Lincoln Electric SVM135-B service manual Power Feed Controls, STEP/4-STEP Switch Operation

B-4 OPERATION B-4

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Light
Condition	Meaning
Steady Green	System OK. Power source communicating
	normally with wire feeder and its
	components.
Blinking	Nothing connected to Wire Feeder
Green	Receptacle.
Alternating	Recoverable system fault. See
Green and	Troubleshooting Section.
Red
Steady Red	Non-recoverable system fault. Must turn
	power source off, find source of error, and
	turn power back on to reset. See
	Troubleshooting Section.
Blinking Red	See Troubleshooting Section.

3.HIGH TEMPERATURE LIGHT (thermal overload): A yellow light that comes on when an over tem- perature situation occurs. Output is disabled until the machine cools down. When cool, the light goes out and output is enabled.

4.10 AMP WIRE FEEDER CIRCUIT BREAKER: Protects 40 volt DC wire feeder power supply.

5.10 AMP AUXILIARY POWER CIRCUIT BREAK- ER: Protects 115 volt AC receptacle.

POWER FEED CONTROLS

1. 2-STEP/4-STEP SWITCH OPERATION

The Power Feed head unit has a 2-Step/4-Step switch shown in Figure B.2. This switch has no effect in CC modes of operation such as stick weld- ing. When in the 2-step position, the gun trigger func- tions as follows:

FIGURE B.2 — WIRE FEEDER CONTROLS.

CONTROL BOX

(SHOWN ATTACHED

TO WIRE FEEDER)

2. COLD FEED/
GAS PURGE	COLDFEED
SWITCH
	STATUS	4-STEP

2-STEP

3.STATUS

LIGHT 1. 2-STEP/ 4-STEP SWITCH

When the switch is in the 4-step position, the gun trigger functions as follows:

4-Step Operation (Current interlock):

1.Closing trigger initiates gas preflow time followed by run in speed and strike voltage until welding current is established.

2.Once current is established, the trigger may be released and welding will continue.

3.When the trigger is closed again, welding will continue but the current interlock function will be disabled.

4.Releasing the trigger stops the wire feed and ini- tiates burnback followed by gas postflow.

2-Step Operation: 2. COLD FEED/GAS PURGE SWITCH

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1.Closing the gun trigger initiates gas preflow time followed by run in speed and strike voltage until welding current is established.

2.Opening the gun trigger during a weld stops wire feed and initiates burnback time, followed by gas postflow time.

The Power Feed head unit has a Cold Feed/Gas Purge switch. When left untouched, this switch returns to a center position where no action results.

POWER WAVE 455/POWER FEED 10