10 Service
210 Festo – GDCP-CMMS/D-FW-EN – 1404NH – English
10.1.6 I
2
t monitoring
The motor c ontroller has I
2
t monitoring to limit the average power loss in the output stage and in the
motor. As the power dissipation occurring in the power electronics and motor grows with the square of
the flowing current, the squared c urrent value is assumed as th e dimension of the power lo ss.
Note
I
2
t monitoring is designed for a uniform temperature increase of all motor phases. At
low speed (frequency) the individual phases of the motor are energised differently. This
can result in the permissible temperature being exc eeded in the energised phases.
– Avoid low speeds if the drive is to be operated at the load limit.
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