8 Special Test Equipment
8.1 Test Equipment
Test tools have been developed to aid in troubleshooting
these products. These tools are required to perform some
of the procedures outlined in this manual. Test equipment
described in this section is available from Danfoss. See
for part numbers.
8.1.1 Split Bus Power Supply
In Split Bus Mode, the DC bus is split into two parts. One
connects to the power card to power up the SMPS on the
power card. By powering only the SMPS, the various logic
circuits can be tested without the danger of damaging the
power components.
The other connection can be used to provide low voltage
power to the DC capacitors and the output IGBTs for test
purposes. A low voltage power supply connected to the
DC bus allows testing the functionality of the output
section safely.
Connecting the adjustable frequency drive in split bus
mode:
1.
Ensure that AC power has been removed and all
DC capacitors are fully discharged. Wait 20
minutes to ensure full discharge time.
2.
Unplug the cable to connector MK902 on the
power card.
3.
Connect the power card supply cable from the
split bus power supply to connector MK902 on
the power card.
4.
Connect the DC bus supply cable from the split
bus power supply to the cable that was
unplugged from MK902.
NOTICE!
Do not apply AC line voltage to the adjustable frequency
drive when it is wired in split bus mode.
The power card supply should provide between 610 and
750 V DC of power. The Danfoss split bus power supply
provides 650 V DC with a capacity of 250 mA.
The DC bus supply should provide a low level DC voltage.
The Danfoss split bus power supply provides 24 V DC with
a capacity of 2 amps.
8.1.2 Signal Test Board (p/n 176F8437)
The signal test board provides access to a variety of signals
that can be helpful in troubleshooting the unit.
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 unit will need the DC bus enabled and
operating a load to verify some test signals.
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 8.1 Signal Test Board
Special Test Equipment
Service Manual
120
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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