Refer to the three pins as 1, 2, and 3, reading bottom to top. Pins 1 and 2 of each connector are in parallel with the gate
drive signal sent to the IGBTs. Pin 1 is the signal and pin 2 is common.
1.
Turn on the split bus power supply (only 650 V).
2.
In stop mode, measure pins 1 and 2 of each test connector. A correct reading reading is approximately -9 V DC
which indicates that all IGBTs have been turned off.
3.
Apply the run command to the adjustable frequency drive and 30 Hz reference.
4.
If using a voltmeter, measure pins 1 and 2 of each connector. Waveform to IGBTs is a square wave that goes
positive to 14 V DC and negative to -9 V DC. Average voltage read by the voltmeter is 2.2 to 2.5 V DC.
130BX503.10
14
13
12
11
10
9
8
7
6
5
4
1
2
3
Figure 6.9 Gate Drive Card
1
MK102: Connection to inrush board
8
MK600: V phase upper IGBT test point
2
MK101: Gate drive and inrush control signals to the power
card
9
MK601: V phase IGBT gate signal
3
MK700: W phase upper IGBT test point
10
MIK602: V phase lower IGBT test point
4
MK701: W phase IGBT signal
11
MK100: IGBT temperature feedback
5
MK702: W phase lower IGBT test point
12
MK500: U phase upper IGBT test point
6
MK200: Brake IGBT test point (optional)
13
MK501: U phase IGBT gate signal
7
MK201: Brake IGBT gate signal (optional)
14
MK502: U phase lower IGBT test point
Table 6.5 Legend to
Test Procedures
Service Manual
84
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
MG94A222
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Summary of Contents for VLT FC 103
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