Troubleshooting/Service
4/07 UDC2500 Universal Digital Controller Product Manual 167
Procedure #3
Table 7-7 explains how to troubleshoot Position Proportional Output failure symptoms.
Table 7-7 Troubleshooting Three Position Step Control Output Failure
Step What to do How to do it
1
Make certain that the controller
is configured for Three Position
Step control.
Make Output Algorithm Set Up group function
prompt OUT ALG = TPSC.
Refer to
Section 3.8.
2
Check the field wiring. Refer to Section 2 - Installation for details.
3
Check the output. Put the controller into Manual mode and
change the output from 0 % to 100 %.
4
Check whether the motor
drives in both directions.
Remove controller and short out Output 1 or
Output 2. The motor should go to either open
or closed. If it does controller is ok. If not,
repeat Step 1.
5
Check whether the motor
drives in either direction. If the
motor does not drive in either
direction, check the motor. If
the motor drives in one
direction but not the other, go
to Step 6
Refer to the motor instructions.
6
Make sure the output relays
are actuating properly.
Put the controller into Manual mode. Vary the
output above and below the present value.
Observe “OT” in the Lower Display and the
Relay Annunciators on the operator interface.
If they are not working properly, check the field
wiring, then go to Step 5.
If they are, go to Step 7.
7
Change the two Output Relays
or the Dual Relay Board
(depending upon unit)
Installation instructions supplied with the new
relays or board.
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