EG&G ORTEC 402A Operating And Service Manual - Page 10

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11
EG&G ORTEC 402D POWER SUPPLY
1.
DESCRIPTION
The EG&G ORTEC 402D Power Supply Is designed to be
mounted in the space provided on the rear of the
4001 A(B) Modular System Bin. The Supply was designed
to exceed the recommended power supply specifica
tions, Appendix A of TID-20893 (Rev 3), Type V-H,
adopted by the AEG Committee on Nuclear Instrument
Modules (adopted by DOE).
The 402D was designed for worldwide usage. Input volt
age mains of 117 V ac or 230 V ac. 47-63 Hz, may be used.
A convenience Indicating switch clearly identifies the
intended main to use.
The Supply furnishes six standard dc voltages, +24 V at 1
A, -24 V at 1 A, +12 V at 2 A, -12 V at 2 A, +6 V at 8 A and
—6 V at 8 A, with a maximum power capability of 132 W at
50°C. The dc outputs are regulated, short-circuit pro
tected, current limited, and thermal protected.
The 117 V ac is supplied to the Bin connector independ
ent of input mains. The 117-7 ac power available Is
limited only by the Power Supply fuse when operating
from 117-V ac mains. When operating from 230-V ac
mains, the 117-V ac Is derived by autotransformer action
and is limited to 60 VA output with a dc load on the Power
Supply of 132 W.
A control panel is provided on the EG&G ORTEC
4001 A(B) Bin for operating and monitoring the 402D
Power Supply. An On-Off switch, a power indicating
lamp, a thermal warning lamp, and convenience dc moni
tor jacks are provided. The thermal warning lamp Is
lighted when the internal temperature rises to within
20° C of the maximum safe operating temperature. The
Power Supply Is automatically cut off by an internal
switch should the temperature exceed the maximum safe
operating temperature.
The power transistors are virtually indestructible due to
their power handling capability, current limiting, and
short-circuit protection. Silicon semiconductors, 85° C
capacitors with conservative working voltage ratings,
high-quality-carbon resistors, and metal film resistors are
combined to produce the 402D Power Supply, which
exceeds the TID-20893 (Rev) requirements.
The dc output voltages are adjustable through holes in
the top of the Power Supply cover plate, over a ±2%
range from their nominal ratings. The adjustment poten
tiometers are 20-turn cermet potentiometers for superior
adjustment resolution and resettability of the output volt
ages.
2. SPECIFICATIONS
INPUT
100 to 129 V ac, 57-63 Hz, or 200 to 258 V ac,
47-53 Hz. Input current at 117 V is 3.5 A for a 132-W dc
output.
i
DC OUTPUTS The Supply provides six simultaneous
dc outputs with the following current ratings:
VOLTAGE (V)
+24.00
-24.00
+12.00
-12.00
+ 6.00
- 6.00
CURRENT (A)
0 to 1
0 to 1
0 to 2
0 to 2
0 to 8
0 to 8
Maximum output power from 0 to 50° C ambient is 132 W.
Operation to 60° C ambient, with current derated not
more than 3%/°C for temperatures above 50° C.
117-V AC OUTPUT 117-V ac output is limited only by
the Supply fuses when operating from 117-V ac mains.
Output is limited to 60 VA at 132-W dc load while operat
ing from 230-V ac mains.
REGULATION
±0.1 % (typically ±0.05%) for ±12 V and ±24 V, and ±0.2%
(typically ±0.1%) for ±6 V over the combined range of
zero to full load and input voltage of 100 to 129 V ac or
200 to 258 V ac, when measurements are made within a
period of 1 min.
±0.3% (±12 V and ±24 V) and ±0.6% (±6 V) over any
24-hr period at constant ambient temperature over the
combined range of no load to full load and input voltage
of 100 to 129 V ac or 200 to 258 V ac, after a 60-min
warmup.
STABILITY
Long-term stability over a 6-month period
is better than ±0.5% after a 1 -hr warmup at constant load,
line, and ambient temperature.