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Chapter 6  Control Modes of Operation|ASDA-AB Series

 

6-36  

 

Revision January 2009

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When the output torque of servo motor in reverse direction of motor rotation speed, it indicates that 

there is a regenerative power returned from the load to the servo drive. This power will be transmitted 

into the capacitance of DC Bus and result in rising voltage. When the voltage has risen to some high 

voltage, the servo system need to dissipate the extra energy by using a regenerative resistor. ASDA-AB 

series servo drive provides a built-in regenerative resistor and the users also can connect to external 

regenerative resistor if more regenerative capacity is needed. 

The following table shows the specifications of the servo drive’s built-in regenerative resistor and the 

amount of regenerative power (average value) that it can process.  

Built-in Regenerative Resistor Specifications 

Servo Drive 

(kW) 

Resistance (Ohm) 

(parameter P1-52) 

Capacity (Watt) 

(parameter P1-53)

Regenerative Power 

processed by built-in 

regenerative resistor (Watt) *

1

 

Min. Allowable 

Resistance (Ohm)

0.1 40 

60 

30 

40 

0.2 40 

60 

30 

40 

0.4 40 

60 

30 

20 

0.75 40 

60 

30 

20 

1.0 40 

60 

30 

20 

1.5 40 

60 

30 

20 

2.0 20 

120 

60 

10 

When the regenerative power exceeds the processing capacity of the servo drive, install an external 

regenerative resistor. Please pay close attention on the following notes when using a regenerative 

resistor. 

1.  Make sure that the settings of resistance (parameter P1-52) and capacity (parameter P1-53) is set 

correctly. 

2.  When the users want to install an external regenerative resistor, ensure that its resistance value is 

the same as the resistance of built-in regenerative resistor. If combining multiple small-capacity 

regenerative resistors in parallel to increase the regenerative resistor capacity, make sure that the 

resistance value of the regenerative resistor should comply with the specifications listed in the 

above table. 

3.  In general, when the amount of regenerative power (average value) that can be processed is used 

at or below the rated load ratio, the resistance temperature will increase to 120°C or higher (on 

condition that when the regeneration continuously occurred). For safety reasons, forced air cooling 

is good way that can be used to reduce the temperature of the regenerative resistors. We also 

recommend the users to use the regenerative resistors with thermal switches. As for the load 

characteristics of the regenerative resistors, please check with the manufacturer.