Intelligent Technologies (
IT.
) D77B-DSNAP
Pub. No. MN05004001E
29
September 2002
Troubleshooting
Table 24: Troubleshooting
Observation
Possible Cause
Corrective Action
MS/NS LED flashing red after
power-up
D77B-DSNAP is not
communicating to the
IT. Starter
Check the D77B-RJJ1 jumper
between the D77B-DSNAP and
the D77B-TC8 terminal adapter.
Also check that the terminal
adapter is properly secured and
plugged into the
IT. Starter.
The D77B-DSNAP was
configured or “married” to
another
IT. Starter
Perform a reset (Appendix A
Page 30) to re-marry the
D77B-DSNAP to the
IT. Starter.
The D77B-DSNAP is powered but
the
IT. Starter is not
Power the
IT. Starter.
The MS/NS LED starts flashing
green and then turns to a
flashing red after power-up
D77B-DSNAP is not
communicating to the
IT. Starter
Check the D77B-RJJ1 jumper
between the D77B-DSNAP and
the D77B-TC8 terminal adapter.
Also check that the terminal
adapter is properly secured and
plugged into the
IT. Starter.
IT. Starter will not energize
IT. Starter is not powered
Verify that the
IT. Starter has 24V
DC on the + and - of the terminal
block, the Power LED should be
green on the D77B-TC8 terminal
adapter.
IT. Starter may be tripped
Reset the trip.
Improper bit set in output
assembly
Check the output assembly data
position and verify with the
control logic.
Second Contactor will not
energize
During the “marriage” the wrong
configuration was detected
Verify that the product code
(Table 27 instance 3) is 0x1102
(4354 dec.). If the product code is
not correct, verify that the second
contact sensor is installed and
wired, that the
IT. Starter is
powered and perform a Reset
to Out of Box (Appendix A,
Page 30).
Improper bit set in output
assembly
Check the output assembly data
position and verify with the
control logic. Verify the correct
output assembly is being used.
Mechanical interlock is jammed
The primary contactor is already
energized
Only one contactor can be
energized at a time.
A “failed to close” fault is
generated when the second
contactor is energized
The wiring between the D77B-A2
and the D77B-DSNAP is faulty.
Verify all connections on the
D77B-A2 and the D77B-DSNAP.
Verify that the D77B-A2 is
properly connected to the second
contactor.