2.2.5.3
Winding Heaters
A heater or heaters shall be installed in the motor frame or end bells or
wrapped around the winding end turns. The heater shall be automatically
turned on when the motor is not running. The heater shall be capable of
withstanding the same temperature extremes as the motor. The heaters shall
be such that when energized the temperature of the motor winding will be
held approximately 10 degrees C above ambient. They shall be designed for
[_____] volts AC continuous operation. The heaters shall withstand 10
percent overvoltage continuously. Terminals of the heaters, including the
leads, shall be watertight. The leads shall be terminated in the motor
lead terminal box.
2.2.5.4
Terminal Leads
The motor leads shall extend outside the frame, shall have insulation
equivalent to that of the motor winding, and shall be terminated in a
two-piece, four-position, watertight, [galvanized] [stainless] steel, NEMA
4X, terminal box secured rigidly to the motor frame. The leads shall be
positioned and sealed where they pass through the frame with a
water-resistant seal of a synthetic rubber material or else with a
synthetic rubber gasket. Conduit entrances to the terminal box shall be
threaded.
2.2.6
Control Components
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NOTES: Where it is desired to control, coordinate,
and program components of a hydraulic fluid power
system to achieve synchronization of cylinders or
components or to achieve a sequence of operations in
several modes, system requirements and
specifications shall be tailored for the job.
a. The programmed controller is used in modern
fluid power systems where a series of operations is
to be performed in a sequential order on each cycle.
It can be programmed to cause a number of hydraulic
cylinders or motors to follow a sequential order of
operations, extending and retracting, starting and
stopping, during each cycle.
b. The controller can be programmable, consisting
of a console plugged into a Central Processing Unit
(CPU), or a specialized microcomputer system that
can be custom programmed to control a wide variety
of electronic and electrohydraulic systems and
components, and has the capability to interface with
other controls and transducers.
Other types of position measurement and control
equipment may be used instead of the electronic
limit switch and transducer combination indicated.
Many other methods of position measurement are
available including some which are entirely
mechanical. The designer shall select the best type
for his application.
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SECTION 15010A
Page 29
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