MIL-DTL-2212K(SH)
3.3 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered,
environmentally preferable, or biobased materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous
life cycle costs.
3.4 Power.
3.4.1 AC controllers. AC controllers shall operate on Type I, 60-Hertz (Hz) power as specified in
MIL-STD-1399-300 and shall operate between 80 and 110 percent of rated voltage at the specified ambient
temperature (see 6.8.2).
3.4.1.1 AC input. The AC input to the controller shall be the voltage and phase(s) specified (see 3.16.14a
and 6.2).
3.4.2 DC controllers.
3.4.2.1 Surface ships. DC controllers shall operate between 80 and 110 percent of rated voltage at the specified
ambient temperature.
3.4.2.2 Submarines. DC controllers shall operate at the specified ambient temperature between 180 and
355 (nominal 250) volts (V) DC.
3.4.2.3 DC controllers with field rheostat (see 6.8.75). DC controllers having a motor speed adjustment by
field rheostat exceeding a speed range of 1½ to 1 shall provide full field starting and field acceleration features
(see 6.6.33).
3.5 Connection diagram and table of overload heaters and reactors. Each controller shall include a connection
diagram, a schematic diagram, a description of operation, and a table of overload heaters, coils, and reactors (if
used). The information shall be printed by a process that is nonfading, protected by transparent plastic, and secured
inside of the enclosure (see 6.8.30). This information shall be readable and shall be as large as practical based on
the size of the controller enclosure, but not to exceed 8.5 by 11 inches.
3.6 Duty (see 6.8.25). Unless otherwise specified (see 6.2), controllers shall be constructed for continuous duty
(see 6.8.26) and general purpose service (see 6.8.77). For special duty such as jogging (see 6.8.40) or plugging,
constant current multi-speed motors, lighting or transformer loads, special ratings (see 6.8.59) may be required as
specified (see 6.2).
3.7 Circuit arrangement. Circuit arrangements shall be as follows:
a.
Controllers shall operate on an ungrounded system.
b. Each controller shall be electrically independent, except for interlocks (see 6.8.38), and will normally
derive its power from the same source as the controlled device. Unless otherwise specified (see 6.2), control circuits
(see 6.8.12) shall be the same voltage as the power circuit. Control circuits shall be protected by fuses (see 6.8.34)
upstream of all control components, including transformers.
c.
A fault in one controller shall not disable any non-interlocked controller.
d.
Current transformer secondaries shall be grounded (see 6.8.35) to the controller enclosure.
e.
Main line fuses, disconnects, or circuit breakers shall not be provided as part of the controller.
f. Contacts (see 6.8.8) shall not be connected in parallel to obtain higher current carrying capacity. Line
contacts (see 6.8.10) of one contactor shall not be used to maintain power to another contactor unless tests, in
accordance with 4.6.5, have been made to ensure that a shock will not cause the maintained contactor to drop out.
g. Multi-speed and reversing (see 6.8.74) controllers shall be arranged so that speed and direction changes are
effected by a single operation. It shall not be possible for a motor to be in a different mode of operation than
indicated by the associated switching device's identification plate. Multi-speed and reversing controllers shall use
electrical and mechanical interlocks to prevent attempted operation in more than one mode.
h. When timing relays are used to bypass safety switches during the starting period, the circuit shall be wired
so that an opening in the relay circuit will prevent starting of the motor.
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