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Control output has been left in “HAND” mode.
Switch back to “AUTO”.
It may be a normal part of the process.
None required.
LOW or LOW-LOW ALARM
Occurs if the sensor reading drops below the low alarm set points. If your unit is programmed for an alarm relay output, the alarm
relay will activate. The controller will continue to check the sensor reading, and any outputs using the sensor will remain active.
Possible Cause
Corrective Action
The process went further out of control than normal.
May have to increase chemical flow rate.
The chemical supply has run out.
Replenish the chemical supply.
The pump or valve or supply line is faulty.
Repair or replace the control device.
Wrong chemical is being controlled.
Replace with correct chemical.
The sensor is not responding to changes.
Repair or replace sensor. Evaluate mixing or recirculation.
The pump is siphoning, valve leaking.
Repair or replace the control device or re-route tubing.
Control output has been left in “HAND” mode.
Switch back to “AUTO”.
It may be a normal part of the process.
None required.
DEVIATION ALARM
Occurs if there is a redundant sensor virtual input, and the two sensors assigned are reading too far apart.
Possible Cause
Corrective Action
The deviation alarm setting may be too low
Adjust setting
One or both of the sensors may need cleaning and calibration
Clean and calibrate
One of the sensors may be faulty
Replace sensor
DI STATE CUSTOM MESSAGE
A digital input that is a DI State type can be set such that either the open or closed state generates an alarm. The alarm message may
be customized. The most common use for this will be a Flow Switch.
Possible Cause
Corrective Action
No flow
Check piping for closed valves, blockage, etc.
Check recirculation pump.
Faulty flow switch/cable
Check with ohmmeter.
Faulty controller
Check by shorting digital input in controller.
TOTAL ALARM
Occurs if the flow meter or feed monitor totalizer alarm limit is exceeded.
Possible Cause
Corrective Action
Normal operation
Reset the total to clear alarm, or wait for the automatic total reset to occur.
AC coupled onto flow meter cable
Route cable at least 6 inches (150 mm) away from any AC voltage
Noise coupled onto flow meter cable
Shield cable
RANGE ALARM (for flow meter or feed monitor type digital inputs)
Occurs if the flow meter or feed monitor accumulated total is too large. The maximum total is 1 trillion times the increment of the device. For
example, if the increment is one gallon per pulse the maximum total is 1 trillion gallons.
Possible Cause
Corrective Action
Normal operation
Reset the total to clear alarm, or wait for the automatic total reset to occur.
FLOW VERIFY
Occurs if the feed monitor digital input does not register any contacts while the control output for that pump has been active for longer
than the Flow Alarm Delay time.
Possible Cause
Corrective Action
Metering pump has lost prime
Re-prime metering pump
Faulty metering pump
Repair or replace metering pump
Incorrect feed monitoring device wiring
Correct wiring. Make sure that digital input that the feed monitoring
device is connected to has been assigned to the correct relay
Faulty feed monitoring sensor
Replace feed monitoring sensor
