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SECTION 11
TROUBLESHOOTING AND FAULTS
11.1 TROUBLESHOOTING
Equipment required:
Multimeter (voltage/current/ohms)
Beaker (size as needed)
Scale or balance (milligram resolution)
* The main 115VAC power source should be checked and verified as the first step before any further troubleshooting
is begun.
* Check and verify unregulated power supply voltage 24vdc (21vdc
-
29vdc).
* Check system and power supply fuses.
* Check the HMI for fault messages.
* Check and verify system air pressure.
* Check and verify liquid in the tanks.
* Check the PLC for the red fault light.
Before you start looking to see if a device is not working please ensure that all the electrical, pneumatic and hydraulic
connections are secure and in their proper places.
If you have any manual valves in place, make sure they are in the proper orientation to provide the necessary media.
Make sure the controller is in run mode. If the system is in standby mode it will ignore all attempts to trigger the sys-
tem. It must be in run mode to accept any trigger.
11.2 FAULTS
Alarm Mes-
sage
Cause
Potential Fixes
CH1/CH2 LIQUID
PRESSURE
ALARM
The liquid pressure
on channel 1/
channel2 has deviat-
ed outside the user
set tolerance range
for the user specified
tolerance time.
•
Check pump is on and liquid present
•
Check manual valve orientation if present
•
If desired, ensure that the Liquid Pressure PID is in closed loop
•
Navigate to Sensor configuration screen and check the sensor is configured correctly
•
Check pressure control signal (normally AO1/AO2) on the monitor I/O screen for a non
-
zero (4000 or greater) value
•
Check that alarm tolerance time and window are set correctly in the Alarm Settings
CH1/CH2 FLOW
RATE ALARM
The flow rate on
channel 1 has deviat-
ed outside the user
set tolerance range
for the user specified
tolerance time.
•
Check pump is on and liquid present
•
Check manual valve orientation if present
•
If desired, ensure that the DC PID is in closed loop
•
Navigate to Sensor configuration screen and check the sensor is configured correctly
•
Check that REF PRESSURE and REF FLOW are entered correctly on the config screen
•
If zoning is enabled, ensure that the ZONE REF FLOW is entered correctly, along with
all other parameters on the zone control screen
•
Check that alarm tolerance time and window are set correctly on the Alarm Settings.
