MIL-P-17574D(YD)
3-wire conductors of a size sufficient to safely carry a current twice the lamp
amperage. The bulb shall be of 40 to 60 watt capacity, shall have voltage
compatible with a generator-battery system, and shall be of a standard
bayonet-socket type.
3.10.4 Line pressure safety switch system. The pump-engine system shall be
equipped with a safety switch system for immediate and positive throttling of
the engine to idle speed. The system shall consist of the following components:
a hermetically-sealed, pressure-actuated, electric high-pressure switch and
low-pressure switch, solenoid, toggle switch with indicating light, and
independent electric circuit with voltage compatible with cranking system.
The safety switches shall be integrated with the engine governor system and
shall control the action of the fuel injection pump. Any one or a combination
of the following high-and low-pressure conditions shall cause the safety-switch
system to function.
a.
A drop in pressure below the preset limits when the flow of liquid
in the upstream (suction) line is cut off, leaving the pump to
operate dry.
b.
A drop in pressure below the preset limits when the liquid is being
wasted because of a break in the downstream (discharge) line.
c.
A rise in the pressure beyond the preset limits due to a block in the
downstream (discharge) line.
3.10.4.1 Pressure-actuated switches. The high- and low-pressure safety
switches shall be exterior, surface-mounted, bellows-type, pressure-actuated,
normally open switches with positive, quick-make-and-break action. The
operating range of the high-pressure switch shall be 90 to 900 pound-force per
square inch (psi) plus or minus 5 percent; the operating range of the
low-pressure switch shall be 10 to 500 psi plus or minus 5 percent. The
switches shall be adjustable for any set point within their respective operating
ranges, The switches shall be connected to the pump discharge nozzle with
suitable copper tubing and fittings.
3.10.4.2 Solenoid. A weather-proof, pull-type, manual-resetting solenoid
shall be securely mounted on the engine with the plunger arm connected to the
diesel fuel injection pump. The solenoid shall be connected by electric cables
to the rest of the control system. When energized, the plunger arm shall act to
have the engine operate at idling speed. Means shall be provided for adjusting
the engine idling speed to the recommended speed when the solenoid is energized.
3.10.4.3 Electric circuit. The wiring shall be arranged so that operation
of the toggle switch will open or close the circuit to the solenoid. When the
toggle switch is in the ON position, the circuit is closed and the indicating
green light shall be energized. When the light is out, this shall indicate the
high- and low-pressure switches have been cut out and that the toggle switch
must be reset before the pressure-actuated safety system functions again. When
the pump-engine system is put into operation and the line pressure is below the
preset low limit, opening of the toggle switch shall permit cutting out the
pressure switches and allow the engine to start.
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