NE200/300 Series Drive User Manual
26 Chapter 3 Wiring of Drive
3.2 Description of Peripheral Devices for Main Circuit
Circuit breaker
The capacity of the circuit breaker shall be 1.5 ~ 2 time of the rated current of
the drive. The time features of the circuit breaker shall fully consider the time
features of the drive overload protection.
Leakage circuit
breaker
Because the drive output is the high-frequency pulse voltage, there will be
high-frequency leakage current. Specialized leakage circuit breaker shall be
installed at the input end of the drive. B type leakage circuit breaker is
suggested, and the leakage current value shall be set as 300mA.
Contactor
Frequent open and close of contactor will cause drive failure, so the highest
frequency for the open and close of contactor shall not exceed 10 times/min.
When braking resistor is used, to protect the braking resistor from over-heat
damage, thermal protection relay shall be installed to control the disconnect of
the contactor at power supply side
or DC reactor
1. The drive power supply capacity shall be more than 600kVA or 10 times of
the drive capacity.
2. If there is switch type reactive-power compensation capacitor or load with
silicon control at the same power line, there will be high peak current flowing
into drive power input circuit, causing the damage of the rectifier components.
3. When the voltage unbalance of the three-phase power supply exceeds 3%,
the rectifier component will be damaged.
4. The input power factor of the drive is required to be higher than 90%.
In case of above situations, install the AC reactor at the input end of the drive or
DC reactor to the DC reactor terminal.
Input noise filter
The input noise filter can reduce the noise that flows from the power supply to
the drive or the drive to power supply.
Thermal
protection
relay
Although the drive has motor overload protection function, when one drive
drives two or more motors or multi-pole motors, to prevent the motor over
temperature failure, thermal protection relay shall be installed between the drive
and each motor, and the motor overload protection parameter FC.00 shall be
set as “0” (motor protection disabled).
Output noise filter
When the noise filter is applied to the output side of drive, the conduction and
radiation interference can be reduced.
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