2-11
h
Main circuit power input terminals, L1/R, L2/S, and L3/T (for three-phase voltage input)
or L1/L and L2/N (for single-phase voltage input)
1) For safety, make sure that the molded case circuit breaker (MCCB) or magnetic contactor (MC) is
turned off before wiring the main circuit power input terminals.
2) Connect the main circuit power supply wires (L1/R, L2/S and L3/T or L1/L and L2/N) to the input
terminals of the inverter via an MCCB or residual-current-operated protective device (RCD)/earth
leakage circuit breaker (ELCB)*, and MC if necessary.
It is not necessary to align phases of the power supply wires and the input terminals of the inverter
with each other.
* With overcurrent protection
It is recommended that a magnetic contactor be inserted which can be manually activated.
This is to allow you to disconnect the inverter from the power supply in an emergency (e.g.,
when the protective function is activated) so as to prevent a failure or accident from causing
the secondary problems.
2.3.6 Wiring for control circuit terminals
In general, sheaths and covers of the control signal cables and wires are not specifically de-
signed to withstand a high electric field (i.e., reinforced insulation is not applied). Therefore, if a
control signal cable or wire comes into direct contact with a live conductor of the main circuit, the
insulation of the sheath or the cover might break down, which would expose the signal wire to a
high voltage of the main circuit. Make sure that the control signal cables and wires will not come
into contact with live conductors of the main circuit.
Failure to observe these precautions could cause electric shock and/or an accident.
Noise may be emitted from the inverter, motor and wires.
Implement appropriate measure to prevent the nearby sensors and devices from malfunctioning
due to such noise.
An accident could occur.
Table 2.8 lists the symbols, names and functions of the control circuit terminals. The wiring to the
control circuit terminals differs depending upon the setting of the function codes, which reflects the
use of the inverter.
Put back the main circuit terminal block cover and then connect wires to the control circuit terminals.
Route these wires correctly to reduce the influence of noise.
