TM11-6125-256-34
output voltage can be varied between the limits of 110
c Check that the following regulator input voltage are
and 120 volts the voltage regulation circuits are
present at the regulator connection board
probably operational, If the output voltage range is
obtained, adjust the output to 116 volts and perform step
(1) 16.3 volts dc between terminal 7 and ground
(3) If the range is not obtained, make troubleshooting
(2) At least 27 4 volts dc across the armature,
voltage measurements as described in paragraph 4-8.
measured at terminal 4 to ground
(3) Rotate the frequency adjustment potentiometer
(3) 115 to 117 volts ac from terminal 1 to ground
fully counterclockwise and then fully clockwise while
observing the phase A to neutral output frequency and
(residual magnetic buildup voltage)
voltage If the output frequency can be varied between
the limits of 390 and 410 Hz while the ac output remains
d To ensure that an operational voltage and
approximately 116 volts, the frequency regulation
frequency regulator assembly has not been returned for
circuits are probably operational However, to prevent
General Support Maintenance make the following
an assembly with an intermittent problem from being
check
returned to service, subject the known good
motor-generator with the questionable regulator
(1) Reduce the dc input to 27 5 volts
assembly to general support commutation and spin tests
If these tests are satisfactorily performed, the assembly
may he returned to service If incorrect results are
(2) While observing the phase A to neutral output
obtained, make troubleshooting voltage measurements
voltage rotate the voltage adjust potentiometer (fig 3-1)
as described in paragraph 4-8
fully counterclockwise and then fully clockwise If the
4-5
