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5.1 GENERAL INFORMATION
Electrical power requirements for the 2025
processing unit and integrated input/output
attachment features..
including the
associated I/O devices. are supplied
through the 2025 processing unit.
The ac service into the 2025 processing
\lllit is 208/230v. 60 amps. 3-phase. 60 Hz
ac for domestic rcachines.
For World Trade
machines. provision is made for 50 Hz.
195/22 0/235V .• delta input. or 50 Hz.
380/ 408V. Y-input.
The de supplies are ferroresonant for
all levels.
The de supplies are sequenced.
The ac
power to the 2311 disk drives and the 2560
MFCM
is also sequenced.
Some of the power supplies and
associated components are used only with
cert.ain integrated I/O attaclments.
Where
possible. these components are specified in
feature groups. and are installed only when
the associated features are installed.
The fallowing is a listing of the power
sui:pli es
by
group.
Basic Power Group:
+3
50A
-3 Gl
30A
+6
@
40A
+ 12
@
13A
-12
@
13A
-30
@
SA
Core storage
7.25V
ac
@
2Console indicators
41V ac
@
Meter power pack
115V ac
@
15A
Convenience outlets and
1052 motor
+24
@
4.SA
sequence circuitry
Ferrotransf armer Tl Supplies:
+48
@
3A
Console typewriter.
communications
Power requirements supplied from the
processing unit for integrated I/O
attachment devices are as follows .•
1403/2540 Power Group:
-6
@
4A
-20
GI
4A
1403 Power Group:
+6
@
16A
+60
@
20A
Hammer drivers
Hammer drivers
Chapter S. Power Supplies
2311 Power Group:
-36
@
2A
2560/Communications Power Group:
+3
@
45A
+6
@
32.Pi
2560 Power Group:
+20
@
lA
5.2 INPUT POWER
Input power for domestic installations is
208 volts ±103 or 230 volts ±103. 60 ±.5
hertz, 60-amperes three-phase four-wire
(the fourth wire is equipment ground)
shielded cable.
The shield and ground wire
are bonded to the input line filter case at
the cable entry point.
Input power for World Trade
installations is 200. 220,, 235/380, or 408
volts ±10%, 50 ±.5 hertz. 60-amperes
three-phase five-wire shielded cable (the
fourth wire is neutral for a
WYE
system and
not used on DELTA, and the fifth wire is
equipment ground.
The shield and ground
wire are bonded to the input line filter
case at the cable entry point.
An
autotransformer is provided for 200 volts,
235 volts, or 408 volts, 50 hertz inputs.
Power supply logics
YA
011, YA 092, and.
YA 101 show input connections to voltage
sensitive units and
YA
031 shows the power
on/off sequence.
The 20 25 power supply is
described in detail under Power Supply in
the
IBM
2025 FE Theory of Operations
Manual., Form Y24- 3527.
5.3 POWER CONVERSION
Ferroresonant regulators feeding full -wave
bridge rectifiers are used to transform the
systems
ac
input voltage to the de voltage
required by the series regulators and the
special power requiranents.
The special
power requirements do not require close
regulation.
5.4 AC OUTPUTS
5.4.1 CONVENIENCE OUTLETS
For domestic machines, two convenience
outlets provide 115 volts,, 60 hertz., single
20 25
FEMM
(7/69)
5-1
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