Control circuit
46
INSTALLATION AND WIRING
2.6.4 Wiring precautions
• It is recommended to use a cable of 0.3 to 0.75 mm
2
for the connection to the control circuit terminals.
• The wiring length should be 30 m (200 m for terminal FM) at the maximum.
• Use two or more parallel micro-signal contacts or twin contacts to prevent contact
faults when using contact inputs since the control circuit input signals are micro-
currents.
• To suppress EMI, use shielded or twisted cables for the control circuit terminals
and run them away from the main and power circuits (including the 200 V relay
sequence circuit). For the cables connected to the control circuit terminals, connect their shields to the common terminal of
the connected control circuit terminal. When connecting an external power supply to terminal PC, however, connect the
shield of the power supply cable to the negative side of the external power supply. Do not directly earth (ground) the shield
to the enclosure, etc.
• Always apply a voltage to the fault output terminals (A1, B1, C1, A2, B2, C2) via a relay coil, lamp, etc.
• When a relay coil is connected to the output terminals, use one with a surge absorbing function (reflux diode). When the
voltage application direction is incorrect, the inverter will be damaged. Pay attention to the diode direction or other
precautions to avoid incorrect wiring.
Micro signal contacts Twin contacts
RUN
SE
Power
24 or 12 VDC
Inverter
RA
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