FRICK
QUANTUM™LX AcuAir
CONTROL PANEL 090.510-M (OCT 10)
MAINTENANCE Page 29
TROUBLESHOOTING A PROBLEM THAT APPEARS UNEXPLAINABLE
When there is a problem that makes no sense due to
unexplainable things happening, check the following:
□
Is the panel powered by an isolating power
source such as a control transformer?
□
Is the panel powered from a lighting or utility
panel?
□
Has the unit ever worked properly?
□
If the unit used to work properly, try to determine
when the problem first showed up.
□
It is important to know if the problem occurs
randomly, frequently, or all the time.
□
Check what the temperature is at the unit
location. Is it very hot or very cold?
□
Make sure that a motor is not blowing exhaust air
on the control panel.
□
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 water, refrigerant, or oil leaked into the
panel or conduit?
□
If it just started to act up, then check if anything
was recently changed in the system (i.e. software
or hardware.)
□
If it just started to act up, then check if any
service was recently done to the unit or its
electrical system?
□
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. 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. 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.)
□
If this is an older plant, has the plant wiring been
brought up to code?
□
Is power wiring mixed with control wiring?
□
Is power wiring mixed with sensor wiring?
□
Is power wiring mixed with communications
wiring?
□
Ensure that 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.
□
Ensure that 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 insulated at the temperature probe
and grounded at the panel end.
□
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
appropriate channel of the Analog board and
then use a DVM and check each white wire to
machine ground and each black wire to machine
ground.
□
Check 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.
□
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.
□
Ensure that there is no AC wiring lying next to
any printed circuit boards.
□
Unexplainable unit failures are usually indicative
of noise due to wiring problems (i.e. incorrect
earth grounds, mixed power and control wiring,
unsuppressed coils, etc)
□
If the unit is unexplainably shutting down, check if
the machine shares power with something else.
Resetting the IP Address
In the rare occurrence that a local Air Handler loses
Ethernet communications with the web browser or
Operator Interface Panel, it could be that the unit has
an invalid IP address. One way that this could happen
would be if the unit has just had a program upgrade,
without the setpoints being properly saved then
restored (the IP address is stored as a setpoint to the
flash card).
In order to correct this situation, perform the following
steps:
1.
Power down the failing unit.
