Calculation Method Of Tolerance Against Instantaneous Power Failure - Mitsubishi Electric MELSERVO-J5 MR-J5 Series User Manual

Calculation method of tolerance against instantaneous power
failure
The following table shows the tolerance against instantaneous power failure when the instantaneous power failure voltage is
the rated voltage × 50 %, and the instantaneous power failure time is 200 ms.
Instantaneous maximum output means the power which the servo amplifier can output using maximum torque at the rated
speed. The margin can be examined by comparing the value of each condition with the instantaneous maximum output.
Even when the maximum torque is generated in actual operation, if the speed is low, the servo motor does not generate the
maximum output and the generated torque will instead be treated as a margin.
The following shows the conditions of tolerance against instantaneous power failure.
Delta connection
When the three phases (L1/L2/L3) are connected by delta connection, apply an instantaneous power failure to one of the
three pairs of line voltages (e.g. between L1 and L2).
Star connection
When the three phases (L1/L2/L3) are connected by star connection, from a total of six pairs of voltages, being (1) 3 pairs of
line voltages (between L1 and L2, L2 and L3, L3 and L1) and (2) 3 pairs of phases and a neutral point (between L1 and N, L2
and N, L3 and N), apply an instantaneous power failure to one pair of line voltages (e.g. between L1 and N).
Servo amplifier model
MR-J5-10_
MR-J5-20_
MR-J5-40_
MR-J5-60_
MR-J5-70_
MR-J5-100_
MR-J5-200_
MR-J5-350_
MR-J5-500_
MR-J5-700_
MR-J5W2-22G
MR-J5W2-44G
MR-J5W2-77G
MR-J5W2-1010G
MR-J5W3-222G
MR-J5W3-444G
Instantaneous maximum output [W]
350
700
1400
1800
3375
4000
6000
10500
15000
21000
1400 (700 × 2)
2800 (1400 × 2)
6750 (3375 × 2)
8000 (4000 × 2)
2100 (700 × 3)
4200 (1400 × 3)
Tolerance against instantaneous power
failure [W] (voltage drop between lines)
250
420
630
410
1150
1190
2040
2600
4100
5900
790
1190
2300
2400
970
1700
4 APPLICABLE FUNCTIONS
4.2 Compliance with SEMI-F47 standard
4
155