Miller Electric WC-115A - Manual (Page 22)

OM-1078 Page 18
5-1. Overload Protection
Ref. 144 451-D / Ref. 800 185-A
If fuse F1 opens, the weld control
shuts down. To check or change
F1, proceed as follows:
1
Fuse Holder Cover
2 Fuse (See Parts List For Fuse
Size)
1 2
Push And Turn Pull Out And
Replace F1
Push And Turn
5-2. Troubleshooting
Trouble Remedy
Pressing gun trigger does not energize
weld control or welding wire.
Secure plug PLG4 in 115 volts ac receptacle (see Sections 3-7 and 3-8).
Secure gun plug in Gun Control receptacle RC3 on weld control (see Section 3-4).
Check fuse F1 and replace if necessary (see Section 5-1).
See Troubleshooting Section of gun and/or welding power source Owner’s Manual.
For models without optional contactor
control: Pressing gun trigger feeds
Secure plug PLG5 in 14 pin receptacle on welding power source (see Section 3-9).
control: Pressing gun trigger feeds
wire but does not energize welding
wire.
See Troubleshooting Section of welding power source Owner’s Manual.
For models with optional contactor
control: Pressing gun trigger feeds
wire but does not energize welding
wire.
See Troubleshooting Section of welding power source Owner’s Manual. Check contactor visually for
closure.
Pressing gun trigger energizes wire,
but wire does not feed.
See Troubleshooting Section of gun Owner’s Manual.
Erratic weld output. Secure plug PLG4 in 115 volts ac receptacle (see Sections 3-7 and 3-8).
Secure gun plug in Gun Control receptacle RC3 on weld control (see Section 3-4).
Secure plug PLG5 in 14 pin receptacle on welding power source (see Section 3-9).
See Troubleshooting Section of gun and/or welding power source Owner’s Manual.
Wire feeds erratically. See Troubleshooting Section of gun Owner’s Manual.
Wire feed speed does not switch from
run-in speed to weld wire feed speed.
Check reed relay, and replace if necessary. Check that weld cable is routed through reed relay.
Wire feeds, but burns back. Readjust ramp-up speed potentiometer R70 on motor control board PC1 (see Section 3-5).
No gas flow. Check gas hose and connections, and replace if necessary (see Section 3-4).
Wire does not feed, and is not
energized on CC welding power
sources.
Connect voltage sensing lead to workpiece (see Section 3-5).