Section 6 Troubleshooting - ESAB 653 cvcc Instruction Manual

SECTION 6
WARNING
1. Tighten the bolts evenly until finger tight noting that the nuts are not rotating.
2. Tighten the bolts 3/4 turn plus an 1/8 turn using a socket wrench on the bolt heads and rotating only in 1/4 turn incre-
ments plus 1/8 turn alternating between the bolts noting that the nuts are not rotating.
All voltage readings are taken with the front access panel open and the power switch "ON".
ELECTRICAL SERVICE AND REPAIR SHOULD BE ATTEMPTED ONLY BY
A TRAINED ELECTRICIAN.
Table 6-1. PCB Voltage Tests*
FROM
P8-5
P8-7
P6-6 (SCR1)
P6-5 (SCR2)
P6-4 (SCR3)
P6-3 (SCR4)
P6-2 (SCR5)
P6-1 (SCR6)
* Refer to Schematic Diagram
** Varies with VCP (R1)
TO READING
OTB+ +10 V dc
OTB+ 0-10 V dc**
OTB+ .3 V dc with
contactor on
NOTE:
36
TROUBLESHOOTING