Walchem W600 Series Instruction Manual page 93

RANGE ALARM (for sensor inputs)
It indicates that the signal from the sensor is out of the normal range. This error condition will stop control of any output using the
sensor. This prevents controlling based upon a false sensor reading. If the temperature sensor goes into range alarm, then the controller
will go into manual temperature compensation using the Default Temperature setting.
Possible Cause
Sensor wires shorted
Faulty sensor
Faulty controller
EVENT SKIPPED ALARM
An event skipped alarm is set when a second timer event occurs while one event is still running. An event skipped alarm is also set when
the timer relay never turns on during an event because of an interlock condition. The alarm is cleared when the relay is next activated
for any reason (the next timer event or HAND mode or "activate with" force on condition).
Possible Cause
Incorrect programming
Long duration interlock condition
SENSOR FAULT
This error indicates that the signal from the sensor is no longer valid at all. This error condition will stop control of any output using
the sensor.
Possible Cause
Sensor wires shorted
Faulty sensor
Faulty controller
INPUT FAILURE
This alarm indicates that the sensor input circuit is no longer working, or that one of the inputs used to calculate a virtual input is in a
Sensor Fault condition. This error condition will stop control of any output using the input.
Possible Cause
Faulty controller
If using virtual inputs, sensor fault of one of the inputs
BATTERY POWER LOW
This alarm indicates that the battery which holds the date and time in memory is below 2.4 VDC.
Possible Cause
Faulty battery
SYSTEM TEMP LOW
This alarm indicates that the temperature inside the controller is below -10 °C.
Possible Cause
Low ambient temperatures
SYSTEM TEMP HIGH
This alarm indicates that the temperature of the controller or sensor processor IC is above 75 °C, or that the temperature of the Eth-
ernet card processor IC is above 85 °C.
Possible Cause
High ambient temperatures
High power draw
DISPLAY ERROR
This alarm occurs if the user interface gets lost
Possible Cause
Pressing icons very quickly
N ETWORK CARD FAILURE
This alarm occurs if the Ethernet circuit board fails
Possible Cause
Ethernet card locked up
Corrective Action
Disconnect short
Replace sensor
Replace or repair controller
Corrective Action
Reprogram to eliminate overlapping events
Normal operation
Correction Action
Disconnect short
Replace sensor
Replace or repair controller
Correction Action
Replace or repair controller
See Sensor Fault troubleshooting above
Correction Action
Replace battery
Correction Action
Provide heat for the controller
Correction Action
Provide cooling for the controller
Do not use the controller's 24VDC to power more than 1.5W total
Correction Action
Exit out of the screen and continue programming
Correction Action
Try a power cycle to reset it
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