Verification Of No-Load Voltage (Ocv) - Thermal Arc ARCMASTER 200 S Service Manual

5.7 Verification of No-load Volt-
age (OCV)
CAUTION
Before performing any portion of the procedure
below, make certain the unit is placed in the initial
set up condition as described at the beginning of
an above section "1.Preparation". Refer to section
11.4-1.
a) Verify the no-load voa in STICK mode.
1) In STICK welding mode, mark and then
turn potentiometer VR1 on PCB4 (WK-
5449) all the way to the right and turn off
the electric shock protector function (Volt-
age-Reduction-Device, VRD).
Refer to section 9.
WARNING
Electric shock hazard. The unit will generate OCV
immediately when Process mode is put into the
state of on pushing Process button at STICK mode.
2) Verify the no-load voltage using a DC volt-
meter. (The capability of the voltmeter
should be more than 100VDC.)
3) The normal no-load voltage is approxi-
mately 65V.
11
200S
11 – 12
ADVANCED TROUBLESHOOTING