35
DEVICE DATA OF THE 400 V DEVICES
Operation in the range of the thermal overload limit
Due to the high steepness of the overload characteristic, the duration of a permissible
overload in the range cannot be determined exactly. Therefore, the design of the drive
controller should be assumed to have a maximum overload time of 300s.
3.2.3.2 Frequency-dependent maximum current (OL2)
The characteristics of the maximum currents for a switching frequency which are de-
pendingontheoutputfrequencyaredierentforeachdrivecontroller,butthefollowing
rules are generally applicable:
• Applies for the rated switching frequency: at 0 Hz output frequency the drive control-
ler can provide at least the rated output current.
• Lower maximum currents apply for switching frequencies > rated switching frequency.
If error (OL2) shall be triggered on exceeding the maximum currents or if the switching
frequency is automatically reduced (derating) can be adjusted in the drive controller
parameters.
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