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Chapter 7 Peripheral Equipments
71
7.2 Function of Peripheral Equipment
Table 7-1 Function of Peripheral Equipment
Peripheral
Equipment &
Optional parts
Description
Breaker
It is used to cut off the fault current of the driver rapidly and
prevent the power fault caused by fault with the driver and its
circuits.
Contactor
It is used to cut off the main power supply at the time of driver
fault and prevent power failure & restarting after the fault
* AC Reactor
It is used to improve the input power factor, reduce the higher
harmonic and inhibit the power surge
*EMI Filter
It is used reduce the radio disturbance caused by the driver.
When the wiring distance between the motor and the driver is
less than 20m, it is suggested to be connected to the power
supply side; when the distance is over 20m, is suggested to be
connected at the output side.
* Braking Unit
and Braking
resistor
They are selected and used when the braking torque cannot meet
the requirements, and are applicable on occasions of high-inertia
load & frequent braking or rapid stop.
Remarks: *-marked items are optional parts.
7.2.1
AC Input Reactor
Using AC input reactor can restrain higher harmonic wave and improve power factor
obviously. In the following situation, users are advised to use ac reactor.
Power supply capacity: Driver capacity>10:1
Silicon controlled load and switching controlled power factor compensator are on
the same power supply line.
Degree of three-phase voltage imbalance is more than 3%
7.2.2 Braking Unit and Braking resistor
Brake units are in-built in this series of drivers whose power rating is 15kW and below.
When dynamic braking is required, the user just has to connect the braking resistor.
There are not in-built brake units with the drivers of 18kW and above. When the
dynamic braking is required, the additional braking unit should be connected. The
braking unit consists of the control part, the driving part and the discharging resistance.
The control part should be adjusted according to the overvoltage protection action
values for this series of drivers. If the discharging resistance part is provided with the
overheating protection, it is suggested that the controlling connection point be
connected to the main control circuit.
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