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2. DESIGN
2
−
11
(2) Power supply noise and lightening surge suppression techniques
If there is a possibility that a malfunction may occur due to a sneak noise from the
main power supply or servo amplifier or due to a lightening surge, use a line noise
filter and lightening surge absorber in the power supply lines of the motion controller
and I/O equipment. Also use an insulating transformer for suppression of common
noises of the power supplies (noises produced between power supplies and earth).
•
Example of using the line noise filter
Motion
controller I/O
equipment
E
2
AC
E
1
Line noise
filter
•
Example of a circuit using the lightening surge absorber
Motion
controller I/O
equipment
E
2
AC
E
1
Lightening surge absorbe
r
•
Example of using the insulating transformer
Motion
controller I/O
equipment
AC
TR
(3) Circuit designed for voltage fluctuation
If the voltage fluctuation of the main power supply is greater than the specified
value, use the constant-voltage transformer.
Constant-
voltage
transformer
CPU module
AC
CAUTION
Separate the grounding (E
1
) of the line noise filter and lightening surge absorber from the
grounding (E
2
) of the motion controller.
Choose the lightening surge absorber which will not cause the maximum permissible circuit
voltage of the power supply module to be exceeded when the power supply voltage rises to the
maximum.
When using the power transformer which will drop the voltage from 200VAC to 100VAC or the
insulating transformer, its capacity should be not lower than the value in the following table.
Power Supply Module Model Transformer Capacity
A1S61PN
A1S62PN
CPU module
110VA
110VA
110VA