E-19
8
Power Supply Cautions
Please pay special attention to the following instructions when connecting the
power plug to the PS-A unit.
•
If the power supply voltage exceeds the PS-A unit's specified range, connect a
voltage transformer.
•
Between the line and the ground, be sure to use a low noise power supply. If
there is still an excessive amount of noise, connect a noise reducing transformer.
Be sure any constant or insulating transformer used has a capacity of
200VA or more.
9
Grounding Cautions
•
When attaching a wire to the PS-A unit's rear face FG terminal, (on the Power
Input Terminal Block), be sure to create an exclusive ground.
*1
•
FG and SG terminals are internally connected in the PS-A. When connecting to
another device, be sure to create an SG shorting loop in your system.
•
Input and Output signal lines must be separated from the power control cables
for operational circuits.
•
To increase noise resistance, be sure to twist the ends of the power cord wires
before connecting them to the PS-A unit's power terminal block.
•
The PS-A unit's power supply cord should not be bundled with or kept close to
main circuit lines (high voltage, high current), or input/output signal lines.
•
Connect a surge absorber to handle power surges.
•
Ground the lightning surge absorber and the PS-A separately.
•
Select a lightning surge absorber which will not exceed the allowable
circuit voltage, even when the voltage rises to the maximum.
•
To reduce noise, make the power cord as short as possible.
10
Input/Output Signal Line Cautions
•
Input and Output signal lines must be separated from the power control cables
used for operational circuits.
•
If this is not possible, use a shielded cable and the shield should be grounded.
*1 Use a grounding resistance of 100
Ω
, a wire of 2mm
2
or thicker, or your country's
appli-
cable standard.
