Installation, Operation and Service Manual
RCEM
© 2012 DynAmp, LLC
Page 29
43756 G
7.6
VERIFYING PROPER INTEGRATOR RESET SYNCHRONIZATION
One possible source of incorrect device data is improper integrator reset synchronization.
Check any suspect channels with an oscilloscope. The waveform should look similar to
Figure 7.1
Figure 7.1
Device Current Waveform
The device current waveforms should be present anytime the rectifier is ON. Proper
integrator reset synchronization is indicated by 0 volts when rectifier device is
not
conducting during the commutation cycle. That is, the device current "humps" should rise
from, and return to a level of zero volts (no dc offset voltage present).
If a dc offset voltage is present in the device current waveform, the integrators are not
being reset at the proper time. In this case, check the suspect integrator card as follows:
1.
Make sure that all integrator cards are properly seated in the card rack.
2.
Connect the oscilloscope to the questionable waveform test points. See Figure 7.2.
3.
With the laptop computer connected to the Personal Daq/56, click on the “RCEM
RESET” button on the spreadsheet.
4.
If the problem persists, remove the integrator card, and substitute a known good
integrator card. Be sure to observe static precautions.
5.
Repeat steps 3 through 4.
7.7
ADJUSTING THE SIGNAL GENERATOR
To adjust the signal generator, refer to Figure 7.2 and proceed as follows:
a.
Connect a DMM between TP1 (+) and TP2 (COM). Place switch
SW2 Position 2
in
the
MANUAL
position (switch lever down).
b.
Place switch
SW2 Position 1
in the
V-
position (switch lever down).
c.
Adjust potentiometer
R54
for a reading of -10.000 Vdc.
d.
Place switch
SW2 Position 1
in the
V+
position (switch lever up).
