Reference loss in case of brief interruption (5..8ms) of the 24V supply (corrected from V01.07.04)
Corrected from:
Servo-Inverter i950 FW: from V01.07.04.2313
Response of the new version:
Even in the event of a brief interruption of the 24V supply, the status 'Reference known' is now correctly initialised and the actual position correctly reconstructed.
What happens?
Despite the use of an absolute encoder, the status 'Reference known' is lost in the event of a brief interruption of the 24V supply and the actual position is not reconstructed as expected.
When does the behaviour occur?
When the 24V supply to the i950's control board is briefly interrupted, e.g. during mains switching,
when the voltage has dropped to about 14-18V, and then
then the 24V power supply returns.
Cause:
when switching on again (initialising) while the unit is in the process of shutting down, it can happen that waiting for a complete encoder initialisation is bypassed via the unit status control and an incorrect status is routed to the higher-level motion control. As a result, the described behaviour occurs.
The interruption duration of the 24V supply must not typically be in the time range of 5...8 ms (depending on external capacitances on the supply line and in the power supply unit, as well as the connected IOs and encoders on the i950). In this time range it can happen that the 24V voltage drops down to the range of 14...18V.
If the 24V supply remains interrupted for a longer period of time, the described behaviour does not occur.
