Noise Countermeasures - Epson RC520 Manual

Setup & Operation 3.4 Noise Countermeasures (Installation)

3.4 Noise Countermeasures

To minimize electrical noise conditions, the following items must be observed in the
system's cable wiring:
· The earth wire of the power supply should be grounded. (Ground resistance: 100Ω or
· Do not tap power from a power line that connects to any equipment which may cause
· When you tap power for the controller and the single-phase AC motor from the same
· Use a twisted pair motor power line.
· Do not run AC power lines and DC power lines in the same wiring duct, and separate
· For I/O lines, wire as short as possible and use a shielded cable and clamp the shield
· Use a shielded cable for the EMERGENCY connector and clamp the shield to the
· Make sure that the induction elements used to connect to the Controller's I/O (such as
40
less)
It is important to ground the frame of Drive Unit not only for prevention from electric
shock, but also for reducing the influence of electric noise around the Drive Unit.
Therefore, be sure to connect the earth wire (yellow/green) of the Drive Unit's power
cable to the ground terminal of the factory power supply. For details about the plug
and AC power cable, refer to the Setup & Operation 3.2.2 Power Plug.
noise.
power line, change the phase of one or the other. Ensure that they will not be the
same phase.
them by at least 200 mm. For example, separate the AC motor power line and the
controller power line by at least 200 mm from the sensor or valve I/O lines; and do not
bundle both sets of wiring with the same cable tie. If more than one duct/cable must
cross each other, they should cross perpendicularly.
shown below:
AC Line duct
DC line duct
to the attached D-I/O connector interior.
interior of the connector.
relays and solenoid valves) have surge suppressors. If an induction element without
surge suppressor has be used, make sure to connect a rectifying diode right in front of
the induction element. In selecting a rectifying diode, make sure that it can handle
the voltage and current incurred by the induction load.
200 mm or more
The preferable example is
RC520 Rev.7