ULTRAFEED VAF-4
5-10 TROUBLESHOOTING Manual 0-5332
5.07 Preliminary Check of the Motor Control PCB1 (Main Power OFF)
!
WARNING
Check DC bus voltage has discharged to less than 5VDC before servicing. Ensure the interconnection
lead is disconnected from the receptacle.
Art # A-12017_AB
TP1
TP2
TP3
Figure 5-2 Preliminary Check of the Motor Control PCB1
DC Bus Testing
Multimeter Lead Placement
Voltage with
Supply voltage
OFF
Main capacitor bank
Positive meter lead to TP 1
Negative meter lead to TP 2
<5 VDC
Table 5-4 DC BUS, Multimeter set to measure DC volts
Motor Mosfet Testing
Multimeter Lead Placement
Ohms
Motor Drive Mosfet
Positive meter lead to TP 1
Negative meter lead to TP 3
> 1k
W
Brake Mosfet
Positive meter lead to TP 3
Negative meter lead to TP 2
> 1k
W
Table 5-5 Motor Drive Mosfet, Multimeter set to measure ohms (
W
)
