Honeywell VRX180 user manual Diagnostic Messages, Diagnostic Error Messages

Diagnostic and error messages

9.Diagnostic and error messages

9.1Diagnostic Messages

The instrument executes diagnostic routines during instrument start-up and during maintenance procedures such as calibration. It also monitors online operation for both process faults and instrument errors.

Error messages

Table 9-1shows messages that may appear on the instrument displays if a diagnostic condition is detected, along with the action you should take.

Table 9-1 Diagnostic Error Messages

Message	Description	User action
INPUT FAILURE	The analog input is either open/shorted	Check input devices for open or short.
	The analog input has been exposed to	See Section 2 for proper wiring
	electromagnetic noise.	techniques.
	The analog input is out of range	Choose a higher range.
FLOAT PT ERROR	A floating point calculation error has occurred.	Check Free Form Math and Math CV
	(divide by zero, underflow, overflow).	inputs for division by 0. Also check for
		input values producing an underflow or
		overflow error (that is, calculation is not
		between -1x10-38and -3x1038or is not
		between 1x10-38and 3x1038).
CHECKSUM	An error was detected in the database of one	Inspect entire instrument configuration
ERROR	or more function blocks. The affected	and reconfigure as needed.
	function blocks are reset to their defaults.

ATTENTION

Be advised that the INPUT FAILURE diagnostic will continue to be displayed even after its cause has

disappeared. After verifying that this diagnostic’s cause has been corrected, you may clear the INPUT FAILURE message from all ON LINE screens by performing one of the following sequences of steps.

1) Acknowledge the INPUT FAILURE diagnostic.

From the ON LINE main menu, select ACCESS SUMMARIES. Select DISPLAY DIAGNOSTICS. Use the <Up> and <Down> buttons to highlight the INPUT FAILURE diagnostic(s) that you wish to acknowledge and then press <Enter>. Once the diagnostic has been acknowledged, it will still be listed in the DISPLAY DIAGNOSTICS screen but will no longer be displayed on any ON LINE screen.

2) Delete the INPUT FAILURE diagnostic.

From the ON LINE main menu, select ACCESS SUMMARIES. Select DELETE ALL DIAGNOSTICS. Once this menu choice has been executed, all diagnostic messages will be deleted from the DISPLAY DIAGNOSTICS screen and will no longer be displayed on any ON LINE screen.

During power-up, if an analog input is open or is out of range, the setpoint and process variable values will display OFF and the loop's AUTO mode is disabled. Check connections to determine problem. During calibration if the input reference voltages supplied by the technician are outside acceptable limits a "CALIB FAIL" message will be generated.

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