Siemens SINAMICS G120P, Operating Instructions Manual

Page: 349 / 496

Functions
7.4 Setpoint calculation
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
349
7.4 Setpoint calculation
7.4.1 Overview of setpoint processing
The setpoint can be modified as follows using the setpoint processing:
● Invert setpoint to reverse the motor direction of rotation (reversing).
● Inhibit positive or negative direction of rotation, e.g. for conveyor belts, pumps or fans.
● Minimum speed to avoid standstill when the motor is switched on.
● Skip frequency bands to prevent mechanical resonance effects at specific speeds.
● Limit to a maximum speed to protect the motor and mechanical system.
● Ramp-function generator to accelerate and brake the motor with an optimum torque.
Figure 7-14 Setpoint processing in the inverter
7.4.2 Invert setpoint
Proceed as follows to invert the setpoint:
Interconnect parameter p1113 with a binary signal,
e.g. digital input 1.
Table 7- 15 Examples of settings to invert the setpoint
Parameter Remark
p1113 = 722.1 Setpoint inversion
Digital input 1 = 0: Setpoint remains unchanged.
Digital input 1 = 1: Setpoint is inverted.
p1113 = 2090.11 Invert setpoint via control word 1, bit 11.