S/5
TM
8-Module Frame, F-CU8 -12
5
Document no. M1125635-05
Figure 4 Mains part and battery inlet switch block diagram (F-CU8, rev. 12)
Power supply board
Rectifiers
Rectifiers processes 21 VAC from the mains transformer.
Power factor correction
Power factor correction is performed in a pre regulator. The regulator modifies output current
from sinusoidal power lines into sinusoidal form. Its purpose is to boost efficiency of the mains
transformer.
Battery charging
Batchrg charges the 6 V CPU battery which maintains the supply voltage of CPU for 15 minutes
after the power is cut off. The battery is charged as long as the power cord is connected to the
mains outlet.
-15 V converter
-15 V converter is a Flyback-type chopper power supply that generates -15 V voltage from +32
V. The load capacity is 200 mA (7.5 W).
+15 V converter
+15 V converter is a Buck-type chopper power supply that generates +15 V from +32 V.
The output of the power supply is divided into two; +15 Va for analog voltage and +15 Vd for
less sensitive components.
+5 V converter
+5 V converter is a Buck-type chopper power supply that generates +5.1 V from +32 V. The load
capacity is 8 A (40 W).
+5 V, +15 V, +32 V, and +5 Vcpu checking
Those voltages are checked and if one of them increases more than is allowed, thyristor pulls
the rectified +32 V down.
fcu8_mainspart&disp_outlet_diag_rev_10.vsd
Appliance inlet
External
battery
in, 24 Vdc
Power logic
board
Power supply
board
PE
Supply
mains
L
N
F1
F2
BN
BU
GNYE
RD
YE
F1 T10A
21V
30
PE
LN
Equipotentiality
The contact positions of
the appliance inlet by
locking at the
engagement face of the
appliance inlet
L* and N* in Display outlet are
separated from the Supply
Mains' potentials L and N.
GNYE
Nominal Mains
Voltage
Battery switch
board
8
Slow 5 A
Slow 5 A
T 2.5 A
100 V
110 - 120 V
220 - 240 V
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