59
(c) Insulation transformer
An isolation transformer has an effect on reducing conducted
noise (especially, lightning surge).
Lightning surge may cause a malfunction of the programmable
controller.
As measures against lightning surge noise, connect an
isolation transformer as shown below.
Using an isolation transformer will reduce an impact of
lightning.
4.2
Measures to Comply with the Low Voltage Directive
The Low Voltage Directive requires each device that operates with the
power supply ranging from 50 to 1000VAC and 75 to 1500VDC to
satisfy the safety requirements.
This section summarizes precautions on using the MELSEC-L series
modules to comply with the Low Voltage Directive. These descriptions
are based on the requirements and standards of the regulation;
however, it does not guarantee that the entire machinery manufactured
based on the descriptions complies with the Low Voltage Directive. The
method and judgment for the Low Voltage Directive must be left at
manufacturer's own discretion.
(1) Standard applied to MELSEC-L series modules
• EN61010-1 Safety of equipment used in measurements,
controls, or laboratories.
The MELSEC-L series modules with a rated voltage of 50VAC and
75VDC or higher have been also developed to conform to the
above standard.
The modules which operate at the rated voltage of less than
50VAC and 75VDC are out of the Low Voltage Directive application
range.
100V AC
200V AC
T1
Isolation
transformer
Programmable
controller
power supply
I/O power
supply
Motor power
supply
I/O equipment
Motor equipment
Main
power
supply
Relay
terminal
block
Inside the control panel
Programmable
controller
Summary of Contents for 13J240
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