Lincoln Electric LN-25 SVM114-C - Manual (Page 48)

TROUBLESHOOTING AND REPAIR F-10 F-10
LN-25™
SOLENOID PC BOARD
1. Apply at least 25 VDC but no more than 100
VDC to the LN-25™ from the electrode cable to
the work sensing lead. Make sure the polarity
sw i t c h i s s e t t o m a t c h t h e p o l a r i t y o f t h e
electrode cable. For example, if the electrode
cable is positive and the work sensing lead is
negative, set the polarity switch to positive. See
Figure F.3.
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GAS SOLENOID VALVE AND SOLENOID PC BOARD TEST
(continued)
FIGURE F.3 – APPLIED VOLTAGE POLARITY.
ELECTRODE CABLE
POLARITY
SWITCH
WORK
SENSING LEAD