S90-555 M FRICK QUANTUM™ CONDENSER/VESSEL CONTROL PANEL
Page 10 MAINTENANCE
CONDENSER". Additionally, the Version
number should match between all GCU
EPROMS, as well as the program version of
the Quantum (as shown on the
“About…”screen). As an example, if the
Quantum version is 2.11, then all GCU
boards must have version 2.11. The GCU
boards may have an additional digit in the
version number, such as 2.112. This final
digit is not critical with the compatibility of the
system.
4. Ensure that all jumpers, dip switches, I/O
modules and components are properly setup on
the new board as it was on the old board.
5. Install the modified replacement board in the
enclosure.
After replacing a GCU board, it will automatically be
detected after the Quantum power has been cycled off
then on. It will then be necessary to re-enter all setpoints
and calibration data to the board. Refer to the Factory
Setup Instructions for more information (S90-555 FSI).
DISPLAY REPLACEMENT
1. Shut off control power.
2. Remove the defective display.
3. Install the new display.
TROUBLESHOOTING A PROBLEM THAT
APPEARS UNEXPLAINABLE
When there is a problem that makes no sense due to
unexplainable things happening, then check the following:
1. It is important to know if the unit ever worked
properly.
2. If the unit used to work properly, try to determine
when the problem first showed up.
3. It is important to know if the problem occurs
randomly, frequently, or all the time.
4. Check what the temperature is in the engine
room and at the panel. Is it very hot or very cold?
Make sure that the motor is not blowing
exhaust air on the control panel.
5. If it just started to act up, then check if there was
recently a severe lightning storm, fire, flood, or a
plant accident. If any of the following conditions
are possible, then check for it:
Has any liquid leaked into the panel or
conduit?
6. If it just started to act up, then check if anything
was recently changed in the system (i.e. software
or hardware.)
7. If it just started to act up, then check if any
service was recently done to the electrical
system?
8. If there is communication wiring connecting the
panel to another panel or device, then check the
following:
If the Quantum™ 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.
Check that you are using the Frick
recommended communications cable. See
manual to match proper cable with type of
communications (i.e., RS-422, RS-232, RS-
485, or some other type of factory
communication bus system.)
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 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 insulated 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 control
panel.
14. Check that temperature transducers are properly
grounded. 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.
15. Check if one of the temperature probes has a
signal 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.
16. Ensure that all inductive loads (i.e. Coils,
Solenoids, or Relays, etc.) connected to the I/O
output modules have surge suppressers across
them, preferably at the devices and not at the
panel end.
17. If the control settings unexplainably change, 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 replace the keypad.
18. Make sure that you have a continuous ground
back to the power source. The ground connection
must be aluminum or copper. A conduit ground
will not work
19. Make sure that there is no AC wiring lying next to
printed circuit boards.
20. Unexplainable auxiliary failures are usually
indicative of noise due to wiring problems (i.e.
incorrect earth grounds, mixed power and control
wiring, unsuppressed coils, etc)
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