Trouble Shooting (continued)
Safety relay board
shorted
Remove wire T-61 from the safety relay board and ensure
the wire is not touching anything. It will have 24vdc supplied
to the wire. Try and start machine with T-61 disconnected. If
machine starts up check all items on that circuit to find what
is shorted; it the machine does not start up go to step 2.5
Power supply shorted.
Reconnect wire T-61 and then remove the following wires one
at a time and check if machine starts with each wire removed.
If the machine starts with one of these wires disconnected,
troubleshoot that circuit to find the short. T86, T85, T62, T63,
T64, T65, T66, T67. Also pull relays R1, R2, R3, R6, K6 AND K9. If
none of the wires or relays while disconnected allow the
machine to start up, then change out the safety relay board.
Check to ensure 24vdc is coming out of power supply. While
the meter is still hooked up, depress the start button and if
voltage drops low ( 1-7vdc ) change out power supply.
This next section deals with fuses blowing. Typically the problem is with a component shorted to ground.
The trouble shooting method involves disconnecting wires to isolate components or electrical legs.
Please follow the procedure outlines and do not skip steps. Caution needs to be taken because some
wiring may be HOT. Ensure you have extra fuses and they are the correct AMP rating as the one
currently in use
PLC Fault or faulty
“Clean” transformer.
Remove wires T-4 and T-41 from the P.C board. Restore
power and check if F1 fuse blows. If it does then change out
the Clean 24vdc power supply unit. If it does not blow, go to
next step.
Reconnect wire T-4 and restore power. If F1 fuse blows, then
turn off power and reconnect T-41 and go to 3.2.1. If F1 fuse
does not blow then reconnect Wire T-4 and go to 3.3.1
E-Stop shorted or P.C
Board Shorted.
To isolate which leg on the E-Stop is shorted you will need to
pull the following Fuses. F3, F2 and F6. Turn power back on
to the machine and if F1 Fuse blows, Change out E-stop. If
F1 does not blow, Replace Fuse F3. Turn power back on and
if F1 Blows then follow the procedure for F3 fuse blowing. If
F1 does not blow replace F2 Fuse. If F1 fuse blows then
follow the procedure for F2 fuse blowing. If fuse does not
blow then replace fuse F6. If F1 fuse blows then follow the
procedure for F6 Fuse Blowing. If none of these solves the
problem to a root cause, then change out P.C Board.
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