RS Automation OEMax CSD7, User Manual, Page: 267 / 332

Application
9-15
CSD7 Servo Drive (EtherCAT)
Selection Criterion of Regenerative Resistor
Selection Criterion Using the allowable number of repetition
The regenerative resistor has to be selected with the specification that meets the load
system of the user. One of the selection standards may be the selection of optimal
regenerative resistor that satisfies the load system by calculating the frequency of repeated
motion of the motor.
The repeated frequency means the frequency of operation that the motor rotates and stops
regardless of the rotation direction of the motor. The permitted repetition frequency means
the maximum repetition frequency per minute.
The motor regenerative resistor selection by the repetitive frequency is limited to the
loading operated in the horizontal direction.
Refer to the below formula to calculate the maximum allowable repetition frequency of the
load system.
Allowable Number of Repetition
=
𝐴𝐴𝐴𝐿𝐴𝐿𝐴𝐴𝐼 𝐼𝑛𝑛𝐴𝐼𝐼 𝐿𝑜
𝐼𝐼𝑟𝐼𝐼𝐼𝐼𝐼𝐿𝐼 𝐼𝐼 𝐴𝐼𝐼ℎ𝐿𝑛𝐼 𝐴𝐿𝐿𝐿
1+𝐼
X (
𝑀𝐿𝑀 . 𝑆𝑟𝐼𝐼𝐿
𝑆𝐼𝐼𝐼𝐼𝐼𝑆 𝑆𝑟𝐼𝐼𝐿
) ²
[Cycles/Min]
•
Contents necessary in calculation shall be referred to the below.
•
‘n’ is the inertia ratio.
•
The maximum speed of motor shall be referred to the motor specifications.
Make sure to use the actual repetition Frequency of the
motor smaller than the permitted repetition frequency
calculated on the above formula.
CAUTION