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POWER AND ENVIRONMENT AL CONSIDERATIONS
A-C POWER REQUIREMENTS
The GE/PAC 4020 computer operates on a 115/
230 volts a-c circuit, single-phase, three-wire.
The central processor draws approximately 6. 2 kva
at 0. 9 power factor. The GE/PAC 4020 computer
will operate successfully despite slow+ or -10%
line voltage variations and + or -1 % ( + or -3%
optional) frequency variations. Faster changes
within these limits and any change outside them,
including complete loss of line power, will cause the
computer to sequence itself off safely.
RESTART FEATURES
When the GE/PAC computer is turned on, turned
off or sequences itself off, the logic voltages, core
current source, internal a-c power and process
1/0 d-c power supplies are sequenced so that the
machine is not damaged internally, the contents
of core and bulk memory are protected, and the
analog input scanner and multiple output distributor
do not make erroneous or multiple operations, and
so do not upset or "bump" the process in any way.
An automatic restart option will sequence the
system back on and into program if the power comes
back on and stabilizes within limits within two
seconds to 10 minutes after it went off or out of
limits. After
10
minutes, the process is assumed
not to need the computer's services, though of
course the process operator can start it up any time
he wishes.
BACKUP POWER SUGGESTIONS
Backup a- c power is recommended only if the
GE/PAC 4020 computer must continue to operate
during power line fluctuations and outages. Al-
though solid- state rectifier /battery/ inverter sys-
tems continue to improve, the best operation from
a reliability viewpoint to date has been provided
by
propane engine/motor/generator sets.
In
any
event it is best not to connect the GE/PAC 4020
computer to a line supplying variable large motor
loads but rather to get as close to the plant's pri-
mary a-c source as convenience and economics
permit.
TEMPERATURE, HUMIDITY, CORROSIVE
ATMOSPHE
1
RES
Temperature:
Humidity:
Shock:
Vibration:
Atmosphere:
0-55°C
5-95%
Shipping, 5 G's for 11 ms. on
each of three mutually-
perpendicular major axes.
In-
stalled, 2 G's.
5 to 55 cps at . 015" displacement.
Dust from material such as steel
scale, coal, cement, paper, and
lint. (Particles 10 microns and
larger are removed by internal
air filters.)
Corrosive atmospheres containing
"normal" concentrations of salt,
chlorine, sulfur gases, oil mist,
and gas by-products from natural
gas and coal furnaces. "Normal"
concentrations of the more com-
mon contaminants are defined as
not more than 10 ppm of chlorine
(gas), hydrogen sulfide, sulfur
dioxide and sulfuric acid (aerosol
vapor), and not more than 0.1 ppm
or chlorine dioxide. (Note: these
are the lethal dose parameters for
humans.)
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