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Performance requirements and product characteristics |
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|  MIL-T-22913C(OS)
3.2.7 Threads. Unless otherwise specified, all threads shall be in
accordance with the National Bureau of Standards Handbook H28. The
class or fit for threads shall be as specified on the applicable
drawings.
3.2.8 Conflicting requirements. In the event of conflict between
the documents referenced herein and the contents of this specifica-
tion, the contents of this specification shall apply.
3.3 Performance requirements and product characteristics. The timer
shall meet the following performance requirements and product character-
istics:
3.3.1 Performance requirements
3.3.1.1 Motor input
(a) Voltage. The input voltage shall be 3 phase, 115 volts rms plus
or minus 3 percent average line to line voltage, with the difference be-
tween any two line voltages not exceeding 12 volts rms.
(b) Frequency.
The input frequency shall be 400 Hz plus or minus 2
percent.
(c) Power. The input power to the timer motor, when operating the
steady state mechanical load imposed by the switches and potentiometers
specified herein, shall not exceed 20 watts.
3.3.1.2 Starting response time. The timer motor shall have sufficient
starting torque to ensure that, from every possible rest position of the
cam shaft, the timer will reach its steady state operating speed within
five seconds after the following applicable voltage is applied:
Three phase, 90 volts rms average line-to-line voltage maximum 400 Hz
plus or minus 2 percent. The difference between any two line-to-line
voltages shall not exceed 12 volts. Steady state operation shall be con-
sidered to exist if circuit 1 repeat-cycles in 1250 milliseconds (ma)
plus or minus 27 ms.
3.3.1.3 Switch circuits
3.3.1.3.1 Circuit time. The timer motor, energized as specified in
3.3.1.1(a) and 3.3.1.1(b), shall cause one cycle of operation in each
circuit listed in Table I to be 1250 plus or minus 27 ms and repeatable
within 2 ms. The time required to complete one cycle of operation in
circuits 6 and 7, listed in Table II, shall be 20 seconds plus or minus
220 ma and repeatable within 32 ms.
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