Protective Equipment - Siemens Sinamics S120 Function Manual

Figure 6-6
To carry out further checks, double-click on ".../Drives/Drive_1 > Configuration" in the
navigation list. A dialog opens allowing you to check the current configuration. The "Current
power unit operating values" button lists the Motor Modules according to component number.
During operation, they show the current electrical values.
Master/slave
Motor Modules connected in parallel can also be operated in master/slave mode. To do this,
use parameter p1330 to enter the input of the U/f characteristic for the next power unit. The
slaves only receive the voltage setpoint for the U/f characteristic.
6.11.4

Protective equipment

The protective functions are described in detail in the section "Thermal motor monitoring".
Additional protective devices include
● Ground fault
● Cable break
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Parallel connection of Motor Modules as braking module
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.
6.11 Motor Module as braking module
Basic functions
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