Thermal Arc PRO-WAVE 300 TSW, Service Manual

Page: 68 / 110

PRO-WAVE 300TSW
7-6 August 10, 2005
F. Poor IGBT Q3, Q4
Gate Driver
Connections between
PCB5 (WK-4919) and
PCB11 (WK-4963).
F. Check wiring and connections for Q3, Q4 Gate
Driver signals between connector CN3 on
PCB5 (WK-4919) and connector CN3 on PCB11
(WK-4963) are connected firmly.
G. Secondary
Connections
G. Check connections are tight and are not burnt or
cracked on output terminals, transformer,
IGBT’s, secondary diodes, inductor, coupling coil.
H. Current Transformer
CT1.
H. Replace Current Transformer CT1 if damaged.
Check wiring and plug connectors at CT1 and
CN13 on PCB2 (WK-4983) are firmly connected.
I. Secondary Diodes
D2, D3, D4, D5, D6
are short circuit or
open circuit.
I. Check Secondary Diodes D2, D3, D4, D5, D6.
Refer to section 18. Replace if values
are not obtained.
J. Defective IGBT Q1,Q2. J. Check IGBT Q1, Q2.
K. Defective IGBT Q3,Q4. K. Check IGBT Q3, Q4.
L. Power Supply
Voltages are not
present at PCB2 (WK-
4983) and/or PCB5
(WK- 4919).
L. Check Power Supply Voltages are present at PCB2
(WK-4983) and connector CN1 on PCB5
(WK-4919). If not present replace PCB2 (WK-
4983). Refer to section for PCB2 Power Supply
Voltages and section for PCB5 (WK-4919) Power
Supply Voltages.
A. The Machine is in
Stick Mode.
A. Switch to either Lift Tig or HF Tig Mode.
B. Torch Trigger switch
lead is disconnected
or switch/cable is
faulty.
B. Reconnect Trigger switch lead or repair faulty
switch/cable.
C. Gas hose C. Check that gas hose is firmly connected into the
fitting at the inlet and outlet. Confirm that
the layout of the gas hose so that it is not bent or
kinked. Confirm there are no breaks, burns
or holes in the hose.
D. Gas Solenoid valve is
blocked.
D. Remove any obstructions from the Gas solenoid
valve.
E. Poor electrical
connection to
solenoid.
E. Make sure that the quick-disconnect terminals are
connected firmly at solenoid. Check wiring
and plug connector at CN12 at PCB2 (WK-4983)
are firmly connected.
Remedy Problem
3. No Gas flow
when torch
trigger is
depressed
but the
Cooling Fan
is rotating.
Possible Cause