Selection Of Regenerative Resistor - Delta ASDA-M Series User Manual

Chapter 2 Installation

2.7 Selection of Regenerative Resistor

When the direction of pull-out torque is different from the rotation, it means the electricity is
sent back to the servo drive from the load-end. It becomes the capacitance of DC Bus and
increases the voltage. When the voltage increases to a specific value, the come-back
eletricity can only be consumed by regenerative resistor. There is a built-in regenerative
resistor in the servo drive. Users can also use the external regenerative resistor if needed.
The following table is the specification of built-in regenerative resistor provided by ASDA-M
series.
Servo Drive
Resistance
(kW)
(P1-52) (Ohm)
0.75
1.5
1
* The capacity of built-in regenerative resistor (average value) is 50% of the rated capacity
of the built-in regenerative resistor. The capacity of the external regenerative resistor is
the same as the built-in one.
When the regenerative resistor exceeds the capacity of built-in regenerative resistor, the
external regenerative resistor should be applied. Please pay special attention to the
followings when using the regenerative resistor.
1. Please correctly set up the resistance (P1-52) and capacity (P1-53) of the
regenerative resistor. Or it might influence the performance of this function.
2. If users desire to use the external regenerative resistor, please make sure the applied
value is the same as the built-in regenerative resistor. If users desire to connect it in
parallel to increase the power of regenerative resistor, please make sure the
capacitance meets the requirements.
3. In natural environment, if the capacity of regenerative resistor (the average value) is
within the rated capacity, the temperature of the capacitance will increase to 120℃ or
even higher (under the condition of regenerative energy keeps existing). For safety
concerns, please apply the method of forced cooling in order to reduce the
temperature of regenerative resistor. Or, it is suggested to use the regenerative
resistor which is equipped with thermal switches. Please contact the distributors for
load characteristics of the regenerative resistor.
2-8
Specification of built-in
regenerative resistor
Capacity
(P1-53) (Watt)
40 60
20 100
1
* The capacity of
built-in regenerative
resistor
(Watt)
30
50
ASDA-M
Minimum allowable
resistance
(Ohm)
30
20
Revision December, 2014