Question:
Which limit values base on the encoder-wire breakage-monitoring?
Answer:
For the monitoring the encoder types 'sine-cosine-encoder' and 'TTL-encoder' must be differed.
The reaction on an encoder-wire breakage is set in code C00580 for both types.
Sine-cosine-encoder:
With those encoders the so-called encoder radius (sin² + cos² = 1) is monitored. It is only available inside the Engineers oscilloscope with the vaiable Common.dnLinearTechnologyEncoderRadius (variable from the motor control).
The original signal must be adapted, i. e. a value of 2^31 is equivalent to 7.78516433 V². The lower failure limit is equal to 0.0798 V² the upper limit is 0.42575 V².
The signals of the single tracks will not be monitored to their amplitudes seperately. But from the recalculation of the encoder radius the outcome is that the signal level has to be between 0.57 V and 1.30 V. The signals can be measured with a hardware oscilloscope or the Engineers oscilloscope.
TTL-encoder:
The signals are compared to the mean value. The mean value has to be between 1.3 V and 3.4 V. In case of encoder voltage of 5 V the mean value is approx. 2.5 V.
Moreover, the signal amplitude is monitored. It has to be between 3.0 V and 6.0 V in case of High level.
Note:
In case of the sine-cosine-encoder the signal levels are measured differentially between the terminals 3 and 11 (Sin and RefSin) or 1 and 9 (Cos and RefCos).
In case of the TTL-encoders the measurement is executed with regard to the ground of the supply between terminals 1, 3, 9, 11 and 4 (A, B, /A, /B and GND).
