Network And Module Status Leds; Troubleshooting - Miller Axcess 300 Owner's Manual

9-4. Network And Module Status LEDs

Network Status LEDs
A.
The following is a network status LED:
LED4 on the PCM circuit board.
Status
Off The circuit board is not on-line with the network or there is no power applied to the circuit board.
Green The circuit board is operating normally and the on-line connection is made with the network.
Flashing Green The circuit board is waiting for an on-line connection to be made with the network.
Red The circuit board has encountered a communication link failure with the network. Check DeviceNet cable connections.
Replace circuit board if necessary.
Module Status LEDs
B.
The following is a module status LED:
LED3 on the PCM circuit board.
Status
Off There is no power applied to the circuit board or the board software is not executing its functions.
Green The circuit board is operating normally.
Flashing Red The circuit board has encountered a recoverable fault. Wait or cycle power to clear fault.
Red The circuit board has encountered an unrecoverable fault.

9-5. Troubleshooting

Trouble
No weld output; completely inoperative
No weld output; meter display on with no
error displayed.
Erratic or improper weld output with no
errors displayed.
No 115 volts AC at the duplex
receptacle.
Wire does not feed.
Wire feeds erratically.
Wire feeds as soon as power is supplied. Check gun trigger. See gun Owner's Manual.
Wire stubbing on low end using a
constant current power source.
Gas does not flow or does not stop flow-
ing; wire feeds.
Wire burns back to gun contact tip when
using electrode negative
polarity) process.
Place line disconnect in On position (see Section 4-9 or 4-10).
Check and replace line fuse(s), if necessary, or reset circuit breaker
(see Section 4-9 or 4-10).
Check for proper input power connections (see Section 4-9 or 4-10).
Check to see if the contactor indicator light is lit when contactor line is asserted on.
Use proper size and type of weld cable (see Section 5-1).
Clean and tighten all weld connections.
Reset supplementary protector CB1.
Check supplementary protector CB2 and reset if necessary.
Check motor control cable connections.
Readjust hub tension.
Readjust drive roll pressure.
Clean or replace dirty or worn drive rolls.
Remove weld spatter around the nozzle opening.
Replace contact tip or liner. See gun Owner's Manual.
Check motor control cable connections.
Increase output setting of the power source.
Check voltage sense lead connection, clean and tighten if necessary.
Check gas valve and flow meter.
Check to be sure that volt sense lead is connected to the work.
(straight
Diagnosis
Diagnosis
Remedy
OM-216 967 Page 35