CUTMASTER 102
Manual 0-4998
SERVICE
5-19
J. Fans MOT 2 & MOT 3 do not turn ON after
START signal is activated.
1. Open connection between Main PCB 1 J13 to 40A PCB
5 J4.
a) Verify connectors are plugged in. Check continuity
.
b) Measure voltage at J4-2 to J4-10 on 40AMP PCB
5 for 12VDC. The voltage should drop to less than
2VDC after a START signal is active. If the 12VDC
is not present or does not drop to less than 2VDC
after a START signal is activated, then replace the
ribbon cable.
2. Defective 40AMP PCB 5
a) Measure the voltage between J1-1 to J1-2 on the
40AMP PCB 5 for 12VDC after the START signal is
activated. If 12VDC is present replace 40AMP PCB
5.
3. Defective Fans MOT 2 and 3.
a) If 12VDC is present on J1 and J2 connectors on
40A PCB 5, replace fans MOT 2 & MOT 3.
5.09 Main Arc and Controls Problems
A. Main arc will not establish, LED D59 on Main
PCB remains ON while pilot arc is striking the
work piece.
1. Work Cable not connected.
a) Connect cable to work piece
2. Work cable open / broken.
a) Check continuity of work cable. Insure connection
of cable to clamp is secure.
B. When Pilot Arc is brought to the work piece,
the arc goes out immediately or extinguishes
while cutting. ERROR indicator and 85 PSI
indicator flashing.
a) Ferrite filter on ribbon cable between J1 on Logic PCB
3 to J2 on Main PCB 1 is broken, loose or missing.
b) Ferrite on wire harness between J13 connector on Main
PCB 1 to J4 connector on 40A PCB 5 is broken, loose
or missing.
c) Wires SEC1 and SEC2 routed too close to component
U2 on 40A PCB 5. Re-route to space a least 1 inch
(25mm) away.
d) Older revision 40A PCB 5. Replace if PCB 5 revision is
"AC" or earlier.
C. Main arc transfers but current cannot be
adjusted.
1. Defective Logic PCB 3.
a) While main arc is transferred,measure voltage on
Main PCB between test points GND1 to I_DMD1.
b) Adjust CURRENT CONTROL POTENTIOMETER
from maximum to minimum. Voltage should vary
from 4VDC at max to 1 VDC at min
If voltage does not vary with CURRENT CONTROL POTEN
-
TIOMETER, replace Logic PCB 3.
2. Defective Main PCB 1.
a) Replace Main PCB 1.
D. In LATCH mode, when the START signal is
released the arc shuts OFF immediately.
1. Defective Logic PCB 3
a) Replace Logic PCB 3
E. With CURRENT CONTROL POTENTIOMETER
set at maximum, output current is only 60
amps.
1. Tip is touching the work piece, Drag mode.
a) Lift tip off work piece
2. Defective Pilot IGBT on Main PCB 1
a) Check per section 4.10-I
3. Open Sync cable between J14 on Main PCB 1 and
40Amp PCB 5.
a) Check continuity and replace if open.
4. Open connection between J13 on Main PCB 1 to J4 on
40A PCB 5.
a) Check continuity.
5. Defective 40Amp PCB 5.
a) Replace 40Amp PCB 5
F. With CURRENT CONTROL POTENTIOMETER
set at maximum, output current is only 70
amps.
1. Open Sync cable between J14 on Main PCB 1 and
50Amp PCB 5.
a) Check continuity and replace if open.
2. Open connection between J13 on Main PCB 1 to J4 on
50A PCB 5.
a) Check continuity.
3. Defective 50Amp PCB 5.
a) Replace 50Amp PCB 5
Summary of Contents for CUTMASTER 102
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Page 91: ...CUTMASTER 102 Manual 0 4998 PARTS LIST 6 9 A 07994_AB 1 4 2 3 5 6 7 8 9 10 12 11 10 13 ...
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