Proface FP3900 - 19 Flat Panel" - Manual (Page 55)

FP-3710K Series User Manual
5-10
5.2.3 Connecting the Power Supply
• If the power supply voltage exceeds the FP unit’s spec-
ified range, connect a constant voltage transformer.
• For between the line and ground or between the lines,
select a power supply that is low in noise. If there is an
excess amount of noise, connect an insulating trans-
former.
• When supplying power to the FP unit, please separate
the input/output and operation unit lines, as shown.
• To increase the noise resistance quality of the power
cable, simply twist each power wire before attaching
the Ring Terminal.
• The power supply cable must not be bundled or posi-
tioned close to main circuit lines (high voltage, high
current), or input/output signal lines.
• Connect a lightning surge absorber, as shown in the
diagram, to deal with power surges.
• To avoid excess noise, make the power cable as short
as possible.
• The temperature rating of field installed conductors:
75
o
C only.
SEE 4 Specifications (page4-1)
• Use the constant voltage
transformer and the insulating
transformer with capacities of the
rated value or more.
• Be sure to ground the surge
absorber (E1) separately from the
FP unit (E2).
• Select a surge absorber that has a
maximum circuit voltage greater
than the power supply’s peak
voltage.
Main
Power
FP
Power
T1
T2
Main Circuit Power
FP Unit
Input/Output
Unit
Input/Output
Unit
Operation
Unit
E1
lightningsurge
absorber
FG
FP Unit
E2
FP Unit
Input/Output
Unit
Main
Power
FP
Power
Input/Output
Power
Motor
Input/Output
Power
Twisted-pair cord
Constant
Voltage
Transformer
Insulating
Transformer
Twisted-pair cord
FP Unit
FP Unit
FG
FG