WTC MedWeld 5000, Technical Reference Manual

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Hardware Troubleshooting
9 - 8 MedWeld 5000 Technical Reference Manual
M-032170
Isolation con-
tactor not being
pulled in
The weld schedule does not contain
the function to activate the isolation
contactor (Function #88).
Check the weld schedule to confirm that it
contains Function #88.
The isolation contactor is driven by a
single solid-state relay (based on the
status of the CONTROL STOP and
WELD/NO WELD inputs). Voltage
must be present at these inputs to
allow the timer unit to open or close
the isolation contactor.
Use the I/O Status display on the DEP-
100S to verify that the inputs are HIGH
(= 1).
The solid-state relay is faulty. Replace solid-state relay.
If the control is externally-powered,
one of the internal control transformer
fuses may be blown.
Check fuses. Replace as necessary.
The control was unable to pull in the
isolation contactor due to incorrect or
loose wiring to the output module.
Check the wiring diagram that came with
your control for proper I/O designations.
Make sure all connections are secure.
Isolation contactor is not being held in
between weld sequence.
Check the I/O point enabling the
ISOLATION CONTACTOR SAVER Input.
Check the setting of the Isolation
Contactor Delay setup parameter.
Faulty timer module. Replace timer module.
No current
reading (10 A. or
less)
Did the control weld? If NO , check the weld schedule.
If YES , check for part fit-up, foreign
material between electrodes and work
piece, electrode pressure and tooling.
Problem Possible Cause Possible Solution