Danfoss VLT AHF 005 Service Guide

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 Illustration 8.17 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. 113
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Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English