Delta ASD-A2 Series User Manual page 44

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Chapter 2 Installation

(2) Simple Selection

Choose the appropriate regenerative resistor according to the allowable frequency and

empty load frequency in actual operation. The so-called empty allowable frequency is the

frequency of continuous operation when the servo motor runs from 0r/min to the rated speed

and then decelerates from the rated speed to 0r/min within the shortest time. The following

table lists the allowable frequency when the servo drive runs without load (times/min).

Allowable frequency when the servo motor runs without load (times/min)

Motor Capacity

When the servo motor runs with load, the allowable frequency will be different according to

different load inertia or speed. The following is the calculation method.

m represents load / motor inertia ratio.

Allow able fr equency =

The comparison table of external regenerative resistor is provided below. Please choose the

appropriate regenerative resistor according to the allowable frequency.

The table below describes the suggested allowable frequency (times/min) of regenerative

resistor when the servo drive runs without load.

Allowable frequency of regenerative resistor when the servo drive runs without load (times/min)

Corresponding Motor

BR400W040 (400W 40Ω)

BR1K0W020 (1kW 20Ω)

Revision February, 2017

and uses a built-in regenerative resistor

600W 750W 900W

Allowable frequency when serv o motor run w ithout load

Motor Capacity

Rated s peed

Operating speed

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