Figure 2.-8. Synchronizer assembly controls indicators and instruments.

TM 5-6115-376-13

Figure 2.-8. Synchronizer assembly controls indicators and instruments.

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

((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