Parker AC30 series, User Manual

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Parameter Reference
D-77
AC30 series Variable Speed Drive
reduced to a level that will still provide required torque, but not much more torque. This operation on the cusp of required torque is also the biggest
weakness of energy saving mode. Energy saving procedure does monitor torque demand and as soon as it detects its rise the drive switches from
energy saving mode to normal mode of operation. However, sudden increases in load may be too quick to be dealt with by energy saving mode,
and may lead to stall or trip conditions. This will occur if the time to correctly re-flux the motor takes longer than the time of load increase, when there
can be a window of time when the motor is simply not able to generate sufficient torque necessary for the new, increased load conditions. For this
reason the user has to be very careful when choosing to utilize energy saving mode.
Energy saving mode should ideally be used in applications where there are prolonged periods of low load operation, with no fast excursions towards
rated torque. The user always has to be certain that the overall load cycle for their application would still be correctly serviced if the energy saving
mode is enabled, and that energy saving mode is not being incorrectly used at the expence of required performance.