Maintenance - Lincoln Electric INVERTEC 270SX Service Manual

WARNING
ELECTRIC SHOCK can kill
Have an electrician install and service this equipment
Turn the input power off at the fuse box before working on
equipment
Do not touch electrically hot parts
Prior to performing preventive maintenance, perform the
following capacitor discharge procedure to avoid electric
shock

MAINTENANCE

INPUT FILTER CAPACITOR
DISCHARGE PROCEDURE
1.
2.
3.
4.
5.
6.
DC-
INPUT BOARD - Figure 1
Showing 270SX input board
Page9
Remove input power to Invertec
machine
Remove the cover following the instruction available in
this Service manual.
Obtain a high resistance and high wattage resistor ( 25-
1000 ohms and 25 watts minimum ). This resistor is
NOT supplied with the machine. NEVER USE A
SHORTING STRAP FOR THIS PROCEDURE.
Locate the two terminals DC+ and DC – on the input
board. See Figure 1
Use electrically insulate gloves and insulated pliers.
Hold the body of the resistor and connect the resistor
leads across the two terminals. Hold the resistor in place
for 10 seconds. DO NOT TOUCH CAPACITOR
TERMINALS WITH YOUR BARE HANDS.
Check the voltage across the two terminals. Voltage
should be zero. If any voltage remains, repeat this
procedure.
®
270SX and 400SX
DC+