Mitsubishi Electric MELSERVO-J5 User Manual page 206

1.
Calculate the running power and regenerative power from the servo motor speed and torque with the following formulas.
• For rotary servo motors
Running power and regenerative power [W] = Servo motor speed [r/min] × Torque [N•m]/9.55
• For linear servo motors
Running power and regenerative power [W] = Servo motor speed [m/s] × Thrust [N]
(Running power is indicated by positive values, and regenerative power is indicted by negative values.)
2.
Calculate the total output power of the servo motors from the running power and regenerative power of each servo
motor.
Running
power
MR-J5-500G/
HK-ST-502W
Regenerative
power
Running
power
MR-J5-350G/
HK-ST-352W
Regenerative
power
Running
power
MR-J5-700G/
HK-ST-702W
Regenerative
power
Running
power
MR-J5-700G/
HK-ST-702W
Regenerative
power
Running
power
Total output power
of the servo motors
Regenerative
power
3.
Select a multifunction regeneration converter based on the selection conditions.
• Servo amplifier units: 4 ≤ 10
Number of servo amplifiers OK.
• Total servo amplifier capacity [kW] = 5 kW + 3.5 kW + 7 kW + 7 kW = 22.5 kW
FR-XC-30K or more
• The effective value of the total servo motor output power [kW]
(20 × 0.1 + 5 × 0.2 + 20
= 2 2
FR-XC-30K or more
• Maximum value of the total servo motor output power [kW] = 40 kW
FR-XC-30K or more
Therefore, the multifunction regeneration converter selected should be the "FR-XC-30K".
6 OPTIONS AND PERIPHERAL EQUIPMENT
204
6.4 Multifunction regeneration converter (FR-XC-(H))
10 kW
0.1 s 0.1 s
-5 kW 0.1 s
10 kW
0.1 s 0.1 s
-5 kW 0.1 s
15 kW
0.2 s 0.1 s
0.1 s
-15 kW
0.3 s
20 kW
5 kW
0.1 s 0.1 s
× 0.5 + 40 × 0.1 + 5 × 0.1 + (-15)
2 2 2
0.6 s
0.6 s
0.6 s
20 kW
0.7 s
Add up all the servo motor outputs
20 kW
0.5 s
0.2 s
1.2 s per cycle
× 0.1)/1.2 = 18.93 kW
2
10 kW
0.1 s 0.1 s
-5 kW 0.1 s
10 kW
0.1 s
0.1 s
-5 kW 0.1 s
15 kW
0.1 s
0.1 s
-15 kW
0.2 s
40 kW
5 kW
0.1 s
0.1 s
0.1 s
-15 kW