Signal Test Board (P/N 6Kaf6H8437); Signal Test Board Pin Outs: Description And Voltage Levels - GE AF-650 GP Operating Instructions Manual

High Power Service Manual for Unit Sizes 6x

10.1.2 Signal Test Board (p/n 6KAF6H8437)

The signal test board provides access to a variety of signals that can be helpful
in troubleshooting the frequency converter.
The signal test board is plugged into the 30 pin panel connector on the top
of each inverter module. Points on the signal test board can be monitored
with or without the DC bus disabled. In some cases, the frequency converter
will need the DC bus enabled and operating a load to verify some test signals.
The following is a description of the signals available on the signal test board.
The section Test Procedures describes when these tests would be called for
and what the signal should be at that given test point.
Illustration 10.1: Signal Test Board

10.1.3 Signal Test Board Pin Outs: Description and Voltage Levels

The tables on the following pages list the pins located 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 the section Test Procedures. Other than power supply measurements, most of the signals being measured
are made up of waveforms.
Although in some cases, a digital voltmeter can be used to verify the presence of such signals, it cannot be relied upon to verify that the waveform is correct. An
oscilloscope is the instrument prefered. However, when similar signals are being measured at multiple points, a digital voltmeter can be used with some degree
of confidence. By comparing several signals to each other, such as gate drive signals, and obtaining similar readings, it can be concluded each of the waveforms
match one another and are therefore correct. Values are provided for using a digital voltmeter for testing as well.
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