Electrical Design Guide
‑36‑
Note
If the cables of above 16AWG are required, contact the sales personnel of Inovance.
3.3 Control Cable Selection
3.3.1 Rules
Observe the following requirement during control circuit wiring:
● When connecting DO terminals to relays, ensure the polarity of the flywheel diode
is correct. Wrong polarity will result in equipment damage or signal output failure.
● Keep a distance of at least 30 cm between main circuit cables and I/O signal
cables/encoder cables. Otherwise equipment may malfunction due to disturbed I/
O signals.
● Use twisted pairs or multi‑conductor shielded twisted pairs as the I/O signal cable
or encoder cable. Failure to comply may result in equipment malfunction.
● The maximum wiring lengths of the I/O signal cable and the encoder cable are 3 m
and 10 m respectively.
3.3.2 Control Cable Types
I/O signals include DI/DO signals and relay output signals.
Observe the following requirement during control circuit wiring:
Route the control circuit cables and main circuit cables or other power cables through
different routes with a distance of at least 30 cm. Failure to comply may result in
disturbed I/O signals.
3.3.3 Control Cable Specifications
I/O signals include DI/DO signals and relay output signals.
3.3.4 Control Cable Shield
It is recommended to use shielded signal cables to prevent I/O signal circuit from
being disturbed by external noise. Use separate shielded cables for different analog
signals. It is recommended to use shielded twisted pairs for digital signals.
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