Mitsubishi Electric MELDAS MDS-B-SVJ2 Series - Selection of Regenerative Resistor; Calculation of Regenerative Energy

Chapter 11 Selection
11-12
11-4 Selection of regenerative resistor
To select the regenerative resistor, first the regenerative energy from when each axis stops (is
positioned) is calculated. A regenerative resistor having a capacity to satisfy the positioning frequency,
determined from the machine specifications, is selected.
11-4-1 Calculation of regenerative energy
(1) For horizontal axis
For the horizontal axis, the regenerative energy E
R consumed by the regenerative resistor can be
calculated with the expression (11-7). If the E
R value is negative, all of the regenerative energy is
absorbed (CONDENSER REGENERATION) by the capacitor on the amplifier, and the energy
consumption by the regenerative resistor is zero (E
R = 0).
E
R = 5.48 × 10
–7
· η · (JL + JM) · N
2
– Ec (J) .................................................. (11-7)
η : Motor reverse effect
J
L : Motor inertia (kg·cm
2
)
J
M : Load inertia (kg·cm
2
)
N : Motor speed (r/min)
Ec : Amplifier charging energy (J)
The regeneration energy is obtained for when the axis stops from the rated speed while a load with the
same inertia as the motor is connected to the HC52 motor.
Regeneration energy ER is calculated using expression (11-7) below.
ER = 5.48 × 10
−
7
× 0.85 × (6.6 + 6.6) × 2000
2
− 11 = 13.6 (J)
Table 11-8 (1) Amplifier charging energy
Amplifier capacity Charging energy Ec (J) Amplifier capacity Charging energy Ec (J)
MDS-B-SVJ2-01 9 MDS-B-SVJ2-07 20
MDS-B-SVJ2-03 9 MDS-B-SVJ2-10 40
MDS-B-SVJ2-04 9 MDS-B-SVJ2-20 40
MDS-B-SVJ2-06 11
Table 11-8 (2) Servomotor reverse effect
Servomotor
Motor
reverse
effect η
Servomotor
Motor
reverse
effect η
Servomotor
Motor
reverse
effect η
Servomotor
Motor
reverse
effect η
HC52 0.85 HA40N 0.85 HC-SF52 0.85 HA-FF053 0.35
HC102 0.85 HA80N 0.85 HC-SF102 0.85 HA-FF13 0.55
HC152 0.85 HA100N 0.85 HC-SF152 0.85 HA-FF23 0.70
HC202 0.85 HA200N 0.85 HC-SF202 0.85 HA-FF33 0.75
HC352 0.85 HC-SF352 0.85 HA-FF43 0.85
HC53 0.85 HA053N 0.55 HC-SF53 0.85 HA-FF63 0.85
HC103 0.85 HA13N 0.70 HC-SF103 0.85
HC153 0.85 HA23N 0.75 HC-SF153 0.85 HC-MF053 0.35
HC203 0.85 HA33N 0.75 HC-SF203 0.85 HC-MF13 0.55
HA43N 0.85 HC-SF353 0.85 HC-MF23 0.70
HC103R 0.85 HA83N 0.85 HC-MF43 0.85
HC153R 0.85 HA103N 0.85 HC-RF103 0.85 HC-MF73 0.85
HC203R 0.85 HC-RF153 0.85
HC-RF203 0.85
POINT
The regenerative energy is the value for when the amplifier input power voltage
is 220 V.
If the input voltage is higher than this, the charging energy will decrease and
the regeneration energy will increase.
Example