Mitsubishi Electric MR-JE-_A Instruction Manual page 279

11. OPTIONS AND PERIPHERAL EQUIPMENT
(2) Losses of servo motor and servo amplifier in regenerative mode
The following table lists the efficiencies and other data of the servo motor and servo amplifier in the
regenerative mode.
Inverse efficiency (η
Capacitor charging (Ec): Energy charged into the electrolytic capacitor in the servo amplifier
Subtract the capacitor charging from the result of multiplying the sum total of regenerative energies
by the inverse efficiency to calculate the energy consumed by the regenerative option.
ER [J] = η
• Es - Ec
m
Select a necessary regenerative option by calculating the power consumption of the regenerative
option on the basis of one-cycle operation period tf [s].
PR [W] = ER/tf
11.2.3 Parameter setting
Set [Pr. PA02] according to the option to be used.
Inverse
Servo amplifier
efficiency [%]
MR-JE-10A 55
MR-JE-20A 75
MR-JE-40A 85
MR-JE-70A 85
): Efficiency including some efficiencies of the servo motor and servo amplifier
m
when rated (regenerative) torque is generated at rated speed. Efficiency
varies with the speed and generated torque. Since the characteristics of the
electrolytic capacitor change with time, allow for approximately 10% higher
inverse efficiency.
[Pr. PA02]
0 0
Regenerative option selection
00: Regenerative option is not used.
02: MR-RB032
03: MR-RB12
04: MR-RB32
05: MR-RB30
06: MR-RB50 (Cooling fan is required)
Capacitor
Servo amplifier
charging [J]
11 MR-JE-100A
11 MR-JE-200A
14 MR-JE-300A
25
For servo amplifier of 200 W or less, regenerative resistor is not used.
For servo amplifier of 0.4 kW to 3 kW, built-in regenerative resistor is used.
11 - 6
Inverse Capacitor
efficiency [%] charging [J]
85 25
85 42
85 42