1. The necessity of braking resistance
If the regenerative energy that occurs during deceleration and descent in the application is too large, there is a possibility that the voltage of the main circuit inside the inverter will rise, causing damage.
Since the inverter usually has a built-in overvoltage maintenance function, it will stop after detecting the overvoltage (OV) of the main circuit and will not cause damage. However, since the motor stops when an abnormality is detected, it is difficult to continue operation stably.
It is necessary to apply a brake resistor/brake resistor unit/brake unit to release the regenerative energy to the outside of the inverter.
(1) Regenerative energy
The load attached to the motor has kinetic energy when rotating and potential energy when it is in a high position. When the motor slows down, or the load is reduced, this energy is returned to the inverter. This phenomenon is called regeneration, and that energy is called regenerative energy.
(2) Avoidance of braking resistance
There are the following ways to avoid braking resistor connection. Since the avoidance method will inevitably add a deceleration time, please check that there is no problem even if the deceleration time is extended.
· When decelerating, the stall avoidance function is effective (it is set to useful in the setting at the time of shipment) (the deceleration time is automatically added to avoid the occurrence of overvoltage in the main circuit).
· Set the deceleration time longer. (Regeneration energy reduction per unit of tick).
· Select Free Spins Aborted. (Regenerative energy is not returned to the drive).
2. Brief selection of braking resistor
This is a method that is abbreviated according to the ratio of the moment when the regenerative energy occurs in the normal action mode. Calculate the usage rate according to the following action patterns.
(1) If the usage rate is 3% or less
Select a braking resistor. A list of braking resistors corresponding to the capacity of the inverter is listed in the instruction manual and product catalog ·. Please connect the appropriate braking resistor according to the inverter used. (If the capacity of the inverter becomes larger, a braking resistor can be installed on the cooling fan of the inverter).
(2) If the usage rate is 10% ED or less
Select a braking resistor. A list of brake resistors corresponding to the capacity of the inverter is listed in the instruction manual and product catalog ·, so please refer to the brake resistor unit corresponding to the inverter used.
3. Easy selection of braking resistor
If you need a very large braking torque if the braking resistor is more than 10% ED, calculate the regenerative energy according to the following selection method.
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