Simulation Mode (Vector) - Siemens SINAMICS S120 Function Manual

Extended functions

Simulation mode (vector)

4.10 Simulation mode (vector)
4.10.1 Description
The simulation function is predominantly used to simulate the drive without a motor
being connected and without a DC link voltage. In this case, it should be noted that
the simulation mode can only be activated under an actual DC link voltage of 40 V.
If the voltage lies above this threshold, the simulation mode is reset, and a fault
message F07826 is issued.
Simulation mode enables communication with a higher-level automation system to
be tested. If the drive is also to return actual values, then it must be ensured that
during simulation operation, sensorless operation (V/f) should be selected. This
means that large parts of the SINAMICS software – such as setpoint channel,
sequence control, communications, technology function, etc. – can be tested in
advance without a motor.
Another application is to test the correct functioning of the Power Module. Espe-
cially for drive units with higher power ratings 754 kW (690 V) and 110 kW (400 V),
after repairs, it is necessary to test the gating of the power semiconductors. This is
done by injecting a low DC voltage as DC link voltage (e.g. 12 V). The drive unit is
then powered-up and the pulses enabled. It must be possible to run through all of
the pulse patterns of the gating unit software.
This means that the software must allow the pulses to be switched-in and various
frequencies approached. If a speed encoder is not being used, this is generally
implemented using V/f control or sensorless closed-loop speed control.
Note
Simulation mode cannot be activated without a power unit. DRIVE-CLiQ must be
used to connect a power unit.
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© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition