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4-3.
Circuit Breakers And
Fuses
Tools Needed:
cE~zJ=in
3/8 in
Turn Off
welding
power
source,
disconnect
input
power, and check
voltage
on
input capacitors
ac
cording
to
Section
4-2
before
proceeding.
1
Circuit Breaker CB1
If
CB1
opens,
remote
devices
using
115 volts from Remote 14
receptacle
stop.
Manually
reset
CB1.
2
Circuit Breaker CB2
If
CB2
opens,
remote
devices
using
24 volts from
Remote
14
receptacle
stop.
Manually
reset
CB2.
3
Circuit Breaker CB3
If
CB3 opens, devices
connected
to
the 115 volt twistlock
receptacle
stop.
Manually
reset
CB3.
4
Fuse Fl
Fl
protects
the control
circuitry
from overload. If Fl opens, the
welding
power
source
shuts down.
5
Fuse F3
6
Fuse F4
F3 and F4
protect
Control Board
PCi. If
either fuse opens,
remote
control
devices
connected
to
Remote 17
receptacle
RC1 may
shut down.
See Parts List for fuse
ratings.
Use
proper tool when
removing
fuses.
ST.800 768-Al
Ref. sT-i
52
069-C/ST-i
50
173-C
OM-167
302
Page
12
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Troubleshooting
