20
Rev. 2 – 10
th
November2015
Driver Overheating: DERATING
When the temperature of the Driver components overtake a fixed threshold of 75°C the Driver
automatically reduces the performance in order to decrease the heating.
If it is not possible to reach a steady thermal equilibrium, the Driver shuts down.
The protection acts limiting the current to the motor .
Motor Overheating: THERMAL PROTECTOR
The motor is protected through a Thermal Protector.
If the motor temperature is too high the thermal protector open one phase and the Driver recognize the
error and it stops the fan (see the Alarm Handling chapter).
The Motor Winding temperature and the Driver derating are dependent on the fan size
and on the fan working point.
Therefore it is possible that the fan could work at 50°C without a performance limitation
Fig.26 – DDMP thermal behavior – Example DDMP 7/9
The Driver and motor areas rated for operating in a temperature range between -20°C
and +40°C.
The derating is tested and guaranteed from +40°C to +50°C .
Higher temperatures could damage the motor winding or the performance could be
strongly reduced.
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