9 Special Test Equipment
9.1 Test Equipment
Test tools have been developed to aid in troubleshooting
these products. It is highly recommended for repair and
servicing this equipment that these tools be available to
the technician. Without them, some troubleshooting
procedures described in this manual cannot be carried out.
Although some test points can be found inside the filter to
probe for similar signals, the test tools provide a safe and
sure location for making necessary measurements. Test
equipment described in this section is available from
Danfoss.
CAUTION
Using the test cable allows powering the filter without
having to charge DC bus capacitors. Main input power is
required and all devices and power supplies connected to
line power are energized at rated voltage. Use extreme
caution when conducting tests on a powered filter.
Contact with powered components could result in
electrical shock and personal injury.
9.1.1 Signal Test Board (p/n 176F8437)
The signal test board provides access to a variety of signals
that can be helpful in troubleshooting the filter.
The signal test board is plugged into power card
connector MK104. Points on the signal test board can be
monitored with or without the DC bus disabled. In some
cases, the filter 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.
of this manual
describes when these tests would be called for and what
the signal should be at that given test point.
130BX
66.10
Figure 9.1 Signal Test Board
9.1.2 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
of this manual. 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 prefered instrument. 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.
Special Test Equipment
VLT Advanced Active Filter AAF006 D and E Frames Service Manual
MG90Z122 - VLT
®
is a registered Danfoss trademark
9-1
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