OM-219 Page 19
4-2.
Removing Case And Discharging Input And Output Capacitors
Y
Significant DC voltage can
remain on capacitors after
unit is Off. Always discharge
capacitors as shown to be
sure they have discharged
before working on unit.
Turn Off welding power source and
cutter, and disconnect input power
and input air hose. Stop engine on
welding generator.
1
Bleeder Resistor (Not
Supplied, Part No.172 264)
Obtain or construct bleeder resistor
with specifications shown. Lead
connections must be soldered to
resistor.
2
Top Of Case
3
Guards
4
Bolts
5
Nuts
Remove top of case as shown.
6
Input Capacitors C1, C2
Peel back vinyl coating covering
capacitor terminals. Connect
bleeder resistor across terminals of
one capacitor, and wait for at least
10 seconds.
Repeat procedure for remaining ca-
pacitor.
7
Output Capacitor Discharge
Terminals
Peel back vinyl coating covering
capacitor terminals. Connect
bleeder resistor across discharge
terminals, and wait for at least 10
seconds. Remove bleeder resistor.
8
Bottom Of Case
To remove bottom of case, discon-
nect wiring harness of arc start
board (see Parts List, Section 7).
After task is complete, reconnect
harness (if needed), cover capaci-
tor terminals with suitable vinyl
coating, and reinstall case.
Tools Needed:
1
6
4
3
2
3
5
8
7
3/8, 7/16 in
Ref. ST-800 870-A
Bleeder Resistor
Specifications
Approx.
3 in
(76 mm)
Leads
5 Ohms, At Least 50 Watts,
#16 AWG 600 Volts DC
Insulation Rating
Summary of Contents for Spectrum Plus
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Page 33: ...OM 219 Page 29 Notes...
