Lincoln Electric IM586-B manual Wire Reel Changing, Wire Feed Overload Protection

B-9 OPERATION B-9

WIRE REEL CHANGING

At the end of a coil, remove the last of the old electrode coil from the conductor cable by either pulling it out at the nozzle end of the gun or by using the following pro- cedure:

1)Cut the end of the electrode off at the gun end. Do not break it off by hand because this puts a slight bend in the wire making it difficult to pull it back through the nozzle.

2)Disconnect the gun cable from the gun connector on the STT-10 wire drive unit and lay the gun and cable out straight.

3)Using pliers to grip the wire, pull it out of the cable from the connector end.

4)After the electrode has been removed, reconnect the gun cable to the drive. Load a new reel of elec- trode per the instructions in “Wire Reel Loading” in this section.

WIRE FEED OVERLOAD PROTECTION

The STT-10 has solid-state overload protection of the wire drive motor. If the wire drive motor becomes over- loaded for an extended period of time, the protection cir- cuitry turns off the power source, wire feed and gas solenoid, and then displays “H30” on the WFS display (with blank Voltage display). This indicates the wire drive motor is overloaded and will remain shut down for about 30 seconds before the unit will automatically reset. The “H30” display decrements every second until it reaches “H00”. At that time, the unit resets automati- cally and the previous displays will return indicating the unit is ready to operate again. Overloads can result from improper tip size, liner, drive rolls, or guide tubes, obstructions or bends in the gun cable, feeding wire that is larger than the rated capacity of the feeder or any other factors that would impede normal wire feeding. (See “Avoiding Wire Feeding Problems” in the MAINTE- NANCE section).

GROUNDING LEAD PROTECTOR

The frame of the STT-10 Control is grounded to the frame of the power source by a lead in the control cable. An overload protector prevents welding current from damaging this lead if the electrode circuit touches the wire feeder frame while the electrode is electrically hot.

If such a grounding lead fault occurs, the WFS display will show “GLP,” (with blank Voltage display) and the trigger circuit will be disabled. To reset the circuit, release the trigger, make sure that the electrode is not touching the wire feeder frame, and then either press any key on the keypad or close the trigger. When the GLP circuit is reset, the “GLP” display is removed and the wire feeder is returned to normal operating mode.

EXPLANATION OF PROMPTING AND ERROR MESSAGES

Display	Prompt or Error
Acc	Displayed on top display, indicates WFS
	display is showing acceleration setting, “1"
	to “5" (See “Acceleration Selection” in this
	section).
SEC	Displayed on WFS display, indicates
	Voltage display is showing a Timer setting
	in seconds. (See “Display Control Keys” in
	this section)
GLP	Displayed on WFS display, indicates that
	the Grounding Lead Protector circuit was
	activated due to excessive current flow into
	the wire feeder frame. When the GLP cir-
	cuit is activated the wire feeder is disabled
	(the trigger output to the power source is
	opened up, the motor is stopped, and the
	gas solenoid is turned off). To resume nor-
	mal operation, release the trigger, make
	sure that the electrode is not touching the
	wire feeder frame, and then either press a
	key on the keypad or close the trigger.
	(See “Grounding Lead Protector” in this
	section)
Cld	Displayed on top display when Cold Feed
	Forward or Cold Feed Reverse Key is
	pressed, or Cold Feed Trigger mode is
	selected. Indicates wire is fed “cold” (no
	weld voltage) at the speed indicated on the
	WFS display. (See “Operation Keys” and
	“Trigger Mode Selection” in this section).

---Displayed on bottom display with RUN-IN selected, indicates setting will match those set for Wire Feed Speed (See “Display Control Keys” in this section).

HXX	Displayed on WFS display, indicates wire feed over-
	load. XX indicates time remaining in seconds before
	unit resets automatically. (See “Wire Feed Overload
	Protection” in this section and “Avoiding Wire
	Feeding Problems” in the MAINTENANCE section).
Er	EEPROM error. Usually occurs at power-up.
	Indicates one or more of the recalled settings is out
	of acceptable limits. Press any key to return to nor-
	mal operation. Be sure to check all current, wire
	feed speed, acceleration and timer settings before
	you proceed.

STT-10