Chapter 6 Control Modes of Operation|ASDA-A&A+ Series
6-40 Revision April 2009
External Regenerative Resistor
When using external regenerative resistor, connect it to P and C, and make sure the circuit between P
and D is open. We recommend the users should use the external regenerative resistor that the
resistance value following the above table (Built-in Regenerative Resistor Specifications). We ignore the
dissipative power of IGBT (Insulated Gate Bipolar Transistor) in order to let the users easily calculate
the capacity of regenerative resistor. In the following sections, we will describe Regenerative Power
Calculation Method and Simple Calculation Method for calculating the regenerative power capacity of
external regenerative resistors.
Regenerative Power Calculation Method
(1) Without Load
When there is no external load torque, if the servo motor repeats operation, the returned regenerative
power generated when braking will transmitted into the capacitance of DC bus. After the capacitance
voltage exceeds some high value, regenerative resistor can dissipate the remained regenerative power.
Use the table and procedure described below to calculate the regenerative power.
ASDA-A Series
Servo Drive (kW)
Rotor Inertia
J (kg. m
2
)
Regenerative power from empty
load 3000r/min to stop Eo (joule)
Max. regenerative power
of capacitance Ec (joule)
0.1 0.03E-4 0.15 3
0.2 0.18E-4 0.89 4
0.4 0.34E-4 1.68 8
0.75 1.08E-4 5.34 14
1.0 2.60E-4 12.86 18
1.5 3.60E-4 17.80 18
2.0 4.70E-4 23.24 21
Low Inertia
3.0 11.6E-4 57.36 28
1.0 5.98E-4 29.57 18
1.5 8.79E-4 43.47 18
2.0 15.8E-4 78.13 21
Medium
Inertia
3.0 43.3E-4 214.1 28
ASDA-A+ Series
Servo Drive (kW)
Rotor Inertia
J (kg. m
2
)
Regenerative power from empty
load 3000r/min to stop Eo (joule)
Max. regenerative power
of capacitance Ec (joule)
3 54.95 271.73 25
3.5 54.80 270.98 25
4.5
4.5 77.75 384.47 25
Eo = J x wr
2
/182 (joule) , Wr : r/min
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