TM-268 819 Page 17
Belt Driven Generator
8-4.
Power Board PC1 Testing Information
803 236 / Ref. 209 400
Be sure plugs are secure before
testing. See Section 8-5 for specific
values during testing.
1
Power Board PC1
2
Receptacle RC31
.
Receptacle RC31 was pre-
viously labeled RC14.
Test Equipment Needed:
2
1
8-5.
Power Board PC1 Test Point Values
PC1 Voltage Readings
a) Tolerance −
±
10% unless specified
b) Condition − no load; generator run-
ning at 3000 (50 Hz) or 3600 rpm (60
Hz)
c) Reference − to circuit common
(RC31-7) unless noted
Receptacle
Pin
Value
RC31
1
Pulse Width Modulation (PWM) Signal: +1.5 volts at no load; voltage increases with generator load to
approximately 4.3 volts DC at maximum.
2
Shutdown Signal: 0 volts DC during normal operation. If 12 volts DC is present, check rotor and if
rotor checks ok, replace control board PC1.
3
+12 volts DC
4
Revolving field (rotor): +25 volts DC at no load with respect to RC31-6; +75 volts DC at full load with
respect to RC31-6
5
Not used
6
Revolving field (rotor): +25 volts DC at no load with respect to RC31-4; +75 volts DC at full load with
respect to RC31-4
7
Circuit common
8
Exciter: 150 volts AC with respect to RC31-9
9
Exciter: 150 volts AC with respect to RC31-8
