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254 UDC 3300 Controller Product Manual 4/00
Procedure #2
Table 9-9 explains how to troubleshoot Current Proportional Output
failure symptoms.
Table 9-9 Troubleshooting Current Proportional Output Failure
Step What to do How to do it
1
Make sure the controller is
configured for Current output.
Make Algorithm Set Up group function
prompt OUT ALG or OUT2 ALG =
CURRNT.
Refer to Section 3 - Configuration.
2
Check the field wiring. Output impedance must be less than
or equal to 1000 ohms.
3
Make sure all the configurable
tuning constants, limits, and
configuration data stored in the
controller are correct. Reconfigure,
if necessary.
Refer to Section 3 - Configuration to
check all this data and how to
reconfigure.
4
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.
5
Recalibrate the Current Proportional
output.
Refer to Section 8 - Output Calibration
for details.
6
Change MCU/Output board. Refer to Table 9-23.