Mitsubishi Electric MR-J4W2, Instruction Manual

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17. APPLICATION OF FUNCTIONS
17 - 52
(c) Calculation of immunity to instantaneous power failure
Table 17.7 shows immunity to instantaneous power failure when instantaneous power failure voltage
is "rated voltage × 50%" and instantaneous power failure time is 200 ms.
Table 17.7 immunity to instantaneous power failure (instantaneous power failure
voltage = rated voltage × 50%, instantaneous power failure time = 200 ms)
Servo amplifier model
Instantaneous
maximum output [W]
Tolerance against
instantaneous power
failure [W]
(voltage drop
between lines)
MR-J4W2-22B 1400 (700 × 2) 790
MR-J4W2-44B 2800 (1400 × 2) 1190
MR-J4W2-77B 5250 (2625 × 2) 2300
MR-J4W2-1010B 6000 (3000 × 2) 2400
MR-J4W3-222B 2100 (700 × 3) 970
MR-J4W3-444B 4200 (1400 × 3) 1700
Instantaneous maximum output means power which servo amplifier can output in maximum torque
at rated speed. You can examine margins to compare the values of following conditions and
instantaneous maximum output.
Even if driving at maximum torque with low speed in actual operation, the motor will not drive with
the maximum output. This can be handled as a margin.
The following shows the conditions of tolerance against instantaneous power failure.
1) Delta connection
For the 3-phase (L1/L2/L3) delta connection, an instantaneous power failure occurs in the voltage
between a pair of lines (e.g. between L1 and L2) among voltages between three pairs of lines
(between L1 and L2, L2 and L3, or L3 and L1).
2) Star connection
For the 3-phase (L1/L2/L3/neutral point N) star connection, an instantaneous power failure
occurs in the voltage between a pair of lines (e.g. between L1 and N) among voltages at six
locations, between three pairs of lines (between L1 and L2, L2 and L3, or L3 and L1) and
between one of the lines and the neutral point (between L1 and N, L2 and N, or L3 and N).