20.0
15.0
10.0
5.0
0.0V
-5.0
-10.0
-15.0
-20.0
-100.0 us
5 us/Div.
Input A
130BX146.10
Illustration 8.16 Gate Signal Waveform from Gate Drive Card
IGBT gate signal measured on the gate drive card: 5 V per
division vertical scale, 50 ms per division time scale. Unit
running at 30 Hz.
An incorrect reading of a gate signal indicates that the
gate drive card is defective or the signal has been lost
before arriving at the gate card. The gate signals can then
be checked with the signal test board to verify their
presence from the control card to the power card as
follows.
1.
Insert the signal test board into power card
connector MK104.
2.
With scope probe common connected to terminal
4 (common) of the signal board, measure 6 gate
signals at signal board terminals 25–30.
3.
Place the drive in run mode at 30 Hz.
The waveform in
is the correct result.
8.00
6.00
4.00
2.00
0.00V
-2.00
-4.00
-6.00
-8.00
-100.0us
Input A
130BX147.10
5 us/Div.
Illustration 8.17 Gate Signal Waveform from Signal Test Board
Test Procedures
Service Guide
MG94A502
Danfoss A/S © 02/2019 All rights reserved.
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