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Appendix 2. Selection
A2 - 5
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.
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
R
consumed by the regenerative resistor can be
calculated from expression (2-6). If the E
R
value is negative, all of the regenerative energy is
absorbed by the capacitor in the drive unit (capacitor regeneration), and the energy consumed by
the regenerative resistor is zero (E
the regenerative resistor is zero (E
R
= 0).
E
R
= 5.48
10
-7
(J
L
+J
M
)
N
2
–Ec
(J)
(2-6)
: Motor reverse efficiency
J
L
: Motor inertia
(kg
cm
2
)
J
M
: Load inertia
(kg
cm
2
)
N
: Motor speed
(r/min)
Ec
: Unit charging energy
(J)
(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
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
R
is:
E
R
= 5.48
10
-7
0.85(6.1+6.1)3000
2
–13 = 38.1 (J)
Table 2-3 Drive unit charging energy
Drive unit
Charging energy Ec (J)
Drive unit
Charging energy Ec (J)
MDS-R-V1-20 13
MDS-R-V2-2020
26
MDS-R-V1-40 20
MDS-R-V2-4020
30
MDS-R-V1-60 30
MDS-R-V2-4040
30
MDS-R-V1-80 46
MDS-R-V2-6040
46
MDS-R-V2-6060
46
MDS-R-V2-8040
66
MDS-R-V2-8060
66
MDS-R-V2-8080
66