Protective Equipment - Siemens SINAMICS S120 Function Manual

Basic functions
6.12 Motor Module as a Braking Module
6.12.4

Protective equipment

The protection functions are explained in detail in Section Thermal monitoring and overload
responses (Page 530). Additional protective devices include:
● Ground fault
● Cable break
● Overcurrent
● Overtemperature of the resistors
Configuring temperature evaluation contacts
1. Switch the temperature evaluation contacts of all 3 resistors in series.
2. Connect the temperature evaluation contacts to the temperature sensor evaluation of the
3. Set parameter p0600 = 11 and p0601 = 4.
4. Parameterize the temperature sensor evaluation of the Motor Module as "external fault".
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Monitoring of sum of all phase currents.
An unbalanced load of 20% and more produces a non-symmetrical current, which is
detected by the I*T monitoring.
– Alarm A06921 is output if phase non-symmetry is detected.
– The errors are located in parameter r0949:
Parameter r0949 = 11 Wire break phase U
Parameter r0949 = 12 Wire break phase V
Parameter r0949 = 13 Wire break phase W
– Fault F06922 is output if phase failure is detected.
The Imax controller is active. The setpoint is stored in parameter p0067.
The temperature is monitored using bimetal temperature switches mounted on the
resistors.
Motor Module (terminals X41.3 and X41.4).
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions