MIL-DTL-2212K(SH)
6.8.23 Dripproof. Dripproof means constructed or protected so that falling dirt or drops of liquid will not
interfere with the successful operation of the apparatus under specified test conditions.
6.8.24 Dropout, voltage or current. The dropout voltage or current of a magnetically operated device is the
voltage or current at which the device will return to its de-energized position.
6.8.25 Duty of a controller. The duty of a controller is the specific function or functions for which it is
constructed with respect to the operation of the motor. These include starting, speed control, reversing, stopping,
and the frequency and length of time of operation.
6.8.26 Duty, continuous. Continuous duty is a requirement of service which demands operation at a
substantially constant load for an indefinitely long time.
6.8.27 Duty, intermittent. Intermittent duty is a requirement of service which demands operation for alternate
intervals of (1) load and no-load, or (2) load and rest, or (3) load, no-load and rest; with such alternate intervals
being definitely specified.
6.8.28 Duty, varying. Varying duty is a requirement of service which demands operation at wide variations of
loads and intervals of time.
6.8.29 Emergency run. Emergency run is a condition in which the protective devices that normally interrupt a
control circuit are temporarily and manually overridden by some means, and cause the circuit function to be
maintained.
6.8.30 Enclosure. An enclosure is a surrounding case designed to protect:
a.
Personnel against accidental contact with the enclosed electrical devices, and
b.
Internal devices against specified external conditions.
6.8.31 Equipment. Equipment, as used herein, means controllers, controller parts, and associated switching
devices.
6.8.32 Failure of a control component or system. Failure is a state or condition in which a control component
or system does not perform its essential functions when its ratings are not exceeded.
6.6.33 Features, distinctive. Distinctive features are exclusive elements which are characteristic of a particular
design which are not common to other designs.
6.8.34 Fuse. A fuse is an overcurrent protective device with a circuit opening fusible member which is heated
and severed by the passage of over-current through it.
6.8.35 Grounded parts. Grounded parts are parts which are connected in an intentionally grounded manner.
6.8.36 Input and output characteristics. Input devices accept signals from the process elements and translate
them into signals which can be used within the controller. Output devices convert controller signals into external
signals used to control the process.
6.8.37 Insulation. The temperature limits on which the ratings of electrical apparatus are based are largely
determined by the character of the insulation materials used.
a. Insulation is considered to be impregnated when a substance provides a bond between components of the
structure and a degree of filling and surface coverage sufficient to ensure adequate performance under the extremes
of temperature, surface contamination (moisture, dirt, and so forth) and mechanical stress expected in service. The
impregnant should not flow or deteriorate at operating temperatures so as to seriously affect performance in service.
b. The electrical and mechanical properties of the insulation should not be impaired by the prolonged
application of the limiting insulation temperature permitted for the specific insulation class. The word "impaired" is
used here in the sense of causing any change which could disqualify the insulating material for continuously
performing its intended function, whether creepage spacing, mechanical support or dielectric barrier action.
43
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business