Pro-face FP-790T, User Manual

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FP-790T User Manual 3-7
Installation and Wiring
•
Be sure the surge absorber
(E1) is grounded separately
from the FP (E2).
• Select a surge absorber that
has a maximum circuit
voltage greater than the
power supply's peak voltage.
3-2-3 FP Power Supply Connection Procedures
Please pay special attention to the following points when connecting the power
cable to the FP-790T's Terminal Block.
• Between the line and ground, se-
lect a power supply that is low in
noise. If there is an excessive
amount of noise, connect a noise
reducing transformer.
Use Voltage and Noise Reduc-
ing transformers with capaci-
ties in excess of 100VA.
• When supplying power to the FP,
separate the power input/output
and operation signal lines as shown
in figure 3.
• To increase the FP's noise resistance,
twist the power cable before con-
• If the voltage supplied exceeds the
FP's designated range, connect a
voltage transformer.
Chapter 2, "Speci-
fications", for the allowable volt-
age range.
necting it to the FP.
• The power cord must not be bun-
dled or kept close to the main cir-
cuit lines (high voltage, high cur-
rent), or input/output signal lines.
• Connect a surge absorber, as shown
in the diagram, to deal with power
surges.
• To prevent noise, make the power
cord as short as possible.
power
input/output
power
input/output
FP
Twisted
Lines
Twisted
Lines
isolating
transformer
FP
main
power FP
power
FP
input/output
unit
main
power
FP
power
FP
c o n s t a n t
voltage
transformer
Input/ Out-
put Unit
Input/ Out-
put Unit
Operation
Unit
main circuit
FP
surge
absorber
Fig.1
Fig.2
Fig.3
Fig.4
Fig.5