Miller XT30C Owner's Manual - Page 31

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Miller XT30C Owner's Manual

6-5. Troubleshooting Power Source

Is input power
connected to
correct
line
voltage?
Yes
Is Changeover
switch S2 in
the 115V or
230V position?
Yes
Does the breaker
Yes
trip when unit is set
on 115V?
No
Is Power switch
S1 in the On
position?
Yes
Is the cooling
fan running?
Yes
Yes
Is Power light
flashing?
No
.
A complete Parts List is available at www.MillerWelds.com
Connect unit to proper input
No
voltage (see Section 4-10).
Place Changeover switch in
No
proper position for input
voltage (see Section 4-10).
Turn down output current.
(see Section 5-1).
No
Place Power switch in the
On position. (see Section
5-1).
*
No
Check Power switch S1 and
relay CR2 and thermistor R2
on PC2. Replace PC2 if R2
or CR2 are not functioning
correctly.
*
Reset Power switch S1
and verify line power
voltage (see Section 4-1).
Check
relay
CR2,
thermistor R2 on PC2,
and Control board PC1.
Yes
Is Cup Status
light On or
flashing?
No
Yes
Is Temp Status
light On?
No
Yes
Is Pressure Status
light On or flashing?
No
No
Does pilot arc
ignite?
Yes
No
Does pilot arc
transfer
to
workpiece?
Yes
Check
all
connections,
Check main transformer T1,
Check boost inductor L1
and buck inductor L2.
Return to beginning of chart.
Check torch consumables.
Reset Power switch S1.
If unit is overheated, wait
while fan cools down unit
temperature.
*
Turn Output control
fully counterclockwise (see
Section 5-1). Check for
gas/air flow at torch. Check
Control
board
PC1,
pressure switch S3 (gauge),
air filter, valve AS1, and air
supply connection to unit
and torch.
Press torch trigger and
check if pilot arc ignites.
Check torch consumables.
*Check torch connections,
air filter, pressure switch S3,
valve
AS1,
air
supply
connection to unit, torch,
and PC1.
Place torch near workpiece
and check if pilot arc "jumps"
or transfers to workpiece.
Check
work
clamp
connection. *Check Control
board PC1 and connections,
and torch and its connections.
*Servicing procedure to be
performed only by authorized
Service Station.
OM-255 590 Page 27