Honeywell UDC2300 - Table 10-5 Troubleshooting Power Failure Symptoms

Troubleshooting/Service
12/00 UDC2300 Controller Product Manual 109
Procedure #1
Table 10-5 explains how to troubleshoot power failure symptoms.
Table 10-5 Troubleshooting Power Failure Symptoms
Step What to do How to do it
1
Check the AC line voltage. Use a voltmeter to measure the AC voltage
across terminals L1 and L2 on the rear
terminal panel of the controller.
Check the earth ground connection.
2
Make sure the chassis plugs into
the rear of the case properly.
Withdraw the chassis and visually inspect the
controller board and the inside of the case.
3
Check the system for Brown-
outs, heavy load switching, etc.,
and conformance to installation
instructions.
Refer to Section 2 - Installation.
4
Change Main board. Installation instructions supplied with new
board.
Procedure #2
Table 10-6 explains how to troubleshoot Current Proportional Output failure symptoms.
Table 10-6 Troubleshooting Current Proportional Output Failure
Step What to do How to do it
1
Make sure the controller is
configured for Current output.
Make Algorithm Set Up group function prompt
OUT ALG = CUR.
Refer to Section 4 - Configuration.
2
Check the field wiring. Output impedance must be less than or equal
to 750 ohms.
3
Check the output. Put the controller into Manual mode and
change the output from 0 % to 100 % (4-20
mA). Use a DC milliammeter at the rear
terminals to verify the output.
4
Recalibrate the Current
Proportional output.
Refer to Section 9 - Output Calibration for
details.
5
Change Main board. Installation instructions provided with new
board.
6
Change Controller