Welder User Manual

TROUBLESHOOTING & REPAIR
F-66 F-66
POWER WAVE 455/R
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STT CURRENT TRANSDUCER
REMOVAL AND REPLACEMENT (CONTINUED)
6. With the 5/16” open end wrench, remove
the small screw from the STT output termi-
nal. Label and remove the small leads.
See the Wiring Diagram.
7. Using the 3/4” wrench, remove the bolt,
lock washer and flat washer from the STT
output terminal. Remove the double heavy
output leads. Cut any necessary cable
ties.
8. Using the phillips head screw driver,
remove the screws and lock washers that
hold the transducer to the front panel.
9. Remove the STT current transducer, care-
fully feeding the output leads through it.
10. Remove the standoffs from the transducer
and save them for reassembly with the new
transducer.
REPLACEMENT PROCEDURE
1. Attach the standoffs to the transducer.
2. Position the transducer on the back of the
front panel and attach it with the two
phillips screws and lock washers. Feed the
output leads through the transducer.
3. Attach the double heavy leads to the STT
output terminal with the 3/4” bolt, lock wash-
er and flat washer.
4. Attach the small leads to the STT output ter-
minal with the 5/16” screw.
5. Install the resistor assembly using the 5/16”
socket wrench, extension and universal
adapter. Install the glastic high voltage pro-
tection shield with the 3/8” nut driver.
6. Replace all cable ties cut during removal.
7. Install the case top and right side using the
3/8” nut driver.