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Radar System Engineering

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562<br />

PRIME POWER SLTPPLIES FOR RADAR [SEC. 14.4<br />

~~<br />

Primary<br />

contactor<br />

LzJ 9<br />

I<br />

[ ~__<br />

. . . . .<br />

-, C..,- ,=.‘,”,.<br />

,,.,.<br />

J<br />

Fm.<br />

14.4.—Motor circuit of 1500-va and 2500-va inverters showing starting relay<br />

contractors.<br />

and<br />

Primary<br />

Shunt field<br />

Swiesfield<br />

Start<br />

0<br />

Startingrelay<br />

FIO. 14.5.—Addition of auxiliary starti,,g rela~- to circuit of Fig. 144.<br />

w<br />

‘“’x”~<br />

/-,<br />

10–<br />

8 -<br />

6<br />

/\<br />

/ ‘\<br />

\<br />

I<br />

I \<br />

!<br />

I<br />

i \<br />

\<br />

\<br />

\<br />

——— Current to unmodified<br />

machine<br />

— Represents machines<br />

with aux!llary stat’hng<br />

relay<br />

: ~<br />

-.—<br />

o<br />

0 0.2 0.4 0.6 0.8 1.0 1 2<br />

Time in seconds<br />

FIG. 14.6.—Startingcurrent of 1500-vamotor-alternator, Signal Corps Type PE-218-D.<br />

No load cmalternator.

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