Siemens SINAMICS G120D - Page 135

Setting functions
8.4 Setpoint calculation
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
135
Table 8- 14 Parameters for setting the scaling
Parameter
Description
p1138
Up ramp scaling
(factory setting: 1)
Signal source for scaling the up ramp.
p1139
Down ramp scaling
(factory setting: 1)
Signal source for scaling the down ramp.
Example
In the following example, the higher-level control sets the ramp-up and ramp-down times of
the inverter via PROFIBUS.
Figure 8-13 Example for changing the ramp-function generator times in operation
Preconditions
● You have commissioned the communication between the inverter and the control system.
● Free telegram 999 has been set in the inverter and in your higher-level control system.
See also Section: Extend telegrams and change signal interconnection (Page 109).
● The controller sends the scaling value to the inverter in PZD 3.
Procedure
To interconnect the scaling of the ramp-up and ramp-down times with PZD receive word 3
from the fieldbus in the inverter, proceed as follows:
1. Set p1138 = 2050[2].
This means that you have interconnected the scaling factor for the ramp-up time with
PZD receive word 3.
2. Set p1139 = 2050[2].
This means that you have interconnected the scaling factor for the ramp-down time with
PZD receive word 3.
The inverter receives the value for scaling the ramp-up and ramp-down times via PZD
receive word 3.