Victor CUTMASTER 102 - Page 63

CUTMASTER 102
Manual 0-4998 SERVICE
5-17
Fan MOT 1 turns ON without START signal being
activated. (Rev AB & earlier)
1. Open connection between J2 on Capacitor PCB to J3
on 40A PCB.
2. Defective Main PCB
a) Measureforapproximately325VDCbetweenMTH
1toMTH7
3. Capacitor 12VDC bias supply voltage missing
a) DisconnectplugfromJ2onCapacitorPCBand
measure for 12VDC between J2-1 to J2-2. If not
correct replace Capacitor PCB
4. Defective 40A PCB
See 40A PCB exclusion
Fans MOT 2 and MOT 3 do not turn ON when
START signal is activated
1. Shorted fans MOT 2 or MOT 3
2. Bad connection on wires from J2 on Capacitor PCB to
J3 on 40A PCB.
3. No+12VDCBiasSupplyvoltagefromCapacitorPCB
from J2.
4. Loose/unplugged connections on J12 on Main PCB /
J1 on Capacitor PCB
Air flow does not momentarily turn OFF then back
ON after the START signal is active.
1. Defective start cartridge
2. Torch O-ring has moved into wrong groove.
Internal visual checks:
1. Loose/unplugged connections on J12 on Main PCB
and J1 on Capacitor PCB.
2. Loose/unplugged connections on J2 on Main PCB and
J1 on Logic PCB.
3. Loose/unplugged connections on J2 on Capacitor PCB
and J3 on 40A PCB.
4. Sync cable unplugged from Main PCB or 40A PCB.
5. Loose/unplugged connection on J5 on Main PCB.
40A PCB exclusion
DisconnectJ4&J9connectorsandremovewirefromCHOKE1
terminal.
Measure Capacitor PCB bias supply between J21 to J2-2 for
12VDC. If 40A PCB is at fault, the unit will function but with
reduced output current.
Perform Pre power-up checks
1. W1
2. OpenInputDiode–InputrectierD1onMainPCBor
40A PCB
3. Shorted/Open IGBT s
4. Output Diodes on both Main PCB and 40A PCB.
5. Torch / parts
Power checks:
1. Low input voltage or missing phase
a) Measurevoltageunderload
2. Defective W1 contactor.
a) MeasureoutputofW1underload
3. Shorted Sync cable
4. Open connection between J2 on Capacitor PCB to J3
on 40A PCB.
5. DefectiveLogicPCB(withRibboncable)
a) Openconnectioninribboncable
b) MeasureLogicPCBforrelaycongurationsignals
J1-4toJ1-25(Lowfor460V=<1VDC)
J1-5toJ1-25(Lowfor230V=<1VDC)
With START signal active
1. MeasureLogicPCBCUR_SETsignalbetweenJ1-6to
J1-25. If missing replace Logic PCB
2. MeasureLogicPCBforSHUTDNsignalbetweenJ2-10
to J2-25 to go low while continuing to activate the start
signal.
If voltage does not go low, replace Logic PCB.
3. Defective Main PCB
a) Measurefor approximately325VDCona230V
system, 650VDC on a 460V system and 850VDC
ona600VsystembetweenMTH1toMTH7under
load. Readings a lot lower than these will indicate
a defective PCB.
4. Capacitor 12VDC bias supply voltage missing
a) DisconnectplugfromJ2onCapacitorPCBand
measure for 12VDC between J2-1 to J2-2.
If not correct, replace Capacitor PCB
5. Defective 40A PCB
See 40A PCB exclusion
6. Defective Main PCB