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Chapter 6 Control Modes of Operation|ASDA-B Series
Revision January, 2009 6-33
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.
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 6.H. We ignore the dissipative power of IGBT 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.
Servo Drive
(kW)
Servo Motor (kW)
(Frame Size)
Rotor Inertia
J (kg. m
2
)
Regenerative power from
empty load 3000rpm to stop
Eo (joule)
Max. regenerative
power of capacitance
Ec (joule)
0.1 0.1 0.037 E-4 0.179 3.11
0.2 0.2 0.169 E-4 0.818 4.5
0.3 8.17 E-4 39.5
0.4 (60 mm) 0.277 E-4 1.34
0.4 ( 80 mm) 0.68 E-4 3.29
6.22
0.4
0.5 8.17 E-4 39.5
0.6 8.41 E-4 40.7
0.75
0.75 1.13 E-4 5.47
11.07
0.9 11.18 E-4 54.1
1 (100 mm) 2.578 E-4 12.5
1.0
1 (130 mm) 8.41 E-4 40.7
13.5
1.5 1.5 11.18 E-4 54.1 18.18
2 (100 mm) 4.239 E-4 20.5
2 (130 mm) 14.59 E-4 70.6
2.0
2 (180 mm) 34.68 E-4 168
22.5
Table 6.I
Eo= J * wr
2
/182 (joule) , wr : rpm