Which products are affected?
9300EP servo positioning controller version V2.1
What happens?
The drive overspeeds (reversing) until a stop by the following error monitoring function. The following-error monitoring function only intervenes if a following error has in fact built up. This depends on the set parameters.
When does the problem occur?
When positioning with S-ramp it was possible for the drive to sporadically overspeed (reversing) in the following situation until a stop by the following-error monitoring function:
- S-ramp with velocity changeover between two program sets (PS).
- The distance available is not sufficient to reach ultimate velocity.
- Change in V-Override during travel, increases the probability that the fault will occur, especially if PARAM-RD = 1 to accept the changed V-Override.
Possible diagnostics?
The response occurs sporadically, especially when using S-ramps and the PARAM-RD function for immediate acceptance of new profile parameters.
Short-term measures/recommendations?
The following points must be observed in order to avoid occurrence of the phenomenon described:
- The distance available must be sufficient to reach ultimate velocity with the preset profile parameters.
- In velocity changeover with S-ramp and Override never use the PARAM-RD function.
Evaluation:
Judging from experience, the situation described above, in which the response occurs sporadically, tends to be encountered rather seldom in practice. One application is known in which the velocities had to be changed during positioning with S-ramp and velocity changeover in order to adapt and optimise the loading cycle of a press.
