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capability. Due to the bootstrap topology does not have a negative voltage, the need to
shorten the shutdown time to ensure that the dead zone, drive to increase a shutdown loop,
shutdown
After the diode is on, the driver resistor is connected in parallel.
Diodes such as D40 are used to reverse clamp the output of the optocoupler, preventing
the optocoupler pin 5 to pin 4 ground from generating too large a negative voltage when the
IGBT is turned on, resulting in optocoupler output abnormalities.
The value of the gate capacitance is related to the small voltage spike caused by the
continuity of current to the tube after the IGBT is turned off, and a too small value of this
voltage spike may lead to false turn-on.
2. Fault type
No output, output out of phase, module damage, SC
3. Inspection Method:
Static detection:
W314 On-circuit detection
1
3
+
-
Detection of IGBT gate resistance (2.2kw machine)
UG+
VG+
U0
V0
5.2K
5.2K
Problems with the drive resistor may be due to a damaged drive resistor, or a damaged
module.
Dynamic detection:
◼
Voltage between VDR and N when not running: 16.5±1V (DC)
Note: R151 is a 0Ω resistor on the P-line. Failure of this resistor will result in no power to
the bus voltage disconnect and thus no power to the switching power supply.
◼
Measurement of relevant drive voltage points during operation:
Red pen
4
5
6
+
-
+
-
+
-
WG+
UG-
W0
N
5.2K
10K
U
VG+
WG+
G
+
AC310 Universal AC Drive Service Manual
Multimeter Diode
1.22
0.23
0.64
0.76
VG-
WG-
N
N
10K
10K
UG-
VG-
GBRK
N
10K
WG-
9
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