5 Motor control & motor settings
5.9 Setting the feedback system for the servo control
95
Lenze · i700 servo inverter · reference manual · DMS 3.0 EN · 06/2016 · TD06
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The 0x2C42:4
object displays the signal amplitude of the encoder as a nominal value in percent.
Standard encoders provide 1 Vss (peak value 0.5 V) on the signal cables. In such a case, 100 % are
displayed in the object.
Open-circuit monitoring
The open-circuit monitoring of the i700 detects an error if the amplitude value has decreased
several times in a row to less than 73 % or increased to more than 126 %. For a reliable operation,
we recommend a signal amplitude in a range of 90 % ... 110 %.
If open circuit messages occur sporadically (e.g. due to defective wiring), the signal in the
oscilloscope can be used for recording and analysis. Here, not every fault is displayed since the
update rate of the internal monitoring is considerably higher compared to the 0x2C42:4
object or
the oscilloscope:
• 20 ms ... 30 ms for the object 0x2C42:4
/ the oscilloscope
•62.5μs for the internal monitoring
From version 01.06.05, the sensitivity of open-circuit monitoring can be set in percent by the
0x2C47
object. The reduction of the monitoring sensitivity in case of an EMC-polluted environment
has proven advantageous.
Note!
A reduced sensitivity causes a delayed response to real open circuits!
If the sensitivity is not reduced (100 %), the software response time of the monitoring is
• approx. 3.5 ms for an encoder
•0.3ms for a resolver.
Halving the sensitivity results in a doubling of the response time.
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