Mechanical and Electrical Installation MD380 User Manual
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Precautions on the Wiring
1) Power input terminals L1, L2 or R, S, T
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The cable connection on the input side of the AC drive has no phase sequence
requirement.
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The specication and installation method of external power cables must comply
with the local safety regulations and related IEC standards.
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Use copper conductors of a proper size as power cables according to the
recommended values in section 8.3.
2) DC bus terminals (+), (-)
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Terminals (+) and (-) of DC bus have residual voltage after the AC drive is
switched off. After indicator CHARGE goes off, wait at least 10 minutes before
touching the equipment Otherwise, you may get electric shock.
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When selecting external braking unit for the AC drive of 18.5 kW and above (220
V) and 37 kW and above (other voltage classes), do not reverse poles (+) and (-).
Otherwise, it may damage the AC drive and even cause a re.
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The cable length of the braking unit shall be no longer than 10 m. Use twisted pair
wire or pair wires for parallel connection.
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Do not connect the braking resistor directly to the DC bus. Otherwise, it may
damage the AC drive and even cause re.
3) Braking resistor connecting terminals (+), PB
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The connecting terminals of the braking resistor are effective only for the AC drive
of up to and including 30 kW, tted with the internal braking unit.
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The cable length of the braking resistor shall be less than 5 m. Otherwise, it may
damage the AC drive.
4) External reactor connecting terminals P, (+)
For the AC drive of 37 kW and above (220 V) and 75 kW and above (other voltage
classes), remove the jumper bar across terminals P and (+) and install the reactor
between the two terminals.
5) AC drive output terminals U, V, W
–
The specication and installation method of external power cables must comply
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 section 8.3.
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The capacitor or surge absorber cannot be connected to the output side of the
AC drive. Otherwise, it may cause frequent AC drive fault or even damage the AC
drive.
–
If the motor cable is too long, electrical resonance will be generated due to
the impact of distributed capacitance, thus damaging the motor insulation or
generating higher leakage current, causing the AC drive 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 AC drive.
6) Terminal PE
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This terminal must be reliably connected to the main earthing conductor. Otherwise,
it may cause electric shock, mal-function or even damage to the AC
drive.
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