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Test Procedures
3
2
2
1
Illustration 6.11 Soft Charge Card Connectors
380-480/500 V: Blue MOV and 8 PTCs. 525-690V: Red MOV
and 6 PTCs
1
MK1
2
MK3
3
MK4
4
MK2
6.5 After Repair Drive Test
6.5.1 Procedure
Following any repair to a frequency converter or testing of
a frequency converter suspected of being faulty, the
following procedure must be followed to ensure that all
circuitry in the frequency converter is functioning properly
before putting the unit into operation.
1.
Perform visual inspection procedures as described
in the table Visual Inspection.
2.
Perform static test on the drive as described in
Static Test Procedures.
3.
Remove the three output motor bus bars from
each inverter module.
4.
Connect a 610 – 800 VDC power supply to the
switch mode power supply (SMPS) input to each
module using the test cable 176F8766.
5.
Apply power to the SMPS and observe that the
display lights up properly. (The fans will not
operate when powered in this manner.)
6.
Give the frequency converter a run command
(press [Hand on]) and slowly increase the
reference (speed command) to approximately 40
Hz.
High Power Service Manual for Modular F Frame Drives
4
®
MG90K202 - VLT
is a registered Danfoss trademark
7.
Using the Signal Test Board 176F8437 and an
oscilloscope, check the waveform at pins 25 - 30
with the scope referenced to pin 4. This
procedure must be performed on each inverter
module. Each waveform should approximate the
illustration below.
8.
Connect a 24 VDC power supply to the DC bus of
the drive. This can be done on the DC bus output
of the rectifier module or the bus bars
connecting to the top side of the DC fuses on
any of the inverter modules.
9.
Observe the phase to phase waveform on the
output bus bars of each phase of each inverter
module. This waveform should appear the same
as the normal output waveform of a properly
operating drive, except that the amplitude will be
24 V instead of the full output voltage of a
normal drive.
10.
Press the OFF key of the frequency converter,
disconnect power from both power supplies, and
reinstall jumper connectors to the SMPS input
plugs on all modules.
11.
Reinstall the motor output bus bars on all
inverter modules.
12.
Apply AC power to the drive.
13.
Apply a start command to the drive. Adjust the
speed to a nominal level. Observe that the motor
is running properly
14.
Using a clamp-on style current meter, measure
the output current on each phase. All currents
should be balanced.
Input A
8.00
6.00
4.00
2.00
0.00 V
-2.00
-4.00
-6.00
-8.00
-4.0ms
50Us/Div
Illustration 6.12 After repair waveform: 2v/div 100us/div run at
10 Hz
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