Miller Electric D-64 Troubleshooting, Disconnect power before troubleshooting, Trouble Remedy

6-2. Troubleshooting

		Y Disconnect power before troubleshooting
	Trouble	Remedy
Wire feeds, shielding gas flows, but elec-		Check interconnecting cord connections. If secure, check cord for continuity and repair or replace (see
trode wire is not energized.		Sections 4-3 and 4-4).
Wire feeder is on, meter(s) do not light		Check and reset CB1 (see Section 5-2).
up, motor does not run, gas valve and
welding power source contactor do not
pull in.
Electrode wire feeding stops or feeds er-		Check gun trigger connection. See gun Owner’s Manual.
ratically during welding.
		Check gun trigger. See gun Owner’s Manual.
		Readjust hub tension and drive roll pressure (see Section 4-9).
		Change to correct size drive roll (see Table 8-1).
		Clean or replace dirty or worn drive roll.
		Incorrect size or worn wire guides.
		Replace contact tip or liner. See gun Owner’s Manual.
		Remove weld spatter or foreign matter from around nozzle opening.
		Have Factory Authorized Service Agency check drive motor or motor control board PC1.
Motor runs slowly.		Check for correct input voltage.
Wire does not feed until trigger is pulled,		Check for a short between welding gun trigger leads and weld cable. Repair short or replace welding gun.
but continues to feed after trigger is re-
leased, and trigger hold is not on.
Gas valve in feeder is rattling loudly		Check for a short between welding gun trigger leads and weld cable. Repair short or replace welding gun.
along with possible erratic or slow wire
feed speed.
Unit does not switch out of Run-In		When using this unit with certain older style Miller CV power sources, a weld current sensor
Speed.		(Part No. 160 963) must be used. Power sources include the Deltaweld prior to Serial No. KG141349
		and the Dimension prior to Serial No. KC253517.
Wire feeder power is on, displays light		Check welding gun trigger leads for continuity, and repair leads or replace gun.
up, but unit is inoperative.
Schedule A Wire Feed Speed works, but		DIP Switch S1(1) on Option Interface Board PC70 must be in the On position (see Section 4-10).
Schedule B Wire Feed Speed does not
work or is erratic.
Wire Feed Speed Meter display does not		Set DIP Switch S2 on Meter Board PC60 in Inches/Minute mode (see Section 4-10).
match actual wire feed speed.
Actual arc voltage display on meter is		Set DIP Switch S2 on Meter Board PC60 in Voltage Monitor mode (see Section 4-10).
held after trigger is released, or arc volt-
age does not change while welding.

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