MIL-S-26716A (USAF)
*
Belt driven equipment shall not be used.
3.7.1.15 Belt drives.
3.7.1.16 Vibration
All motor sets shall be shock mounted to reduce
vibration and noise to minimum. The shock mount ing shall effectively
insulate the assembly from the test unit so as not to transmit any
perceptible vibration to the installed instruments.
*
Variable speed drives shall be solid
3.7.1.17 Variable speed drives.
state electronics controlled DC motor drives and shall be suitable for the
intended application,
Minimum and maximum operating speeds, horsepower values
for the various operating speeds, type of drive (reversing or nonreversing). and
type of speed regulation (nonautomatic or automatic), shall be as specified in
the detail specification.
The speed control shall provide infinitely variable
3.7.1.18 Controls.
adjustment throughout the speed range.
Allowable hysteresis, creep or
backlash shall be as specified in the detail specification and shall be one
of the classes listed in 3.7.1.18.1 below.
Automatic speed regulation shall be specified in
3.7 .1.18.1 Regulation.
the specification and shall be one of the following classes:
Class
1
0.5 percent
Class
2
0.25 percent
Class
3
0.1 percent
Class
4
0.04 percent
* Speed Regulation = (No load RPM) - (Full load RPM) x 100
--
(No load RPM)
*
The maximum deviation from the set speed, upon
3.7.1. 18.2 Response.
sudden variation of load shall not exceed 1 percent of the set speed. This
deviation shall occur in the direction of load change only, with no
subsequent overshoot.
All transients resulting from sudden load variations
or sudden changes in the set speed shall be effectively damped out in less
than 0.5 second.
*
The DC control shall be suitable for operation
3.7 .1.18.3 DC control.
over the specified speed and horsepower range.
*
A motor field loss relay shall be provided,
3.7 .1.18.4 Field loss relay.
which shall shut the drive down should the motor lose its field.
Provision
shall be included to prevent the drive motor from being started, unless the
speed setting rheostat is set for minimum speed,
3.7.2 Hydraulic System
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