Storage Battery Systems, Inc. MANUAL PSC
7
Theory of operation
T1
: the AC supply is transformed and isolated.
SCR
: the transformer secondary voltage is rectified by a full-wave, half-controlled bridge.
L1, C1
(optional) : the rectified DC voltage is smoothed by lC filter section.
Shunt
: current and voltage reading sent to the control board
F1
: a fuse protects the SCR's and diodes.
Control Board
: the
PC20/21
series control board provides automatic charge control, precise voltage regulation,
alarm status annunciation and display.
A
V
V REG
MONITORING
t
V
IN
AC
t
V
A LIMIT
t
V
+
OUT
MONITORING
DC
MANUAL
INPUT
I / P
DISPLAY
ALARMS
O / P
SEQUENTIAL
ACCESS MSG
MODE FLt
Eq
Ok
Exit
F1
F2
F3
F4
CONTROL BOARD PC 20/21///////
T1
SCR
L1
F1
Shunt
