3 Electrical Installation
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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"
.
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The lter should be installed close to the input terminal of the AC drive. The
connection cable between them must be shorter than 30 cm. The grounding
terminals of the lter and AC drive must be connected. Ensure that the lter and AC
drive are installed on the same conductive mounting surface, which is connected
to the main grounding terminal of the cabinet.
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Figure 3-19 Installing the lter
4) DC busbar (+), (-)
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Note that residual voltage exists at the DC bus terminals (+) and (-) just after power-
o. After the CHARGE indicator goes o, wait at least 15 minutes before wiring.
Failure to comply may result in electric shock.
■
Note that (+) and (-) must be connected correctly when an external braking
component is used for AC drives of 90 kW and above. Failure to comply will cause
damage to the AC drive and braking component and even a re.
■
The cable length of the braking unit cannot be longer than 10 m. Use the twisted
pair wire or tight pair wires for parallel connection.
■
Do not connect the regenerative resistor directly to the DC bus. Failure to comply
may result in damage to the AC drive and even a re.
5) Terminals (+) and BR for connecting braking resistor
■
The terminals for connecting braking resistor are valid only for AC drives of 75 kW
and below which are equipped with internal braking units.
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