Protective Equipment - Siemens SINAMICS S120 Function Manual

Basic functions
7.12 Motor Module as a Braking Module
7.12.4

Protective equipment

The protection functions are explained in detail in Section Thermal monitoring and overload
responses (Page 548). Additional protective devices include:
● Ground fault
Monitoring of sum of all phase currents.
● Cable break
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:
– Fault F06922 is output if phase failure is detected.
● Overcurrent
The Imax controller is active. The setpoint is stored in parameter p0067.
● Overtemperature of the resistors
The temperature is monitored using bimetal temperature switches mounted on 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
Motor Module (terminals X41.3 and X41.4).
3. Set parameter p0600 = 11 and p0601 = 4.
4. Parameterize the temperature sensor evaluation of the Motor Module as "external fault".
318
Parameter r0949 = 11 Wire break phase U
Parameter r0949 = 12 Wire break phase V
Parameter r0949 = 13 Wire break phase W
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions