2 Installation and Wiring
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52
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4 DC bus terminals (
+
), (-)
■
Terminals (+) and (-) of the DC bus have residual voltage after the controller is
VDC before performing wiring. Failure to comply may result in electric shock.
■
When connecting external braking components for the controller of 37 kW and
above, never reverse (+) and (-). Failure to comply may result in damage to the
■
The cable length of the braking unit must not exceed 10 m. Use the twisted pair wire
or tight pair wires for parallel connection.
■
Do not connect the regen. resistor directly to the DC bus. Otherwise, it may damage
5 Terminals (+), PB for connecting regen. resistor
■
These terminals are valid only for the models below 37 kW that have the built-in
braking unit.
■
Connect a regen. resistor of the recommended model, and ensure that the cable
length of the regen. resistor is shorter than 5 m. Otherwise, it may damage the
controller.
6 Controller output terminals U, V, W
■
with the local safety regulations and related IEC standards.
■
Use copper conductors of a proper size as power cables according to the
recommended values in
Table 3-2
.
■
Do not connect a capacitor or surge absorber to the output side of the controller.
Otherwise, it may cause overheating or even damage to the controller due to higher
harmonics in the controller output.
■
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 higher leakage current, causing the controller to trip in overcurrent
protection. If the motor cable is greater than 100 m long, an AC output reactor must
be installed close to the controller.
■
Use the shielded cable as the output power cables, with the shield connected to the
grounding cable.
■
The lead-out cable by the shield must be as short as possible, with the width not
smaller than 1/5 of the length.
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