Issue A1 3 Commissioning
MICROMASTER 410 Operating Instructions
6SE6400-5EA00-0BP0 43
External motor thermal overload protection When operated below rated speed, the
cooling effect of fans fitted to the motor
shaft is reduced. Consequentially, most
motors require de-rating for continuous
operation at low frequencies. To ensure
that the motors are protected against
overheating under these conditions, a
PTC temperature sensor must be fitted to
the motor and connected to the inverter
control terminals as shown in Figure 3-8.
NOTE
To enable the trip function, set parameter P0701, P0702 or P0703 = 29.
1 k
Ω
Motor
PTC
4
5
1, 2
or 3
Inverter
Control
Terminals
Figure 3-8 Motor Overload PTC
Connection