Wiring; Wiring Precautions - Mitsubishi Electric MELSEC-Q Series User Manual

4 PROCEDURES AND SETTINGS BEFORE SYSTEM OPERATION

4.4 Wiring

4.4.1 Wiring precautions

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This section describes wiring instructions and module connection examples.
External wiring must be noise-resistant as one of the conditions to fully exhibit the
Q62HLC functions and configure a highly reliably system.
The instructions given below should be followed in wiring.
(1) Use separate cables with the AC control circuit and the Q62HLC's external I/O
signals to avoid the influence of AC side surges and induction.
(2) Do not run the cables close to, or bundle them with, the main circuit and high-
voltage cables and the load cables from other than the programmable controller.
Always keep thermocouple/micro voltage signal line at least 100mm (3.94inch)
away from the main circuit cables and AC control circuit.
Fully keep them away from high-voltage cables and circuits which include higher
harmonics, e.g. inverter load's main circuit.
Failure to do so will make the cables susceptible to noise, surges and induction.
(3) Ground a shielded cable to the FG terminal of the programmable controller.
Note that it may be better to establish a ground on the external side depending on
the external noise conditions.
(4) To ensure that this product maintains EMC and Low Voltage Directives, refer to
"COMPLIANCE WITH EMC AND LOW VOLTAGE DIRECTIVES" in this manual
and carry out wiring.
MELSEC-Q
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