The Inverter power limit is designed to ensure that the Inverter does not operate over the
components specification limit, minimizing reliability stress. When the input power reaches
the power limit, the Inverter software reduces the motor speed to reduce the input power
down to the limits of Table 2. Once input power drops under the power limit, the motor
speed increases again to the set speed. Figure 30 presents an example of the power limit
operation during a pull-down with a high load.
Figure 30 – Example of power limit operation during a Pull Down with high load
4.4.3. Thermal protection
The thermal protection is designed to ensure that the Inverter does not operate at too high
temperatures, minimizing reliability stress. When the Inverter reaches the temperature
limitation (measured with an NTC in the board), the Inverter software will reduce the motor
speed to reduce the input power and restrain the Inverter temperature increase. Once the
NTC temperature drops under the temperature limitation, the motor speed is increased again
up to the set speed (Figure 31).
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