7. SPECIAL ADJUSTMENT FUNCTIONS
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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)
Instantaneous maximum output means power which driver 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).
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