Honeywell UDC2500 Background Tests, Lower Reason for Failure How to Correct the Problem Display

Troubleshooting/Service

7.5Background Tests

Introduction

The UDC2500 performs ongoing background tests to verify data and memory integrity. If there is a malfunction, a diagnostic message will be displayed (blinking) in the lower display.

In the case of simultaneous malfunctions, the messages will appear in sequence in the lower display. Table 7-3lists these background tests, the reason for their failure, and how to correct the problem.

Diagnostic messages may be suppressed (stop the blinking) by pressing the RUN/HOLD key. The messages will still be available for viewing by pressing the LOWER DISPLAY key.

Table 7-3 Background Tests

Lower		Reason for Failure		How to Correct the Problem
Display
E FAIL	Unable to write to non-volatile		1.	Check the accuracy of the parameter and re-
	memory. Anytime you change a			enter.
	parameter and it is not accepted, you		2.	Try to change something in configuration.
	will see E FAIL.		3.	Run through Read STATUS tests to re-write
				to EEPROM.
FAILSF	This error message shows whenever		1.	Run through STATUS check to determine the
	the controller goes into a failsafe			reason for the failure.
	mode of operation. This will happen if:		2.	Press the SET UP key until STATUS appears
	•	RAM test failed		in the lower display.
	•	Configuration test failed	3.	Press the FUNCTION key to see whether the
	•	Calibration test failed
				tests pass or fail, then run through the
	•	Burnout configured for none
				STATUS codes a second time to see if the
		and the input failed.
				error cleared.
IN1RNG	Input 1 out of range. The process		1.	Make sure the range and actuation are
	input is outside the range limits.			configured properly.
			2.	Check the input source.
			3.	Restore the factory calibration. (See
				Subsection 0.)
			4.	Field calibrate. See Section 5 - Input
				Calibration.
IN1_FL	Two consecutive failures of input 1		1.	Make sure the actuation is configured
	integration; i.e., cannot make analog			correctly. See Section 3 - Configuration.
	to digital conversion. This will happen		2.	Make sure the input is correct and that it has
	if:			not burned-out (opened).
	• Upscale or Downscale		3.	Check for gross over-ranging with a
		burnout is selected and the
				multimeter.
		input is open
			4.	Restore factory calibration. See Subsection
	•	Input not configured correctly
		for the sensor being used		5.8

162 UDC2500 Universal Digital Controller Product Manual 4/07