Walchem W600 Series, Instruction Manual, Page: 69 / 88

66
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 totalizer alarm limit is exceeded.
Possible Cause Corrective Action
Normal operation Reset the total to clear alarm
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
TOTAL RANGE LIMIT
Occurs if the flow meter totalizer range limit is exceeded. The maximum flow total is 1 trillion times the
increment of the flow meter. For example, if 1 gallon/contact or if K Factor = 1 pulse/liter, the maximum
total is 1 trillion gallons.
Normal operation Reset the total to clear alarm
OUTPUT TIMEOUT
This error condition will stop control. It is caused by the output (either relay or analog) being activated for
longer than the programmed Time Limit.
Possible Cause Corrective Action
The process went further out of control than normal. Increase time limit or reset timer.
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. Replace sensor. Evaluate mixing or recirculation.
RANGE ALARM
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 Corrective Action
Sensor wires shorted Disconnect short
Faulty sensor Replace sensor
Faulty controller Replace or repair controller