blue’Log X series
89 | 120
14.4.2
cos
φ
(AI) procedure
In this procedure, the displacement factor cos
φ
is used as the control value.
The specified target value is provided by the grid operator as an analog input signal.
This is possible for example via a remote control system with an analog output
connected to an analog input of the blue’Log. The target value is calculated from the
analog value using a two-point linear equation. For configuration, the highest and
lowest measured values for the analog signal are required. These lie at the end and the
start of the line. The excitation type for each point must also be given.
Fig. 70: cos
φ
(AI) Power Control procedure: Setting measured values
Input box
Meaning
Analog input
Description of the analog input on the blue’Log
Lowest measurement
value
Value pair for the lowest operating point (example: 4 mA
corresponds to a cos
φ
of 0.95 overexcited)
Highest measurement
value
Value pair for the highest operating point (example:
20 mA corresponds to a cos
φ
of 0.95 under-excited)
Retain last value
If enabled, the last valid specified value is retained in the
event of an error. The fallback value loses its validity for
this procedure.
