Signal Test Board Pin Outs - Danfoss VLT FC Series Service Manual

Special Test Equipment

9.3.2 Signal Test Board Pin Outs

Table 9.2 lists the pins found on the signal test board. For each pin, its function, description, and voltage levels are provided.
Details on performing tests using the test fixture are provided in chapter 8 Test Procedures of this guide. Other than power
supply measurements, most of the signals being measured are made up of waveforms.
Sometimes, a digital voltmeter can be used to verify the presence of such signals. However, do not rely on the voltmeter to
verify that the waveform is correct. An oscilloscope is the preferred instrument. When similar signals are being measured at
multiple points, a digital voltmeter can be used with some accuracy. By comparing signals to one another, such as gate
drive signals, and obtaining similar readings, it can be concluded that the waveforms match and are correct. Values are
provided for using a digital voltmeter for testing as well.
Pin Schematic
No. acronym
1 IU1
9 9
2 IV1
3 IW1
4 COMMON
5
6
7 INRUSH
8
9
10
126
®
VLT FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
Function Description
Current sensed,
2000.0
U phase, not
1500.0
conditioned
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
Approximately 400 mV RMS at 100% load.
Current sensed,
2000.0
V phase, not
1500.0
conditioned
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
Approximately 400 mV RMS at 100% load.
Current sensed,
2000.0
W phase, not
1500.0
conditioned
1000.0
500.0
0.0 mV
-500.0
-1000.0
-1500.0
-2000.0
-200 ms
Approximately 400 mV RMS at 100% load.
Logic common This common is for all signals.
Not used
Not used
Control card Signal from the control card to start gating the SCR front end. Signal
signal not relevant in E1h–E4h drives.
Not used
Not used
Not used
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Input A
1 ms/Div
Input A
1 ms/Div
Input A
1 ms/Div
Reading using a
digital voltmeter
0.937 V AC at
peak
165% of CT current
rating. AC waveform
at output frequency
of the filter.
0.937 V AC at
peak
165% of CT current
rating. AC waveform
at output frequency
of the filter.
0.937 VAC at 165%
peak
of CT current rating.
AC waveform at
output frequency of
the filter.
3.3 V DC – Inrush
mode
0 V DC – Run mode
MG94A502