Table 7-12 Troubleshooting A Communications Failure - Honeywell UDC3300 Product Manual

7.7 Troubleshooting Procedures,
Procedure #5
82
Table 7-12 explains how to troubleshoot a Communications failure.
Table 7-12 Troubleshooting a Communications Failure
Step What to do
1 Check the field wiring and
termination resistor.
2 Make sure the Communications
Printed Wiring Board is installed
properly in the controller.
3 Determine if the Communications
board is faulty by running a LOCAL
LOOPBACK TEST.
If the test fails, replace the board.
UDC3300 Limit Controller Product Manual
Continued
How to do it
Refer to the Installation section of
either the RS422/485 Manual or the
Gateway Manual depending on the
protocol used.
Withdraw the chassis from the case
and inspect the board. See the
exploded view (Figure 8-1) for location
of the board. Return the chassis to the
case.
Run the Local Loopback Test.
Press [SET UP] until you see:
Upper Display
SET UP
Lower Display
COM
Press [FUNCTION] until you see:
Upper Display
DISABL
Lower Display
LOOPBACK
Press s or t, you will see:
Upper Display
ENABLE
Lower Display
LOOPBACK
The test will run until the operator
disables it here.
1/01