Response of the new version: If an encoder error occurs as a result of another error, it is correctly switched to DC-injection braking, if configured accordingly.
What happens? In the event of an encoder error, e.g. an open circuit, it is sporadically not switched to DC-injection braking to brake the motor without feedback system in a controlled manner. As a consequence, the motor can continue rotating for a limited time until another monitoring function will respond.
When does the problem occur? The problem arises if an encoder error occurs while the drive is still in the 'Fault reaction active' state due to another error message.
In this state, an encoder error will - under certain timing conditions - not be correctly classified as another error, but as a warning. As a consequence, it is not switched to DC-injection braking/short-circuit braking.
Which products are affected? - i700 servo inverter, only V01.05.06.9665
Short-term measures/recommendations:
Do not activate the DC-injection braking function after quick stop.
Evaluation:
It is not very likely that the above-described behaviour will occur. If it occurs, the motor will only continue rotating for a limited time.
