4.2
Wiring of the Main Circuit
P
DANGER:
The frequency inverter must always be powered off completely before performing
any wiring work. Before starting rewiring or other work after performing operation
once, check the voltage with a meter etc. more than 10 minutes after power-off.
For some time after power-off, there is a dangerous voltage in the capacitor.
E
CAUTION:
The inverter must be grounded using the dedicated ground terminal.
Power must not be applied to the output terminals (U, V, W) of the inverter. Otherwise
the inverter will be damaged.
4.2.1
Mains, Motor and Ground Terminal Connections
The terminal blocks for connection of the frequency inverter can be accessed by removing the
front cover and the wire cover. Connect a 1-phase power supply to the terminals L1 and N when
using the inverter FR-S 520S EC/ECR and a 3-phase power supply to the terminals L1, L2 and
L3 when using the inverter FR-S 540 EC/ECR. The required power supply is 200–240V AC,
−
15% / +10% for the inverter type FR-S 520S EC/ECR and 380–480V AC,
−
15% / +10% for the
inverter type FR-S 540 EC/ECR. The main frequency is 50–60Hz ± 5% for all types.
Connect the motor cables to terminals U, V and W. The illustration below shows the correct as-
signments for the power connections. Please see the main frequency inverter manual for details
on the required cable dimensions for your model.
NOTE
The inverter must be grounded using the dedicated ground terminal.
14
MITSUBISHI ELECTRIC
Wiring
P1
-
+
PR
RUN
STR
FAN
2
FAN
1
FU
SD
Dedicated ground terminal
1-phase power supply
FR-E 520S EC
3-phase power supply
FR-E 540 EC
