Encoder Dirty Signal - Siemens Sinamics S120 Function Manual

6.17.2

Encoder dirty signal

Some encoders have an additional output, which switches from "high" to "low", if the
evaluation electronics in the encoder can no longer determine a reliable position.
In order to inform you about this, the drive only outputs alarm A3x470
used.
x = encoder number (x = 1, 2 or 3)
1)
Commissioning
Connect the corresponding encoder signal with the CTRL input (monitoring signal) of the
device. Parameterization is not required.
Note
The input is automatically set to a high level if a wire is broken: As a consequence, for a
broken wire, the encoder is considered to be "good".
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p0437[0...n] Sensor Module configuration extended
6.18 Tolerant encoder monitoring
The tolerant encoder monitoring offers the following expanded functionality regarding the
evaluation of encoder signals:
● Encoder track monitoring (Page 276)
● Zero mark tolerance (Page 277) (also for other sensor modules)
● Freeze speed raw value (Page 278)
● Adjustable hardware filter (Page 278)
● Edge evaluation of the zero mark (Page 279)
● Pole position adaptation (Page 280)
● Pulse number correction for faults (Page 281)
● Monitoring, tolerance band, pulse number (Page 282)
● Expansion of the encoder evaluation (1x, 4x) (Page 283)
● Setting the measuring time to evaluate speed "0" (Page 284)
● The number of current controller cycles can be set to generate the average value of the
These supplementary functions allow you to improve the evaluation of your encoder signals.
This may be necessary in special cases where the Control Unit receives incorrect encoder
signals or specific properties of the signals must be compensated for.
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
speed actual value (Page 284)
Basic functions
6.18 Tolerant encoder monitoring
when an SMC30 is
1)
275