Owner`s manual
OM-253 906 Page 76
7-6. Removing Right Side Panel and Measuring Input Capacitor Voltage
! Turn Off welding power
source, and disconnect
input power.
! Significant DC voltage can
remain on capacitors after
unit is Off. Always check the
voltage as shown to be sure
the input capacitors have
discharged before working
on unit.
Turn Off welding power source, and
disconnect input power.
1 Right Side Panel
To remove panel, remove screws
securing panel to unit.
2 Relinking Board PC10
3 Voltmeter
Measure the dc voltage across the
screw terminals on PC10 as shown
until voltage drops to near 0 (zero)
volts.
. If the capacitor voltage does
not drop to near zero after
several minutes, use a bleeder
resistor of between 25 and
1000 ohms, at least 5 watts,
#16 AWG 1000 volts DC
insulating rating wire to
discharge the capacitor(s).
4 Typical Bleeder Resistor
An example of a typical bleeder
resistor is shown on this page.
Proceed with job inside unit. Reinstall
right side panel when finished.
Tools Needed:
5/16 in.
Ref. 805 142-A / Ref. 805 145-A
2
3
+ lead to lower right terminal, −
lead to upper right terminal
1
4
Typical Bleeder Resistor
#16 AWG 1000 volts
DC insulation rating,
approx 3 in. (76 mm)
leads
25 to 1000 ohm, 5
watt resistor