Mechanical and Electrical Installation MD280/MD280N User Manual
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Terminals Name Description
RǃSǃT
Three-phase power input
terminal
Connect to the AC three-phase 380V power supply
(+)ǃ(-)
Negative and positive
terminals of DC bus
Shared DC bus intput point (Connect to the external
brake unit above 37G/45P)
(+)ǃPB
Connecting terminal for
brake resistor
Connection points for the brake unit of of below 37G/45P
Pǃ(+)
Connecting terminal for
external reactor
Connect to the external reactor
UǃVǃW
Output terminal of
inverter
Connect to three-phase motor
Grounding terminal
Grounding terminal
1˅ Wiring Precautions
a˅ Input power supply terminals L1, L2, R, S or T:
There is no sequence requirement for the wiring at the Input side of the
inverter.
b˅ DC bus (+) and (-) terminals:
The DC bus (+) and (-) terminals still have residual voltage at the time of
power-off. Do not touch the equipment until the charge LED is OFF and the
voltage measured with multimeter is less than 36V.
When selecting external brake components for the inverter of above 45kW,
note that the connecting polarity must be correct, or the inverter may be
damaged and even fire accident may occur.
The wire length of the brake unit shall not be longer than 10 meters. Twisted
wires or pair wires shall be used and connected in parallel.
Do not connect the braking resistor directly to the DC bus, otherwise, the
inverter may be damaged, and fire may be caused.
c˅ Connecting terminals (+) and PB of brake resistor
The connecting terminals of the brake resistor are enabled only for the
inverter of below 37G/45P with built-in brake unit.
The recommended wiring distance for the brake resistor shall be less than
5m. Otherwise, the inverter may be damaged.
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