Functions
8.13 Setpoint channel
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-59
8.13 Setpoint channel
Description
The setpoint channel (see figure below) forms the coupling element between the setpoint
source and the closed-loop motor control. The SINAMICS G120 inverter has a special
characteristic which allows the setpoint to be entered simultaneously from two setpoint
sources. The generation and subsequent modification (influencing the direction, suppression
frequency, up/down ramp) of the complete setpoint is carried-out in the setpoint channel.
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Figure 8-40 Setpoint channel
8.13.1 Summation and modification of frequency setpoint
Data
Parameter range: P1070 … r1114
Warnings: -
Fault: -
Function chart number: FP5000, FP5200
Description
For applications where the control quantities are generated from central control systems, fine
tuning is often required locally on-site (correction quantity). For SINAMICS G120, this can be
elegantly realized using the summation point where the main and supplementary (additional)
setpoints are added in the setpoint channel. In this case, both quantities are simultaneously
read-in through two separate or one setpoint source and summed in the setpoint channel.
Depending on external circumstances, the supplementary setpoint can be dynamically
disconnected or switched-in to the summation point (see figure below). This functionality can
be used to advantage, especially for discontinuous processes.
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