Chapter 2 InstallationASDA-A2R Series
2-16 Revision December, 2014
(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
maximum frequency of continuous operation when the servo motor runs from 0m/s to 5m/s
and then from 5m/s to 0r/min. The following table lists the allowable frequency of built-in
regenerative resistor when the servo drive runs without load (times/min).
Motor Capacity
Corresponding
Motor
400 W 400 W 400 W 750 W 750 W 750 W
04 06 08 04 06 08
ECML-S25□□A2DNS 87 60 45 - - -
ECML-S32□□A2DNS - - - 96 65 51
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.
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)
Motor Capacity
Corresponding
Motor
ECML-S25
□□
A2DNS
400 W 400 W 400 W 750 W 750 W 750 W
04 06 08 04 06 08
BR400W040 (400 W 40Ω) 872 600 457 - - -
BR1K0W020 (1 kW 20Ω) - - - - - -
Motor Capacity
Corresponding
Motor
ECML-S32
□□
A2DNS
400 W 400 W 400 W 750 W 750 W 750 W
04 06 08 04 06 08
BR400W040 (400 W 40Ω) - - - 640 436 342
BR1K0W020 (1 kW 20Ω) - - - 1600 1090 855
If watt is not enough when using regenerative resistor, connecting the same
regenerative resistor in parallel can increase the power.
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