TM 9-6115-699-13&P
1.14.4 Signaling Circuits, operational Function.
The Generator Sets 150 kW and PDU of the EPP III deliver the following signals to the ECS
(figure 1-11):
Low Fuel
Indicates low fuel through diodes A1/V12 and A1/V14
Faults
Diodes A1/V13 and A1/V15 signal generator faults. This signal is a
combined signal of the following functions:
Battery charging control
oil pressure
Oil temp-cylinder head
Air filter
Under/over frequency
Under/over voltage
Generator over temperature
Overload
Reverse power
Generator 1 On line
Generator 2 On line
In addition, cutout of any power contactor K3 to K6 in the PDU due to
overload is signaled by relay contacts 13/14 of K16 to K19.
Generator 1 is delivering power to the system.
Generator 2 is delivering power to the system.
BATTLE SHORT Function
This function is implemented in the ECS, in certain phases of the RS/ECS radar system, on the
basis of EPP III signals, and prevents a generator from shutting down during that phase due to the
faults listed below. In other words, power delivery from the generator must be especially reliable at
that time. The function takes effect when relay K8 is activated by the ECS, and is signaled to the
generators. Battle Short prevents the EPP III generators from shutting down due to faults
involving
l Oil pressure
l Oil temp-cylinder head
l Generator over temperature
l Under/over voltage
l Battery charging control
The same function can also be activated at the generator.
EMERGENCYFunction
This function is activated by a switch on the ECS and immediately switches the EPP III generator
to idle, i.e. it is disconnected from the power system by de-energization of power contactor K1
(figure 1-6). The function is used, for example, when an overload is detected at the loads or when
cable faults occur, and takes effect when relay K9 (figure 1-11) is activated. The Emergency function
is not effective when the Battle Short function is active, since relay contact 21/22 of K8 interrupts
the circuit of relay K9. In other words, Battle Short takes priority over Emergency.
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