Surge Testing
12/3/2009 | 71-022 V6
D30R
46
The test should conclude once a predetermined test voltage is reached. Consult IEEE 522,
NEMA MG-1 for recommended test voltages. A good rule of thumb is to test a coils at
2*V+1000 where V is the operating voltage of the motor. Examples: a 480 volt motor would
be tested at 2*480+1000=1960V, a 4160 volt motor would be tested at
2*4160+1000=9320V.
Three phase motor check list
1)
Check to ensure there is nothing connected to the coil or winding being tested. This is
extremely important when testing installed coils or windings. Test inaccuracies will
result and the situation can be hazardous to personnel performing tests.
2)
Plug the unit in and insure that there is a good ground connection. The unit will
illuminate the Open Ground detect light and inhibit testing if a positive ground is not
sensed.
3)
Move Test Lead Switch to Ground.
4)
Connect the three-phase motor as shown.
5)
Calculate final test voltage.
6)
Rotate the Function Knob to Surge.
7)
Rotate the test selector knob to Lead 1.
8)
Press and hold the Test button. The instrument is now generating surge pulses and the
waveform is shown on the display. The trace for the waveform may be moved up and
down and left and right using the Horizontal and Vertical position controls on the front
panel. The display will show the measured maximum voltage across the terminals of the
motor, number of applied pulses, and the % output of the tester along with the
waveform.
9)
Press the Output Control buttons to increase the applied surge voltage.
10)
Adjust the Volts/div scale and the Time/div scale to fit the surge waveform on the
screen. The Volts/div scale may have to be changed as the test proceeds to higher test
voltages.
11)
Watch the surge waveform display while the voltage is increasing looking for flickering
display, a drop in amplitude or a jump of the waveform to the left of the display.
12)
Once the test voltage is reached, stop pressing the output control button and release the
Test button.
13)
Store the results for Lead 1 in one of the 10 test records with the following procedure:
14)
Press the store Function Key above the top of the screen.
15)
Select the record to store the data in by pressing the Up / Down Function Keys to
highlight the desired record and pressing Select.
16)
Highlight Lead 1 on the next screen.
17)
Again press select to load the data into the tester’s memory.
Summary of Contents for D30R
Page 6: ...Table of Contents 12 3 2009 71 022 V6 D30R 6...
Page 12: ...Safety precautions CE compliance 12 3 2009 71 022 V6 D30R 12...
Page 24: ...Coil Resistance Testing 12 3 2009 71 022 V6 D30R 24...
Page 28: ...Principles of High Voltage DC Testing 12 3 2009 71 022 V6 D30R 28...
Page 38: ...High Voltage DC Testing 12 3 2009 71 022 V6 D30R 38...
Page 50: ...Surge Testing 12 3 2009 71 022 V6 D30R 50...
Page 70: ...Data Recording Retrieving 12 3 2009 71 022 V6 D30R 70...