Walchem WebMaster ONE Instruction Manual page 168

Pump Failure (one for each monitored)
This error message appears if contact closures from the Feed Verification flow monitor are
expected but are not detected by the digital input option circuit board.
Possible Causes
Metering pump has lost prime.
Faulty metering pump.
Faulty metering pump wiring.
Faulty Feed Verification device wiring.
Faulty Feed Verification sensor.
Blown fuse.
Faulty output relay.
Faulty digital input circuit board.
4-20 mA Input High Alarm
This error message is caused by the 4-20 mA signal exceeding the user-programmed value for the
high alarm limit.
Possible Causes
The process value being measured by the
transmitter is out of specifications
.
The high alarm limit for the process being
measured is set too low.
There is a problem with the transmitter that
needs to be addressed by the manufacturer of
the transmitter.
Corrective Actions
Re-prime metering pump.
Repair or replace metering pump.
Correct wiring.
Correct wiring. Make sure that digital input
that the Feed Verification device is connected
to has been assigned to the correct relay
in the Feed Verification Page.
Replace Feed Verification sensor.
Replace fuse (F2 or F3)
Replace relay board.
Verify that Feed Verification device is making
contact closures using an ohmmeter. If OK, and
connected properly, replace digital input
board.
Corrective Actions
Determine the reason for the out of spec
condition.
Increase the high limit in the 4-20 mA
Input Page.
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