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Section 1. Basic Unit
Danger
After the emergency power switch is opened, power is
available at Kl, K3, and K9 input terminals and at trans-
former (Tl) terminals.
If
the redesigned power control
box is installed (printed circuit relay panel), power is
not applied to the input terminals of K9 after an
emergency power off.
Replacements of power supply components generally fol-
low the replacement philosophy of the system; that is, re-
placement is limited to voltage regulator cards, fuses, and
relays. However, in some cases it
will
be necessary to re-
place the series regulator and the filter capacitors.
5.1
INPUT POWER REQUIREMENTS
The input power requirements for System/3 are 3-phase
power at 30A. Domestic and World Trade input voltage
requirements are:
1.
60 Hertz-200 Vac, 208 Vac, and 230 Vac (± 10%).
2.
50 Hertz-200 Vac, 220 Vac, 235 Vac, 380 Vac, and
408 Vac (± 10%}.
3.
Procedures for converting 208 Vac input to 230 Vac
input can be found in
5410 Logic,
page YAIOO.
5.2
POWER SUPPLY OUTPUTS
Figure 5-1 shows the power supply outputs, the location of
each supply, and the primary use of each supply. The sys-
tem supplies -30V, +6V, and -4V. The +6Vand -30V gen-
erate (respectively) an internal BSM +3V and -14V. (The
-30V is a temperature compensated drive voltage for use in
the BSM.)
Page of SY31-0244-2
Revised December 1, 1971
By TNL: SN31-0307
Chapter 5. Power and Cooling
•
BASIC SYSTEM SUPPLIES
Supply
Amperes
Where Used
Location
-4V
70A
Logic Voltage
CPU
+6V
15A
Logic Voltage
CPU
-30V
9.5A
Storage
CPU
+24V
25A
MFCU
MFCU
+GOV
11A
Printer, MFCU
Printer
+24V
SA
Control Voltage
CPU
+3V
Storage*
CPU
-14V
Storage*
CPU
7.25 Vac
**
Indicator Lamps
CPU
41 Vac
Use Meter***
CPU
*
+6V supply voltage dropped to +3V in storage module.
-30V supply voltage dropped to -14V in storage
module. (See Figure 5-2 for card locations.)
**
25A in early design machines, 16A in redesigned
power control box only.
***
Applies to redesigned power control box only.
•
FEATURE SUPPLIES
Supply
Where Used
Location
-12V
BSCA
CPU
-JV
1442
CPU
+3V
1442
CPU
+6V*
Special Features
CPU
*Replaces 15A logic voltage supply when installed.
Figure 5-1. Power Supply Outputs
5.2.1 Checks and Adjustments
All voltage measurements should be made in a normal en-
vironment (temperature between 68 degrees and 86 degrees
I
F) with a
recently calibrated
Weston 90 I meter or its
equivalent.
5410 MM
5-1
E
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