Fuji Electric FRENIC-AQUA series, User Manual

Page: 186 / 751

5.1 Mounting and Wiring the Inverter
5-7
Chap. 5
PR
EP
AR
A
T
IO
N AND
TEST
RUN
2) Connect the main circuit power supply wires (L1/R, L2/S and L3/T) to the input terminals of the
inverter via an MCCB or residual-current-operated protective device (RCD)/earth leakage circuit
breaker (ELCB)*, and an 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
• When wiring the main circuit power lines of the inverter of 11 to 37 kW, be sure to pass
them through a ferrite core.
• To drive the inverter with single-phase input power, consult your Fuji Electric
representative.
• It is recommended to insert a manually operable magnetic contactor (MC) that allows you
to disconnect the inverter from the power supply in an emergency (e.g., when the protective
function is activated), preventing a failure or accident from causing secondary disasters.
• When shielded wires are not used for the motor cable, remove the motor cable clamps to
prevent the cable covering from getting damaged, which makes the machinery or
equipment incompliant with the EMC standards. Wiring the inverter main power input
lines without passing them through a ferrite core also makes the machinery or equipment
incompliant with the EMC standards due to increase of noise generated by the inverter, but
it does not affect inverter basic operation.
Auxiliary control power input terminals R0 and T0
In general, the inverter runs normally without power supplied to the auxiliary control power input
terminals R0 and T0. If the inverter main power is shut down, however, no power is supplied to the
control circuit so that the inverter cannot issue a variety of output signals or display on the keypad.
To retain an alarm output signal
ALM issued on inverter's programmable output terminals by the
protective function or to keep the keypad alive even if the main power has shut down, connect the
auxiliary control power input terminals R0 and T0 to the power supply lines. If a magnetic contactor
(MC) is installed in the inverter's primary circuit, connect the primary circuit of the MC to these
terminals R0 and T0.
Terminal rating: 380 to 480 VAC, 50/60 Hz, Maximum current 0.5 A (400 V class series)
When introducing a residual-current-operated protective device (RCD)/earth leakage circuit
breaker (ELCB), connect its output (secondary) side to terminals R0 and T0. Connecting its
input (primary) side to those terminals causes the RCD/ELCB to malfunction since the input
power voltage to the inverter is three-phase but the one to terminals R0 and T0 is
single-phase. To avoid such problems, be sure to insert an insulation transformer or auxiliary
B contacts of a magnetic contactor in the location shown in Figure 5.4.
Figure 5.4 Connection Example of residual-current-operated protective device (RCD)/
Earth Leakage Circuit Breaker (ELCB)