Procedure #1 - Power; Procedure #2 - Current Outputs; Table 7-5 Troubleshooting Power Failure Symptoms; Table 7-6 Troubleshooting Current Output Failure - Honeywell UDC3500 Product Manual

7.6.1 Procedure #1 – Power
Table 7-5 explains how to troubleshoot power failure symptoms.

Table 7-5 Troubleshooting Power Failure Symptoms

Step
Check the AC or DC line
1
voltage.
2 Make sure the chassis plugs
into the rear of the case
properly.
Check the system for
3
Brownouts, heavy load
switching, etc., and
conformance to installation
instructions.
4 Change Power board.
7.6.2 Procedure #2 – Current Outputs
Table 7-6 explains how to troubleshoot Current Output failure symptoms.
Step
1 Make sure that the controller is
configured correctly and that the
proper range (4 to 20 or 0 to 20)
is configured.
Check the field wiring.
2
First Current Output: Test for
3a
operation.
Second Current Output: Test for
3b
operation.
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What to do

Table 7-6 Troubleshooting Current Output Failure

What to do
UDC3500 Universal Digital Controller Product Manual
How to do it
Use a voltmeter to measure the AC or DC
voltage across terminals L1 and L2 on the rear
terminal panel of the controller.
Check the earth ground connection.
Withdraw the chassis and visually inspect the
controller board and the inside of the case.
Reseat the boards into the Chassis if
necessary.
Refer to Section 2 - Installation.
Installation instructions supplied with new
board.
How to do it
Refer to Section 3 - Configuration.
Configuration incorrect: Fix configuration
Configuration correct: Go to Step 2.
Output impedance must be less than or equal
to 1000 ohms.
Change Output Set Up group function prompt
OUT ALG = CUR.
Make the Output Set up group function prompt
CO RANGE = 4–20
Go to Step 4
Change Options Set Up group function prompt
CUR2 OUT = OUTPUT
Make the Current #2 Options Set up group
function prompt CO RANGE = 4–20
Go to Step 4
Troubleshooting/Service
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