Lincoln Electric SVM179-B service manual Routine Maintenance, Periodic Maintenance

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D-2			MAINTENANCE		D-2
SAFETY PRECAUTIONS				5. Energize the output circuit of the power source.
		WARNING		Adjust the power source output to 20±1 VDC as
				measured on the reference meter.
ELECTRIC SHOCK can kill.				6. Verify that LN-25™ PRO voltmeter reads between
	• Do not operate with covers
	removed.			19 and 21 volts.
	• Turn off power source before			If the voltmeter reading is out of range, check for loose
	installing or servicing.
	• Do not touch electrically hot			connections or replace the voltmeter. There is no cal-
	parts.			ibration adjustment for the LN-25™ PRO voltmeter.
• Turn the input power to the welding power				Flow Meter Validation
source off at the fuse box before working in the
terminal strip.
• Only qualified personnel should install, use or				Tools required:
service this equipment.
----------------------------------------------------------------------				• Flow meter reference standard.
ROUTINE MAINTENANCE				• Constant voltage DC welding power source (DC-
				400, V-350, CV-400 or equivalent).

• Check weld cables and gas hoses for cuts.	To verify the flow meter accuracy:
• Clean and tighten all weld terminals.
PERIODIC MAINTENANCE	1. Turn power OFF.

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•Clean drive rolls and inner wire guide and replace if worn.

•Blow out or vacuum the inside of the feeder.

CALIBRATION SPECIFICATION

The voltmeter and flow meter are not calibrated and are for reference purposes only.

Voltmeter Validation, Across the Arc Analog Meter Models

Tools required:

•DC voltmeter reference standard

•Constant voltage DC welding power source with adjustable no-load voltage (DC-400, V-350, CV-400 or equivalent).

To verify the analog voltmeter accuracy:

1.Turn power OFF.

2.Connect the LN-25™ PRO to the constant voltage DC welding power source. The work lead of the LN-25™ PRO must be connected to the work ter- minal of the power source.

3.Connect the reference voltmeter between the brass block of the LN-25™ PRO and the work lead.

4.Turn power ON.

2.Connect the LN-25™ PRO to the constant voltage DC welding power source. The work lead of the LN-25™ PRO must be connected to the work ter- minal of the power source.

3.Connect a supply of CO2 to the wire feeder. Do not exceed the maximum inlet pressure of the wire feeder.

4.Disconnect the shielding gas hose that connects to the gun bushing.

5.Connect the shielding gas hose to flow meter refer- ence standard.

6.Orient the LN-25™ PRO in a vertical position.

7.Turn power ON.

8.Adjust the flow meter on the LN-25™ PRO to 40 scfh while pressing the GAS PURGE button.

9.Measure the gas flow with the calibrated flow meter while pressing the GAS PURGE button.

10.The measured flow rate should be between 35 and 45 scfh.

The LN-25™ PRO flow meter cannot be calibrated. If the flow meter reads incorrectly, check for leaks or kinks in the gas hose. Replace the flow meter if neces- sary.

LN-25™ PRO