Emerson Process Management 1500 11.8I/O problems, 2 I/O problems and remedies, Troubleshooting

Troubleshooting

Some fault conditions can be corrected by cycling power to the transmitter. A power cycle can clear the following:

•Loop test

•Zero failure

•Stopped internal totalizer

11.8I/O problems

If you are experiencing problems with an mA output, discrete output, or discrete input, use Table 11-2 to identify an appropriate remedy.

Table 11-2I/O problems and remedies

Symptom	Possible cause	Possible remedy
No output	Power supply problem	Check power supply and power supply wiring.
Loop test failed		See Section 11.14.1.
	Fault condition present if fault	Check the fault indicator settings to verify
	indicators are set to downscale or	whether or not the transmitter is in a fault
	internal zero	condition. See Section 4.5.4 to check the mA
		fault indicator.
		If a fault condition is present, see Section 11.7.
	Channel not configured for desired	Verify channel configuration for associated
	output (Channel B or C only)	output terminals.
mA output < 4 mA	Process condition below LRV	Verify process.
		Change the LRV. See Section 4.5.2.
	Fault condition if fault indicator is set to	Check the fault indicator settings to verify
	internal zero	whether or not the transmitter is in a fault
		condition. See Section 4.5.4.
		If a fault condition is present, see Section 11.7.
	Open in wiring	Verify all connections.
	Channel not configured for mA	Verify channel configuration.
	operation
	Bad mA receiving device	Check the mA receiving device or try another
		mA receiving device. See Section 11.16.
	Bad output circuit	Measure DC voltage across output to verify that
		output is active.
Constant mA output	Output is fixed in a test mode	Exit output from test mode. See Section 3.3.
	Zero calibration failure	Cycle power.
		Stop flow and rezero. See Section 3.5.
mA output consistently out of	Fault condition if fault indicator is set to	Check the fault indicator settings to verify
range	upscale or downscale	whether or not the transmitter is in a fault
		condition. See Section 4.5.4.
		If a fault condition is present, see Section 11.7.
	LRV and URV not set correctly	Check the LRV and URV. See Section 11.20.
Consistently incorrect mA	Output not trimmed correctly	Trim the output. See Section 3.4.
measurement
	Incorrect flow measurement unit	Verify flow measurement unit configuration. See
	configured	Section 11.19.
	Incorrect process variable configured	Verify process variable assigned to mA output.
		See Section 4.5.1.
	LRV and URV not set correctly	Check the LRV and URV. See Section 11.20.

Compensation

Measurement Performance

Troubleshooting

Defaults

Configuration and Use Manual 93