Acceleration Setting

OPERATION

B-13

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The LN-7 GMA can be configured for optimum starting for different procedures by selecting between two speeds of controlled wire acceleration. As shipped from the factory, the LN-7 GMA models are set for fast acceleration. Fast acceleration is typically the best for most smaller wire procedures. Slow acceleration may be more desirable for long stickout applications, or if a larger diameter electrode is being used.

Acceleration is set on the control PC board. To gain access to the control PC board, make certain the input power is off and remove the side cover on the control side of the LN-7 GMA. To change the acceleration on earlier control PC boards, reconnect the jumper to “F” (Fast) or “S” (Slow). Later control PC boards use a DIP switch (S101). S101 has 8 circuits (switches); only circuit #1 is used. Set circuit #1 in the “F” position for fast acceleration or in the “S” position for slow acceleration. See Figure B.7.

FIGURE B.7 – ACCELERATION SETTING

(LATER CONTROL PC BOARDS).

S101

UNUSED

CIRCUITS

CIRCUIT #1

F S

WIRE SPEED AND VOLTAGE ADJUSTMENT

Use only constant voltage power type sources. If using a multiple process power source, be sure it is set for constant voltage output per instructions in the manual for the power source.

Set the power source polarity switch or properly connect the electrodes and work leads for the correct electrode polarity. If the wire feeder is equipped with an optional meter kit, set the meter polarity switch to the proper working polarity.

Set the voltage using the control on the power source or the optional remote voltage control, if used. Set the open circuit voltage to approximately 2 volts higher than the desired procedure voltage. The final setting must be made according to the arc voltage while welding.

The wire speed control on the front of the wire feeder, Figure B.8, has a dial that is calibrated directly in inches per minute. Set the control for the desired procedure wire speed.

Lincoln Electric SVM 106-A service manual Acceleration Setting, Wire Speed and Voltage Adjustment

Models: SVM 106-A

OPERATION