Connection Examples - Siemens S120 Manual

5.1.1.3

Connection examples

The braking resistor is connected directly on the Power Module at the terminals DCP/R1 and
R2.
The braking resistor must be protected against overheating. A thermostatic switch handles
this protective function (included in the scope of supply of each breaking resistor). Evaluate
the braking resistor temperature monitoring so that the motor is switched off when the
resistor is in an overtemperature condition. Two techniques to connect the thermostatic
switch are described in the following.
Connect the thermostatic switch to a Control Unit
Connect the thermostatic switch to a free digital input of the Control Unit. Set the function of
this digital input to the OFF2 command. If the braking resistor overheats, the Power Module
is disconnected from the power supply.
Figure 5-1
AC Drive
Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
Connecting the thermostatic switch on the braking resistor to a Control Unit
DC link components
5.1 Blocksize
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