13
“Power+” +0500120IE - rel 1.1 - 02.05.2017
ENG
Power supply
Connect the power supply cables to terminal block L, N and PE; for the size of the cables and type of the fuses, see
the table in paragraph 5.1. It is recommended to use a ferrite cable core (e.g. Fair-Rite 2631102002) rounding L and
N wires.
Important:
•
do not connect the power supply to terminals U, V, W;
•
make sure the voltage, frequency and number of phases in the power supply match the ratings of the specific
model.
Earth leakage current
The drive is designed to produce the minimum possible leakage current, however the leakage current depends on
the length and the type of motor cable, the effective switching frequency, the type of earth connection used and the
type of RFI filter installed, so earth leakage current greater than 3,5mA may occur.
Important:
•
When earth leakage current is greater than 3,5mA the protective conductor should be at least 10mm
2
if copper
or 16mm
2
if aluminium. As an alternative an additional protective conductor could be used;
•
in case of fault a leakage current with a DC component could occur.
Motor
Connect the motor power cable to the terminals U, V, W : use four-wire cable, the impedance of the earth wire must
be less than or equal to the impedance of the phase wires. For the size and maximum length of the cable, see the
table in paragraph 5.1. To ensure conformity to the EMC directive, use shielded cable with tape + braid shields (SN/
ST). The cable can also be laid in steel and copper cableways.
U
V
W
PE
MOTOR CABLE
Schermo treccia
Braid shield
Schermo nastro
Tape shield
Fig. 3.j
Earth the shield with a 360° metal clamp on both ends of the cable, as close as possible to the terminals. In case of
connection of the shield to the drive earth terminal PE (not recommended), the shield has to be twisted. The twisted
part must be left as short as possible, and the length must not exceed five times the width. Earth the motor directly
using the drive earth terminal PE. It is recommended to use a ferrite cable core (e.g. Fair-Rite 2631102002) rounding
U, V, W wires only, not PE wire.
