Thermal Arc ARCMASTER 200 TS, Service Manual

Page: 50 / 96

200TS
11
ADVANCED TROUBLESHOOTING
11 – 8
4
Fault Isolation Tests
4.1 Preparation
The following initial conditions must be met prior to
starting any of the procedures in this section.
1) Connect the appropriate input voltage.
(Check the name plate on the rear of the power
supply for the proper input voltage.)
NOTE
Operate at ALL input voltages as noted on the
nameplate on the rear panel when testing the
power supply.
2) Remove the Side Panel. Refer to the section
11.1.1.
3. Close primary power source wall disconnect
switch or circuit breaker.
4) Place power supply MAIN CIRCUIT SWITCH
(S1) on rear of unit in the ON position.
WARNING
Dangerous voltage and power levels are present
inside this unit. Be sure the operator is equipped
with proper gloves, clothing and eye and ear pro-
tection. Make sure no part of the operator's body
comes into contact with the workpiece or any inter-
nal components while the unit is activated.
5
Verification of the Power
Input Circuitry
CAUTION
Before performing any portion of the procedure
below, make certain the unit is placed in the initial
set up condition as described
in section 11.4.1
"Preparation".
5.1 Verification of the AC input
voltage using an AC voltmeter
1) Verify input voltage (Phase-to Phase) using an
AC voltmeter. (The capability of the voltmeter
should be more than 600VAC). Measure the
point between lines U1 and V1 on the input
switch, S1.
The location of points U1 and V1 on switch S1
are indicated in Figure 11-7.
Figure 11-7: Check points U1, U2, V1 and V2
2) If the input voltage is out of the operating range
of the unit, which is ±10% (207~253VAC) of
the rated voltage (230V), verify the available
power capacity at the installed site.
If the input voltage is within the operating
range, recheck the input voltage while welding,
as welding may cause the input voltage to
decrease to a value below the operating range
of the unit.
3) Verify input voltage after the input switch (S1)
using an AC voltmeter. (The capability of the
voltmeter should be more than 600VAC.)

Using an AC voltmeter, measure between the
U2
V2
U1
V1