3 Electrical Installation
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■
Connect a braking resistor of the recommended model, and ensure that the cable
length of the braking resistor is shorter than 5 m. Failure to comply may result in
damage to the AC drive.
■
Note that no combustibles shall exist around the braking resistor. Avoid igniting the
surrounding components due to overtemperature of the braking resistor.
■
By default, the braking voltage is 700 V for AC drives of 90 kW and below which are
equipped with internal braking units.
6) AC drive output terminals (U, V, W)
(SPVOEJOHDMBNQ
GPSTIJFME
.BJODJSDVJUDBCMFT
UFSNJOBUFUIFTIJFME
BCPWFUIFDMBNQ
4IJFMEHSPVOEFE
Figure 3-20 Shield connection
■
The specications and installation method of external main circuit cables must
comply with local regulations and related IEC requirements.
■
Use copper conductors of a proper size as main circuit cables according to the
recommended values of power cable selection in
"6.2 Selection of Cables, Circuit
Breakers, and Contactors"
.
■
Do not connect a capacitor or surge protection device to the output side of the
AC drive. Otherwise, frequent AC drive faults and damage to the AC drive will be
caused.
■
If the motor cable is too long, electrical resonance will be generated due to
the impact of distributed capacitance. This will damage the motor insulation
or generate high leakage current, causing the AC drive to trip in overcurrent
protection. If the motor cable is longer than 100 m, an AC output reactor must be
installed close to the AC drive.
■
The shielding cables are recommended for the motor. The shielding layer must be
wound onto the cable support bracket. The drain wire must be grounded to the
grounding (PE) terminal.
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