Appendix 2-2 Selecting The Regenerative Resistor; Appendix 2-2-1 Calculating The Regenerative Energy - Mitsubishi Electric MELDAS MDS-R Series Specifications And Instruction Manual

Appendix 2-2 Selecting the regenerative resistor

Calculate the regenerative energy for stopping (positioning) from each axis' rapid traverse rate, and
select a regenerative resistor having a capacity that satisfies the positioning frequency determined from
the machine specifications.

Appendix 2-2-1 Calculating the regenerative energy

(1) For horizontal axis
For the horizontal axis, the regenerative energy E
calculated from expression (2-6). If the E
absorbed by the capacitor in the drive unit (capacitor regeneration), and the energy consumed by
the regenerative resistor is zero (E
(Example)
When a load with the same inertia as the motor is connected to the HF53, determine the regenerative
energy to stop from the rated rotation speed. Note that the drive unit is MDS-R-V1-20 in this case.
A ccording to expression (2-6), the regenerative energy E
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= 5.48  10 -7 
 
E (J +J )
R L M
= 5.48  10  0.85  (6.1+6.1)  3000
-7
E
R
Table 2-3 Drive unit charging energy
Drive unit Charging energy Ec (J)
MDS-R-V1-20
MDS-R-V1-40
MDS-R-V1-60
MDS-R-V1-80
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Appendix 2. Selection
consumed by the regenerative resistor can be
R
value is negative, all of the regenerative energy is
R
= 0).
R
2
(J)

N –Ec

: Motor reverse efficiency
J : Motor inertia
L
J : Load inertia
M
N : Motor speed
Ec : Unit charging energy
is:
R
2
–13 = 38.1 (J)
Drive unit
13 MDS-R-V2-2020
20 MDS-R-V2-4020
30 MDS-R-V2-4040
46 MDS-R-V2-6040
MDS-R-V2-6060
MDS-R-V2-8040
MDS-R-V2-8060
MDS-R-V2-8080
A2 - 5
   (2-6)
2

(kg cm )
2

(kg cm )
(r/min)
(J)
Charging energy Ec (J)
26
30
30
46
46
66
66
66