Chapter 5 Wiring
Solving noise problem
5-14
5 Solving noise problem
The wiring between PLC and external device will result in external noise affecting PLC system.
Here is the noise immunity resolution for different application.
Grounding
PLC should be separately grounded. Particularly, it should not be grounded together with other
heavy load (including inverter or motor).
TP03
Ot h e r machi ne
Apply Class 3 ground for TP03. The grounding wire should be 2mm
2
or more and less than 5 meters
in length.
TP03
ground
less than 5m
Inverter
ground
Motor (heavy load)
If the system can not be grounded separately, just connect the terminal of TP03 to the
distributing box as shown in figure. The connecting wire should be as short as possible. If the
distributing box has been grounded, it is not necessary to connect the grounding terminal of TP03 to
the distributing box.
If TP03 is installed on the door side of distributing box, please wire the grounding as shown in
following figure. (Apply grounding wire with diameter exceeding 2mm
2
and length within 50cm).
The door is grounded
to the control box
TP03 grounded to door
TP03
5.1 Power source noise
The noise immunity of TP03 power module is 1000Vp_p. when the noise is larger than that, please
add isolated transformer at power side to absorb high frequency noise (100KHZ~2MHZ).
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