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1. Go to Menu > Diagnostics > Inputs Outputs > Analog Inputs.
2. Watch touch screen as you unplug the affected sensors one by one to see if there is a change (A
change in the sensor reading may take up to 30 seconds).
3. Find out which sensor causes the other sensors to max out.
4. Replace the faulty sensor before it ruins the input card or PLC.
*If you cannot find a faulty sensor, go to Test 18: A.
**If replacing the faulty sensor does not fix the problem, go to Test 13.
***If replacing the faulty sensor does not fix the problem and you have a good input card (Test 13), replace
the PLC.
Test 18.B: Faulty Sensor Test (No Multimeter Required)
Tests
1
2
Boiler Water
Temp. Sensor
Boiler Sight Glass
Front Turn box
Y-Strainer
Pressure Relief
Valve
Low Water
Cutoff
Boiler Water
Level Sensor
Steam psi 1
Manual Steam
Pressure Gauge
Operating Pressure
Limit Switch (OPLS)
High Pressure
Limit Switch (HPLS)
Steam psi 2
Feed Water
Temp. Sensor
3
4