Appendix 2-2 Selecting The Regenerative Resistor; Appendix 2-2-1 Calculating The Regenerative Energy - Mitsubishi Electric MELDAS MDS-R Series Technical Specification 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
E = 5.48×10
R
(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.
According to expression (2-6), the regenerative energy E
E = 5.48×10
R
Drive unit
MDS-R-V1-20
MDS-R-V1-40
MDS-R-V1-60
MDS-R-V1-80
POINT
Appendix 2. Selection
= 0).
R
-7 2
η (J +J ) N –Ec
• • •
L M
-7
×0.85×(6.1+6.1)×3000
Table 2-3 Drive unit charging energy
Charging energy Ec (J)
13
20
30
46
Table 2-4 Servomotor reverse efficiency
Servomotor
HF44
HF74
HF53
HF103
HF153
HF203
HF353
The charging energy values apply when the unit input power voltage is 220V. If
the input voltage is higher, the charging energy decreases, and the regenerative
energy increases.
consumed by the regenerative resistor can be
R
value is negative, all of the regenerative energy is
R
(J)
η : 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
MDS-R-V2-2020
MDS-R-V2-4020
MDS-R-V2-4040
MDS-R-V2-6040
MDS-R-V2-6060
MDS-R-V2-8040
MDS-R-V2-8060
MDS-R-V2-8080
Motor reverse efficiency η
0.85
0.85
0.85
0.85
0.85
0.85
0.85
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