TM 5-6115-376-13
bly (fig. 2-9), compares voltage, phase and fre-
both power sources.
quency of the two power sources and applies
d. Switch box (PU-699/M only). This is a
resultant dc voltage to solenoid of control relay
military design used on the trailer mounted 60KW
K2. When input power sources are equal in volt-
generator set. Unit selection as primary, standby
age, frequency, and phase and synchronizing
or parallel operation entirely automatic. Contains
switch S1 is in on position, auxiliary relay K1 and
switches for applying power to Gen No. 1, Load
magnetic contactor S3 are energized, and power
1, Load 2 and Gen No. 2. Applies power from
is applied to load from both power sources.
generator (s) to distribution box (es) for distribu-
tion to the portable distribution boxes to supply
(c) When two power sources are paralled
((b) above), auxiliary relay K1 connects the
single-phase 60 hertz, 115 volt AC current to com-
electric governor circuit series. This arrangement
ponents of an area-type communication system
maintains required equal voltage output from
