Troubleshooting/Service
324 UDC3500 Universal Digital Controller Product Manual 3/07
7.7.5 Procedure #5 – Current/Time or Time Current/Proportional
Table 7-9 explains how to troubleshoot Current/Time or Time/Current Proportional
Output failure.
Table 7-9 Troubleshooting Current/Time or Time/Current Proportional
Output Failure
Step What to do How to do it
1
Make sure the controller is configured
for Time/Current or Current/Time
Proportional output.
Make Output Algorithm Set Up group function
prompt OUT ALG = TCUR or CURT.
Refer to Section
3 – Configuration.
2
Check the field wiring. Make sure the NO or NC contact wiring selection
is correct.
Refer to Section 2 – Installation for details
.
3
Check the relay output. Put the controller into Manual mode. Vary the
output above and below the present value.
Observe OUT1 indicator (Loop 1) or OUT3
indicator (Loop 2) on the operator interface.
Contact should change state. 0 % open, 100 %
closed. Listen for a click from the relay when the
OUT1 or OUT3 indicator changes state.
4
Check the Current Proportional
Output.
Put the controller into Manual mode and change
the output from 0 % to 100 % (4-20 or 0-20 mA).
Use a DC milliammeter at the rear terminals to
verify the output.
5
Recalibrate the controller. Refer to Section
1 – Output Calibration for details
.
6
Change Current Output or Relay
board.
Installation instructions supplied with new board.
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