EG&G ORTEC 402D Kullanım ve Servis Kılavuzu - Sayfa 5
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Sayfayı YazdırEG&G ORTEC 402A POWER SUPPLY
1.
DESCRIPTION
The EG&G ORTEC 402A 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 specifications,
Appendix A of TID-20893 (Rev), Type 1, Glass A, adopted
by the AEG Committee on Nuclear Instrument Modules
(adopted by DOE).
The 402A was designed for both foreign and domestic
usage. Input voltage mains of 117 V ac or 230 V ac, 50-65
Hz, may be used. A simple circuit modification permits
operation on 100-V or200-V input mains (see Section 6).
A convenience indicating switch located on the rear of
the Supply clearly identifies the intended main to use.
The primary circuits are fused, and a three-conductor
NEMA-standard power cord is included.
The Supply furnishes four standard dc voltages; +12 V at
2 A, -12 V at 2 A, +24 V at 1 A, and -24 V at 1 A, with a
maximum power capability of 72 W at 50°G. A high-
efficiency heat sink allows additional power dissipation
(see "Specifications"). The dc outputs are regulated,
short-circuit protected, current limited, and thermal
protected.
The 117 V ac is supplied to the Bin connector independent
of input mains. The 117-V 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 50 VA output with a dc load on the power
supply of 72 W.
A control panel is provided on the 4001 A(B) Bin for oper
ating and monitoring the 402A Power Supply. An On-Off
switch, power indicating lamp, thermal warning lamp,
and convenience dc monitor jacks are provided. The ther
mal warning lamp Is lighted when the internal tempera
ture rises to within 20°G 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 Supply regulator amplifiers are located on the
two identical plug-in printed circuit boards, which may
be interchanged for maintenance purposes. Spare regu
lator boards are available. The regulating transistors and
current monitoring resistors for the current limiting are
mounted on a specially designed high-efficiency heat
sink.
The power transistors are virtually indestructible due to
their power handling capability, current limiting, and
short-circuit protection. Ail-silicon semiconductors, 85° G
capacitors with conservative working voltage ratings, and
high-quality carbon and metal film resistors are com
bined to produce this Power Supply which exceeds the
TID-20893 (Rev) requirements.
The dc output voltages are adjustable over a ±1-V range
from their nominal ratings through holes in the top of the
Power Supply cover plate. The 15-turn adjustment poten
tiometers are precision cermet for superior adjustment
resolution and resettabiiity of the output voltages.
2. SPECIFICATIONS
The specifications for the 402A Power Supply meet or
exceed those set forth by the AEG Gommittee on Nuclear
Instrument Modules, TID-20893 (Rev), Appendix A, Type
1, Glass A.
INPUT 103-129 V ac, 50-65 Hz, or 210-258 V ac, 50-65
Hz. Input current at 117 V is 1.8 A fora 72-W dc output.
DC OUTPUT Output at the following ratings +12 V at
2 A, -12 V at 2 A, +24 V at 1 A, -24 V at 1 A, maximum
output power to 50° G ambient, 72 VA; operation to 60° G
ambient with current derated not more than 3%/°G.
Under certain conditions the 72-VA power limitation may
be exceeded to a maximum of 96 VA (see Fig. 2.1).
117 VOLT AC OUTPUT 117-V ac output limited only by
the supply fuse when operating from 117-V ac mains.
Output is limited to 50 VA at 72-VA dc load while operat
ing from 230-V ac mains.
30* C
60" C*
130 260
120/240
> 110/220
100/200
20O464
'Ambient Temp.
30
40
50
60
Total dc Load (VA)
Fig. 2.1. Maxltnuin Sale Operating Range.