OM-2245 / Operation and Maintenance Manual
ITW GSE 4400 / 400 Hz. Generator Set
March 15, 2015
Chapter 2-3
Page 6
5) Diode Test
Test values for diodes are not given here because they could be misleading. Test values may vary even
between diodes of the same part number, rating, and manufacturer. General instructions for testing
diodes are as follows:
a) Disconnect exciter windings from diode lead(s).
NOTE:
Use a good quality ohmmeter or multimeter. Verify that the instrument is set on its lowest scale.
Make certain the battery is in good condition and for analog meters that the pointer is adjusted to zero
when the test leads are shorted together.
b) Hold one ohmmeter lead point on the threaded end of the diode. Hold the other lead point on the
wire terminal end. Observe and note the indicated resistance. Now reverse the lead connection on
the diode. Again observe and note the ohmmeter indicated resistance. Generally speaking, if an
infinite or very high resistance was indicated with the leads connected one way and a low, readable
resistance was indicated with the leads connected the opposite way, the diode may be considered
good.
6) Testing the Active Rectifier Unit (ARU) (for units with the DC option)
The 28.5 VDC ARU is an optional add-on to the GPU. The following test procedures may be used for
testing the ARU following repair, or for just checking performance.
a) Preparation for Testing
(1) Connect the ARU to a DC load bank.
(2) Start the GPU per the operating procedures in Chapter 1, Section 3.
b) Operational
Test
Procedure
(1) Power Delivery
a Press
“
28 VDC
”
pushbutton to close the DC output contactor. The green
“
DC OUTPUT
” LED
will glow indicating that DC power is being delivered to the load bank.
b
Using a calibrated multimeter, measure the DC voltage at the load bank with no load. The
voltage should be 28.5 VDC.
c
Place a 600 amp load on the GPU. The measured DC voltage at the load bank should still
be 28.5 VDC. Observe the DC voltage and amps on the output screen of the display for
accuracy.
d
If the full load voltage reading is more than 0.5 VDC from the desired output voltage (typically
28.5 VDC) then adjust the line drop compensation using the “28V Compensation” screen in
the Setup menu. (See Chapter 1-3 Paragraph 4.18)
(2) Discontinue Power Delivery
Press “
28 VDC
”
pushbutton to open the DC output contactor. The green LED will turn off,
indicating that DC power has been removed from the load bank.
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