Mitsubishi Electric MELSERVO-J3 Series Manual page 347

Part 5: Common Reference Material
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).
(9) Lost motion compensation function
The lost motion compensation function corrects response delays (caused by a non-sensitive band due
to friction, twist, expansion, and backlash) caused when the machine travel direction is reversed. This
function contributes to improvement for protrusions that occur at a quadrant change and streaks that
occur at a quadrant change during circular cutting.
This function is effective when a high follow-up performance is required such as drawing an arc with an
X-Y table.
POINT
The lost motion compensation function is enabled only in the position control
mode.
It is not available with MR-J4W2-_B servo amplifiers.
The locus before compensation
Compensation
Travel
direction
The locus after compensation
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