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Page Title:
Table II Electric motor ratings |
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|  MI-L-C-13874K
compressor to be lifted in the normal operating position. The provisions shall be
located so that not less than l-inch clearance is maintained between slings and
all exterior parts and shall be fastened to members which will withstand stresses
in the amount and direction of pull specified for the provisions without weld
failure, permanent deformation, cracking, loosening, or breaking of the provision
o r i t s c o n n e c t i n g s t r u c t u r a l c o m p o n e n t s . S l i n g i n g provisions may also be used as
tiedown provisions when such provisions meet the requirements specified in
3.19.2.1.
L i f t points shall be labelled "LIFT HERE". T h e l a b e l s s h a l l c o n f o r m t o
t h e requirements of MIL-STD-1472.
3 . 2 0 E l e c t r i c - m o t o r s . M o t o r wiring and control systems shall conform to the
p r o v i s i o n s of ANSI B15.1.
Electric motor. Unless otherwise specified (see 6.2), each compressor
3.20.1
shall be driven by a single phase, induction, squirrel cage, electric motor,
c a p a c i t o r (drip proof) conforming to NEMA MG-1. T h e e l e c t r i c m o t o r s h a l l h a v e t h e
c o n t i n u o u s h o r s e p o w e r r a t i n g a s s p e c i f i e d i n t a b l e I I T h e horsepower required by
t h e compressor when performing at 200 psig shall be not more than the continuous
h o r s e p o w e r r a t i n g , i n c l u d i n g t h e s e r v i c e f a c t o r , o f t h e m o t o r . T h e motor shall
have all electrical equipment connected for operating on a power supply having the
characteristics as specified (see 6.2) .
TABLE II
Electric motor ratings.
3.20.2 Starter.
A starter shall be furnished conforming to MIL-S-12514, type
I , c l a s s 2 , a n d shall be provided with a NEMA type 12 (dripproof) and dust tight
enclosure . T h e c l a s s 2 s t a r t e r s h a l l b e m a g n e t i c a l l y o p e r a t e d b y a p r e s s u r e
switch tch
The starter shall be reset by an externally operable switch mounted in
motor starter enclosure. The maintained contact stop-start switch and reset shall
be located in an accessible location.
3 . 2 0 . 2 . 1 L o w - v o l t a g e protection.
A low-voltage protective device shall be
provided to open all ungrounded line conductors whenever voltage falls or drops
below a predetermined level or after the operation of the overload protective
device. After the operation of the overload protective device, the reset switch
s h a l l r e q u i r e a c t u a t i o n b e f o r e t h e m o t o r c a n b e r e s t a r t e d . T h e overload
p r o t e c t i v e d e v i c e s h a l l b e r e m o v a b l e a n d r e p l a c e a b l e . T h e holding coil may be
regarded as the low-voltage protective device.
3 . 2 0 . 3 C o n d u i t W i r i n g shall be installed in conduit conforming to WW-C-566,
U L 6, UL 514, or UL 1242, as applicable. C o n d u i t o u t l e t s s h a l l c o n f o r m t o
W-C-586.
3 . 2 0 . 4 P r e s s u r e r e g u l a t i o n . Each compressor shall have an adjustable,
p r e s s u r e - a c t u a t e d e l e c t r i c c o n t r o l . The control shall be adjusted to stop the
m o t o r when the pressure has risen to 200 +0, -10 psig, a n d to start the motor when
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