MIL-P-53108(ME)
operator. When the two-position switch is in the automatic discharge pressure control position, the set point adjustment will establish the discharge pressure delivered by the pump as selected by the operator. Rotation of the set point adjustment shall be clockwise going from lowest to highest setting.
3.13.2 Manual engine speed control. In the manual engine speed control mode position, the pump speed shall be isochronously controlled; that is, the engine/pump speed shall stay at the speed selected by operating personnel using the "set point adjustment", irrespective of pump discharge pressure, up to the maximum allowable engine speed provided none of the other shutdown devices (high coolant temperature, low lubricant oil pressure, or low pump suction pressure) have operated. The "manual engine speed control" mode position must be used to permit engine starting and the low range of the "set point adjustment" device used for engine warm up.
3.13.3 Automatic discharge pressure control. In the "automatic discharge pressure control" mode, the automatic engine/pump controller shall operate in conjunction with an electronic speed control governor, which would regulate engine speed to maintain the respective discharge pressure corresponding to "set point adjustment" position selected by the operator. The suction pressure control function shall override the discharge pressure control function in the event adequate suction pressure is not available to the pump to achieve the desired discharge pressure. The suction pressure set point adjustment shall be accessible from the side or back of the controller for adjustment by personnel using common hand tools.
3.13.4 Pressure ranges. The discharge pressure controller and associated transducers shall have an adjustable working range of 0-900 psig. The suction pressure control and associated transducer shall have an adjustable working range of 0-150 psig. The automatic engine/pump controller shall be factory set to the following values: low pressure override - 20 psig; maximum discharge pressure - 760 psig.
3.14 Instrument panel. The pump unit shall incorporate a steel instrument panel, rigidly mounted on the suction side of the pump in a readily accessible area to enable the operator to read the pump gages, perform operational procedures and the required maintenance to the controls and indicators, and to repair or replace the panel if required. The panel shall be completely enclosed with a hinged door with locks and shall be weatherproof. The panel shall
include sufficient lighting to allow the operator to read all pump and engine gages and operate all
pump and engine controls in otherwise total darkness. Replacement of light bulbs shall require
no tools. Instrumentation shall include, but not be limited to, an electric tachometer/hourmeter, a
voltmeter gage conforming to MS24532-2, a lube oil pressure gage conforming to MS24540-2, a coolant water temperature indicator gage conforming to MS24543-2, two shock-, vibration- and corrosion-resistant pressure gages conforming to ANSI B40.1. The suction gage shall have a pressure range of 0-400 psi and the discharge gage shall have a range of 0-1000 psi. The suction gage shall have an overpressure range of at least 900 psi and the discharge gage shall have an overpressure range of at least 1500 psi. The dials shall be white with black calibration lines and figures and shall be not less than 4-1/2 inches in diameter. All gages shall be labeled according
to function (i.e., TEMPERATURE, ENGINE SPEED, etc.) and color coded as specified in 3.8.
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