Troubleshooting - Miller Electric Dimension 652 Owner's Manual

6-4. Troubleshooting

Trouble
No weld output; unit completely
inoperative; pilot light PL1 off.
No weld output; power switch pilot light
on.
No weld output; power switch pilot light p p p
on; fan off. fa ff
Limited weld output and low
open-circuit voltage.
Unit provides only maximum or
minimum weld output.
Not able to obtain minimum output in
CC mode.
Erratic or improper weld output.
No 115 volts ac output at duplex recep-
tacle, or Remote 14 receptacle.
No 24 volts ac output at Remote 14 re-
ceptacle.
Fan not operating. Note: fan only runs
when cooling is necessary.
Wandering arc; poor control of arc
direction.
Tungsten electrode oxidizing and not
remaining bright after conclusion of
weld.
Digital meter not working properly.
Place line disconnect device in On position (see Section 4-18).
Check for open line fuse(s), and replace if open (see Section 4-18).
Check for proper input power connections (see Section 4-18).
Check for proper jumper link position (see Section 4-17).
Check fuse F1, and replace if necessary (see Section 6-2).
Unit overheated. Allow unit to cool with fan On (see Section 4-2).
If using remote control, place Output (Contactor) switch in Remote 14 position, and connect remote
control (see Sections 4-14 and 4-15). If remote is not being used, place switch in On position (see
Section 5-1).
Check, repair, or replace remote control.
g Check for proper input power connections (see Section 4-18).
Check for open line fuse(s), and replace if open, or reset circuit breaker (see Section 4-18).
Turn power switch off then back on. If no output condition remains, have Factory Authorized Service
agent check SCR's.
Check position of Remote Amperage/Voltage Control switch (see Section 5-1).
Check for open line fuse(s), and replace if open (see Section 4-18).
Check for proper input power connections (see Section 4-18).
Check for proper jumper link position (see Section 4-17).
Clean and tighten all weld output connections.
Have Factory Authorized Service Agent check control board PC1 and hall device HD1.
Check position of Remote Amperage/Voltage Control switch (see Section 5-1).
Use high inductance weld output terminal when in CC mode to obtain minimum output (see Section
4-9).
Use proper size and type of weld cable (see Section 4-9).
Clean and tighten all weld connections.
Check wire feeder installation according to Owner's Manual.
Check position of Process selector switch (see Section 5-1).
Have Factory Authorized Service Agent check control board PC1 and hall device HD1.
Reset supplementary protector CB1 (see Section 4-7).
Reset supplementary protector CB2 (see Section 4-7).
Check for and remove anything blocking fan movement.
Have Factory Authorized Service Agent check fan motor.
Reduce gas flow rate.
Select proper size tungsten.
Properly prepare tungsten.
Shield weld zone from drafts.
Increase postflow time.
Check and tighten all gas fittings.
Properly prepare tungsten.
Check for water in torch, and repair torch if necessary. See torch Owner's Manual.
Have Factory Authorized Service Agent check control board PC1 and connections, and replace if
necessary.
.
A complete Parts List is available at www.MillerWelds.com
Remedy
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