Appendix
D
Power
Requirements and Grounding
0.1 POWER REQUIREMENTS
The Model
880
Printer can operate over four
ranges
of
single-phase RMS voltages.
•
100Va.cnominal
+10%,-15%
•
120
Vac nominal + 10%,
-15%
•
220
Vac nominal + 10%,
-15%
•
240
Vac nominal + 10%,
-15%
CAUTION
Refer
to
the
identification
label
on
the
back
of
your
printer
for
correct
voltage
levels.
An
incorrect
voltage
can
cause
damage
to
the
printer.
The Model 880 will operate normally from
ac
mains at
47
to
63
hertz.
WARNING
Do
not
use a
power
receptacle
that
does
not
accept
a
three-wire
plug.
Do
not
cut
the
ground
pin
from
the
plug.
An
electrical
hazard
can
result.
0.2
SAFETY CONSIDERATIONS
For the safety
of
the operator, and for correct
operation, the printer must
be
connected
to
ground by inserting the power cable into a com-
patible three-pin receptacle which
is
connected
to
ground
as
specified by the National Electrical
Code
and local codes and ordinances. The fol-
lowing conditions can cause possible hazards
or
can cause faulty printer operation:
•
•
•
•
•
Open safety ground
Safety ground connected
to
the hot lead
Safety ground connected
to
the neutral
lead
in
the receptacle
Safety ground connected
to
conduit only
Hot and neutral connections reversed
in
receptacle
If
a wall receptacle
with
correct wiring
is
not
avail-
able, the user must have a correct receptacle
installed by a qualified technical person.
For correct operation,
it
is
recommended that the
printer not
be
installed on the same circuit
with
copy machines, water coolers, or similar devices
that cause power-line transients.
If
faulty printer
operation occurs
as
a result
of
the operation
of
other devices, the user must connect the printer
to
a different circuit or install devices
to
suppress
transient voltages.
0.3
EARTH GROUND
In
some installations the earth ground
of
the
power receptacle
is
provided by a metal conduit
that connects
to
the neutral phase at the circuit-
breaker box.
As
determined by site conditions,
this metal conduit can conduct current from other
sources that can cause faulty operation
of
a
printer connected at the receptacle. To prevent
this occurrence,
it
is recommended that the earth
ground and neutral
be
isolated from the conduit
(except at the circuit-breaker)
for
the computer
system and printer circuit
as
shown in Figure 0-1.
This will assure
that
the protection ground con-
ducts only fault and leakage current from the
printer or computer system.
0-1
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