressed coils, etc)
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 of the three-phase bus with the secondary properly
grounded.
S90-010 M
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