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

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Emerson Process Management 1500 11.8 I/O problems, 2I/O problems and remedies, Symptom Possible cause Possible remedy
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