Veichi AC310 Service Manual page 11

Black pen
AC file
Single measurement
measurement
When the drive voltage is at a positive value, the drive is turned on, and at a negative
measurement
measurement
value, the drive is turned off, so use the AC gear to measure it.
measurement
Measurement of normal voltage points during operation:
◼
Red pen
Black pen
DC grade
The UTP, VTP, and WTP voltages are generated by the VDR, if there is a problem there,
the drive voltage generated by the switching power supply is faulty Problems.
Measure the voltage of the drive signal on the control board when it is not in operation
(DC phase).
UH UL
5V 5V
Waveforms of one of the drive signals and GND outputs during operation: as follows
(if the output waveforms are abnormal, the control board is abnormal)
Measure the voltage of each drive signal and GND is about 11.5v when running with
ACgear.
◼ Use two ripple probes (pay attention to isolation) to connect to the upper and lower arm
drivers of the same phase (directly soldered to the IGBT pins), power up and run the
whole machine, and test the driving waveforms. (If there is no waveform, the module
may be damaged, or the UH, UL, VH, VL, WH, WL provided on the control board may
be defective.).
U V0 W0
0
8 8-9V 8-9V
-
8 8.03V 8.01V
9
.
V
0
2
V
UTP
U0
16V
VH VL
5V 5V
AC310 Universal AC Drive Service Manual
N N
8-9V 8-9V
8.20V 8.20V
VTP
V0
16V
WH
GND
5V
N
8-9V
8.20V
VTP
W0
16V
WL
5V
10