Figure 3-8 Motor Overload Ptc Connection - Siemens micromaster 410 Operating Instructions Manual

Issue 04/02
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.
MICROMASTER 410 Operating Instructions
6SE6400-5EA00-0BP0
3 Commissioning
4
Motor
PTC
1, 2
or 3
1 kΩ
5
Figure 3-8 Motor Overload PTC
Connection
Inverter
Control
Terminals
43