Corrected from:
i700 servo inverter (encoder version), improved from HW 1D (no correction planned in SW)
Response of the new version:
From hardware version HW: 1D, the probability of occurrence has been considerably reduced by additional filters.
The described behaviour may, however, still occur sporadically.
What happens?
When reading out the absolute position from the Hiperface SinCos absolute value encoder, the warning 0x7381 (Hiperface absolute value not valid because motor speed is too high) may occur.
In this case, the absolute position from the encoder cannot be accepted because an excessive speed was detected despite the motor being at standstill.
When does this behaviour occur?
This behaviour occurs when parameterising a Hiperface SinCos absolute value encoder with a very low number of increments per revolution (0x2C42:1 < 10 inc./rev).
Interferences on the signal cables in the device can also have an effect on the evaluation of the feedback system so that - when reading out the absolute position from the encoder - falsely an excessive speed is determined.
Every time, the number of increments per revolution of the Hiperface SinCos absolute value encoder (0x2C42:1) is changed, the absolute position is read out from the encoder. This is the case when the system is switched on and every time when the parameter 0x2C42:1 is changed.
Which products are affected?
i700 servo inverter (encoder version)
Short-term measures:
Reinitialisation by mains switching.
Evaluation/recommendation:
The problem mainly concerns linear motor applications for which Hiperface SinCos absolute value encoders (linear scales) with the above-mentioned particularly low number of increments per revolution (0x2C42:1 < 10 inc./rev.) are used.
