User`s manual

6-4
(2) Countermeasure of noise from power supply line
The AC power supply input noise resistance capacity of the JW300 is 1000 Vp-p. When any noise
over this limit is possible to come through the power supply line, install an insulation transformer.
Countermeasure: Install an insulation transformer
Noise has a high frequency of 100 KHz to 2 MHz, which should be blocked by a
transformer.
Note: When using an insulation transformer, note the following points:
- An insulation transformer with static electricity shield can also prevent noise by static coupling.
- Install and insulation transformer near the power supply input of the control panel in order
to block noise at the entrance of the control panel.
- Use two twisted wires in the primary and secondary sides of the transformer.
- Choose the insulation transformer of the capacity of more than 20% higher than that of the
rated load. When a transformer of the same capacity as that of the rated load is used, a
primary input voltage might exceed the transformer rated capacity and become dangerous
state such as emitting smoke.
* Maximum load capacity when one power supply module is
used.
- When a large-capacity transformer with higher voltage in the secondary side is chosen, we
recommend to install a intermediate voltage tap.
- With particularly large noise, several transformers can be installed, not only to the power
supply input of the JW300 but also to the load and AC input.
PLC
AC inputAC power supply
Insulation transformer
AC power supply
Insulation transformer
Terminal block
Control panel
Twisting
PLC
Primary side
110V
100V
90V
0V
AC power supply
For PLC power supply
For load
For PLC input
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