Honeywell UDC2500 manual Procedure #1, Troubleshooting Power Failure Symptoms, Procedure #2

Troubleshooting/Service

Procedure #1

Table 7-5explains how to troubleshoot power failure symptoms.

Table 7-5 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	Withdraw the chassis and visually inspect the
	into the rear of the case	controller board and the inside of the case.
	properly.
3	Check the system for Brown-	Refer to Section 2 - Installation.
	outs, heavy load switching, etc.,
	and conformance to installation
	instructions.
4	Change Power board.	Installation instructions supplied with new
		board.

Procedure #2

Table 7-6explains how to troubleshoot Current Output failure symptoms.

Table 7-6 Troubleshooting Current Output Failure

Step	What to do	How to do it
1	Make sure the controller is	Make Output Set Up group function prompt
	configured for Current output	OUT ALG = CUR.
	and the proper range (4 to 20 or	Make the Output Set UP group function
	0 to 20) is configured.
		prompt CRANGE = 4–20 or 0–20 per your
		application.
		Refer to Section 3 - Configuration.
2	Check the field wiring.	Output impedance must be less than or equal
		to 1000 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	Refer to Section 6 - Output Calibration for
	Proportional output.	details.
5	Change Current Output board.	Installation instructions provided with new
		board.

6Change Controller

166 UDC2500 Universal Digital Controller Product Manual 4/07