28
72-910-24 Revision H
TROUBLESHOOTING GUIDE
Symptom
Probable Cause
Possible Solution
Controller does not power
up.
No power supplied to controller.
Ensure that correct voltage is supplied
to controller.
Check circuit breaker supplying power
to the controller.
Fuse is blown.
check/replace fuses F1-F3 (
see
Figure 6, Page 10
)
Ribbon cable.
Check ribbon cable connecting upper
and lower pc boards inside controller.
Controller displays "Cond
Low” alarm message.
Conductivity reading below programmed low
limit.
Adjust conductivity low limit setting
(
See Page 23 and 24
).
Excessive amount of steam flash across the
conductivity probe.
Check throttling device
Blowdown valve stuck open.
Replace/clean blowdown valve.
Controller displays "Cond
High” alarm message.
Conductivity reading above programmed high
limit.
Adjust conductivity high limit setting
(
See Page 23 and 24
).
Excessive amount of solids and/or debris in and
around conductivity probe.
Clean flow assembly.
Faulty blowdown valve.
Replace blowdown valve.
Clogged blowdown valve or drain.
Clean valve or drain.
Controller displays
"Probe Temp" alarm
message.
Probe temperature too high.
Allow process water to cool.
Probe temperature compensation circuitry failure.
Replace probe.
Controller displays
"Probe Comm" alarm
message.
Conductivity probe wiring or connector loose.
Check probe connections (
See Figure
7, Page 11
).
Bad Conductivity probe
Replace probe.
Controller displays "Clock
Err" alarm message.
Internal controller clock failure.
Replace controller.
Controller displays
"Blowdown Limit" alarm
message.
Conductivity Limit timer set too short.
Adjust limit timer.
Blowdown valve/drain failure.
Clear obstruction around drain.
Controller displays
"Watchdog" alarm
message.
Internal controller failure.
Replace controller.
