TECHNICAL DOCUMENTATION
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www.inpower-sys.com
1IPSE1A33-60
Double pulse switching test
Run a double pulse test on the channel under test. Use half the nominal DC-bus voltage at fi rst. Once that
is okay, repeat the test with the nominal DC-bus voltage.
Make sure to capture the input and output signals on the oscilloscope and save the images. If something
does not seem right, stop the test straight away and check for the reason!
Once these tests have been successful, turn off the DC-bus supply and wait until the DC-bus has COMPLETELY
DISCHARGED. Then turn off the low voltage supply to the driver.
Normal switching test
Connect the application controller to the input of the driver. Make sure all the connections are correct, no
wires inter-changed, all the bolts are still tight and no conductive materials or swarf is interfering with the
required clearance and creepage distances
Now the full switching test can be conducted.
Proceed by turning on the low voltage supply to the driver and then slowly turning up the DC-bus voltage
as with the pre-test. If something does not seem right, stop the test straight away and check for the reason!
If there has been an incorrect connection, make sure the driver is not damaged!
Once the nominal DC-bus voltage is present, turn on the controller, thereby applying the application
switching signals. Make sure to capture the input and output signals on the oscilloscope and save the
images.
If all is well, you have got the system working correctly. If something does not seem right, stop the test
straight away and check for the reason!
The voltage and current waveforms may not precisely look like the expected result. This will be due to
specifi cs of the inverter design such as stray or leakage inductances and bus-bar or cable runs.
Short circuit test
If the results you have achieved so far are of suffi
cient quality, you can proceed with the short circuit
tests.
This is carried out just like the double pulse test described above, except with a short circuit applied at the
appropriate terminals.
Again start with half the nominal DC-bus voltage. Due to the fact that much higher currents can be
expected with this test, take extreme caution in protecting all personnel and equipment from inadvertent
action or explosion!
Finally use the full nominal DC-bus voltage and repeat the test, capturing the signals on the oscilloscope.
Re-programming of the IPS driver
To get the driver tuned to the optimum result, it may require the IPS application support. Please forward
the scope images to IPS together with any relevant information on the application test.
The engineering team of the InPower Systems will evaluate your tests results and send you a re-programming
software tuned exactly to the real conditions of your inverter.
NOTE: We can only retune the driver according to your real conditions if we receive from you all relevant
information of your inverter including tests results.
