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Radar System Engineering

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SEC. 14.6] SPEED REGULATORS 575<br />

‘t<br />

I!Ehl<br />

t $$<br />

F?<br />

---<br />

Carbon.pile I Regulating MOio Shunt<br />

voltage<br />

regulator ,<br />

~i:<br />

field<br />

1---- J<br />

Alternator<br />

- ‘~ field<br />

I \<br />

I<br />

-=_ J =<br />

Stabilizing<br />

transformer<br />

i<br />

-<br />

Alternator =<br />

armature<br />

P<br />

field<br />

~“<br />

FIG.14.18.– -Schematic wiring diagram of PU-7 aircraft motor-alternator, 2500<br />

400Cps.<br />

Va. 115 Volta.<br />

115V30 I field #1<br />

Ao<br />

o<br />

B 26v1’$<br />

!<br />

~O115v30<br />

=<br />

I Alternator I<br />

D0.+28V ‘<<br />

input power L tield#2 -I<br />

G- Alternator<br />

I<br />

I<br />

L–<br />

FIG. 1419.-Schematic circuit of Holtzer-Cabot MG-153 aircraft motor-alternator.<br />

output ratings: 750 va, 115 volts, 4Q0 cpa, 3-phase; 250 va, 26 volts, 400 cps, l-phase.<br />

Ground terminal common to all circuits.

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