C
SR 4 GENERATOR
SYSTEMS OPERATION
EXCITATION CIRCUIT
Power for excitation comes from stator (L6) during the
negative half cycle. That is, when (T0) is positive and
(T3) is negative. The current flow is shown on the
opposite page.
For SR 4 Generators with line to neutral power for
excitation & regulation
From (T0) to terminal (26).
From terminal (26) through wire (26) to suppression
reactor (L1).
For SR 4 Generators with line to line power for
excitation & regulation
Front the tapped connection of' phase 1 of stator
(L6) to terminal (22).
From terminal (22) through wire (22) to suppression
reactor (L1).
For A SR 4 Generators
Through suppression reactor (L1) and wire (12) to
suppression capacitor (C2).
From suppression capacitor (C2) through wire (12)
to SCR reactor (L2).
Through SCR reactor (L2) and wire (19) to spade
terminal (19) of rectifier module (A2).
GENERATOR REGULATOR ASSEMBLY
A2
Rectifier module
C2
Suppression capacitor
F1
Fuse
L1
Suppression reactor
L2
SCR Reactor
TP
Thermal protector (it so equipped)
TS3 Voltage regulator terminal strip
From spade terminal (19) of rectifier module (A2) to
heat sink (E3) and the anode terminal of controlled
rectifier (CR9).
NOTE: To make this current flow through the
controlled rectifier possible, a signal voltage must
be sent to the gate of (CR9). Until this signal turns
(CR9) on, the current puts a charge on suppression
capacitor (C2). When the signal is sent to the gate,
controlled rectifier (CR9) "turns on." Current flows
through controlled rectifier (CR9).
From the cathode terminal of controlled rectifier
(CR9) to heat sink (E4).
From heat sink (E4) to spade terminal (8) of rectifier
module (A2).
Through wire (8) to terminal (F1).
Through wire (F1) to the positive end of exciter field
(L3).
Through exciter field (L3) to terminal (F2).
From terminal (F2) through wire (6) to fuse (F1).
From fuse (F1) through thermal protector (TP) and
wire (24) to terminal (24).
From terminal (24) to connection on phase 2 of
stator (L6).
A2 RECTIFIER MODULE
E3
SCR Heat sink
E4
Field rectifier heat sink
CR9 Controlled rectifier
26
