Description Of Encoder Signals; Encoder Breakage Recognition - KEB COMBIVERT F5 Betriebsanleitung

EnDat at Channel 1
3.3.3 Input signals channel 1
3.3.3.1 Process data channel
Figure 3.3.3.1
3.3.3.2

Description of encoder signals

During start-up and then all 30 ms an inquiry is transmitted to the encoder and the absolute
position is serial read out. Thus a reference point search is not necessary.
As the increments per revolution are stored in the encoder, error Ec.37 = 70 is triggered
immediately, if a deviating value is entered in Ec.1.
A position difference is tracked after filter with ramp time. If this difference increases to quic-
kly, so that it cannot keep tracked or a max. value is exceeded (e.g.at encoder breakage),
the interface state Ec.37 changes to „69" and the inverter switches off.
The clock signal is used for synchronization.
3.3.3.3

Encoder breakage recognition

The recognition of encoder breakage is a software function and dependent on the encoder
type. Encoder breakage is noticeable only during encoder rotation.By writing on Ec.0 the
initialization starts. After fault-free initialization the correct position will be send.
The incremental track is monitored approx. all 16 ms. An error is triggered, if the permissi-
ble signal levels are fallen below. Also the absolute track, i.e. the serial communication to
the encoder is monitored. If the encoder gives not an answer, or a communication is not
possible, the respective state message will be transmitted to the inverter. Dependent on the
encoder type the response time can be 100 ms and more.
GB - 8
Signal form A and B respectively to differential operation
360°mechanical
Increments per revolution
A
0
B
0
typically 1 Vss
typically 1 Vss