Thermal Dynamics 51 CUTMASTER, Руководство по обслуживанию

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Manual 0-2972 4-19 TROUBLESHOOTING
3. IGBT Circuit Test
a. Use an ohmmeter set to the diode function and make
the following measurements on the IGBT Board to
the Main Power Board.
Meter (+) Meter (-) Meter (+) Meter (-) Indication
E3 E13 E35 E13 Diode Drop
E13 E3 E13 E35 Open
E15 E3 E15 E35 Diode Drop
E3 E15 E35 E15 Open
E15 E13 E15 E13 (2) Diode Drops
E13 E15 E13 E15 Open
208/230V
Power Supply
400V & 460V
Power Supply
CM51 IGBT Test Indications
b. The meter should indicate a diode drop in one di-
rection and an open in the other direction for each
check. Replace IGBT Board if readings are not the
same as the chart.
c. Activate the torch.
• After two seconds INV ON indicator on the
Logic PCB should turn ON. If indicator does
not turn ON, replace Logic PCB.
d. Measure open circuit voltage between E7(+) to E10
(-) on the Main Power PC Board. Voltage should be
greater than 200 vdc. If voltage is less than 10 vdc,
refer to the output diode test measurements or IGBT
module test measurements or shorted torch mea-
surements.
4. Gate Drive & DC Sensing
a. After checking all previous steps in Subsection
4.09-G, jumper TP1 to TP
2
on the Logic PCB.
b. Disconnect wires from the Main PC Board as shown
in the chart. When the unit is turned on, the DC
light should remain ON.
208/230V Units E3, E13, E15
400, 460V Units E13, E15, E35
Main PC Board Wire Disconnection Points
c. Activate the torch (press torch switch on the handle,
send START signal from CNC Control or press the
torch switch on the Remote Pendant). After two sec-
onds INV ON indicator on the Logic PCB should
come on and remain on.
• If INV ON indicator does not remain on, replace
Logic PCB.
• If INV ON indicator does remain on, then check
for approximately 6 vdc between J1-29 and J1-
28 and between J1-27 and J1-26.
• If no voltage, replace Logic PC Board.
• If voltage is correct, measure for approxi-
mately 6 vdc between E32 to TP-14 on the
IGBT PCB and E31 to TP13 on IGBT PC
Board.
• If 0 vdc, replace Main PC Board.
• If correct, reconnect wires to Main PC
Board.
d. With jumper between TP1 to TP
2
still in place, acti-
vate the torch and measure for 230 vdc to 300 vdc at
Main PCB E18 to E19. Refer to Appendix 4-A or 4-B.
• If 0 vdc, replace IGBT PC Board.
• If correct, replace Logic PC Board.
This completes the test procedures.