Mitsubishi Electric MR-J4, Instruction Manual

Page: 321 / 794

7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 32
(3) Calculation of tolerance against instantaneous power failure
Table 7.3 shows tolerance against instantaneous power failure when instantaneous power failure
voltage is "rated voltage × 50%" and instantaneous power failure time is 200 ms.
Table 7.3 Tolerance against 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-J4-10A(-RJ) 350 250
MR-J4-20A(-RJ) 700 420
MR-J4-40A(-RJ) 1400 630
MR-J4-60A(-RJ) 2100 410
MR-J4-70A(-RJ) 2625 1150
MR-J4-100A(-RJ) 3000 1190
MR-J4-200A(-RJ) 5400 2040
MR-J4-350A(-RJ) 10500 2600
MR-J4-500A(-RJ) 15000 4100
MR-J4-700A(-RJ) 21000 5900
MR-J4-11KA(-RJ) 40000 2600
MR-J4-15KA(-RJ) 50000 3500
MR-J4-22KA(-RJ) 56000 4300
MR-J4-60A4(-RJ) 1900 190
MR-J4-100A4(-RJ) 3500 200
MR-J4-200A4(-RJ) 5400 350
MR-J4-350A4(-RJ) 10500 730
MR-J4-500A4(-RJ) 15000 890
MR-J4-700A4(-RJ) 21000 1500
MR-J4-11KA4(-RJ) 40000 2400
MR-J4-15KA4(-RJ) 50000 3200
MR-J4-22KA4(-RJ) 56000 4200
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.
(a) 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).
(b) 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).