MIL-W-80037C
to filter the fuel before it enters the fuel injection pump. The filter
shall be of the replaceable cartridge type.
3.5.3 Welding generator, exciter, and auxiliary power supply.
3.5.3.1 Welding generator. The generator shall conform to the standards
in the NEMA Publication EW-1. The generator shall be the conventional con-
stant current self-regulating type, with a drooping volt-amoere characteristic.
The rotor shall have a double-sealed anti-friction bearing, and shall be
close coupled to the engine to maintain alignment with the engine flywheel.
3.5.3.2 Exciter. The exciter shall be integral with the welding generator,
or be separate and mounted on the same shaft as the main welding generator.
The exciter shall have fast voltage buildup, and be designed to prevent
polarity reversal. The commutator, brushes and holders shall be readily
accessible for servicing and maintenance.
3.5.3.3 Insulation. The maximum allowable temperature rise of insulated
parts of the machine shall not exceed the temperature limits of NEMA-EW-1 for
the class of insulation system used.
3.5.3.4 Generator instruments. The generator for the Type II, III and IV
machines shall have a voltmeter to register the voltage at the welding output
terminal and an ammeter to register the current during the welding operation.
A combination volt-ammeter may be used. The meters shall be flush mounted and
adequate to within three percent of full scale reading.
3.5.3.5 Generator output terminals. The terminals shall be of the stud,
and wing or hex nut type.
he studs shall be not less than 1/2 inch in diameter
and shall be recessed-, protected, or located to prevent accidental contact.
For units not equipped with a polarity reversing switch, the output terminals
shall be
identified as positive or negative.
3.5.3.6 Generator controls. The controls shall be mounted in a panel on
the welding generator end of the machine. The controls shall be designed for
easy operation with a gloved or mittened hand.
3.5.3.6.1 Current control. Two controls shall be provided to
control and
set the desired welding current range. One control or series of
taps shall
control the current through the entire range of the machine; the
other shall
be provided for fine stepless adjustments within the settings of
the current
control.
3.5.3.6.2 Remote current control. When specified the Type II, III and IV
machines shall have a remote control to make fine adjustments at the work on the
coarse generator current control. The remote control cable shall have connections
suitable for using longer extensions. The length of the remote control cable
shall be as specified see 6.2.1).
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