TM 5-6115-376-13
contactor S3 must be actuated to complete a cur-
assembly through power input receptacle, voltage
rent through power output receptacle or load
is applied through synchronizing bypass switch
cable interconnecting switchbox receptacle to the
S2, across terminals 6 and 7 of terminal load
load. This is accomplished by the following:
TB1, across resistor R2, through transformer Tl,
(a) When power is applied to load through
rectifiers CR1 through CR4, and resistor capacitor
(RC) network consisting of resistor R3 and ca-
power input and power output receptacle from
pacitor Cl, and is applied to the solenoid of
a single power source, synchronizing switch S1
is closed to apply power to one side of the solenoid
control relay K2, as shown in figure 2-8. When
of magnetic contactor S3 and auxiliary relay K1.
power is applied to the synchronizer assembly
The solenoid current is completed through con-
through load cable interconnecting switchbox
tacts 3 and 4 of de-energized control relay K2.
(the synchronizer assembly) receptacle, 3-phase
power is applied through safety circuit breaker
Control relay K2 is deenergized by activating syn-
chronizing by-pass switch S2. When auxiliary
CB1 and power output receptacle to load cable.
relay K1 is energized, one pair of contacts com-
A voltage is also applied across terminals 1 and
pletes the governor current (c below) of the diesel
2 of terminal board TB1, across resistor R1
engine generator sets and the other set of contacts
through transformer Tl, rectifiers CR1 through
short contacts 3 and 4 of control relay K2. When
CR4, and RC network R3 and Cl, to solenoid of
synchronizing by-pass switch S2 is released, con-
control relay K2 and safety circuit breaker. Light
DS1 glows to indicate presence of power at load
tacts of auxiliary relay K1 hold auxiliary relay
K1 and magnetic contactor S3 energized.
cable interconnecting switch box receptacle (or
(b) When power is applied to load through
synchronizer assembly).
(3) Magnetic contractors S3. When power is
p o w e r input, the load cable interconnecting
switchbox, and power output receptacles from two
applied to the synchronizer assembly through
power sources, the electronic synchronizer assem-
power input receptacle ((2) above), magnetic
