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11
Controller Fault Condition Displays
Below are examples and explanations of the displays which accompany the fault conditions possible on the
CPU-4. Fault conditions always indicate a problem of some sort which requires corrective action. the displays
provide sufficient information to recognize the source of the fault and the required corrective action.
Low Pressure Fault: (System is responding to low pressure condition per system settings)
Line 1 “Service Fault”
Line 2 “Low Feed Pressure”
Line 3
Line 4 “Restart in MM:SS”
Pre Treat Fault: (Pretreat Switch is closed indicating problem with pretreat system).
Line 1 “Service Fault”
Line 2 “Pretreat”
Line 3
Line 4 “Check Pretreat Sys.”
Permeate Conductivity Fault: (Permeate conductivity is higher than the alarm set-point.)
Line 1 “Service Fault”
Line 2 “Permeate TDS xxx ppm” or “Permeate Cond xxx uS”
Line 3 “Alarm SP xxx ppm” or “Alarm SP xxx uS”
Line 4 “To Reset Push OFF/ON”
Feed Conductivity Fault: (Feed conductivity is higher than the alarm set-point.)
Line 1 “Service Fault”
Line 2 “Feed TDS xxx ppm” or “Feed Cond xxx uS”
Line 3 “Alarm SP xxx ppm” or “Alarm SP xxx uS”
Line 4 “To Reset Push OFF/ON”
Conductivity Probe Error messages:
Line 2 “Inteference” - Noise detected by conductivity circuit, valid measurement not possible.
Line 2 “Over-range” - Measurement is out of range for the circuit, probe may also be shorted
Line 2 “Probe shorted” - Short circuit detected on temperature sensor in probe
Line 2 “Probe not detected” - Open circuit detected on temperature sensor in probe (white & unshielded wire)
Line 2 “Probe Startup 1” - Internal reference voltage too high to make valid measurement
Line 2 “Probe Startup 2” - Internal reference voltage too low to make valid measurement
Line 2 “Probe Startup 3” - Internal excitation voltage too high to make valid measurement
Line 2 “Probe Startup 4” - Internal excitation voltage too low to make valid measurement