[etherlab-users] control problem in servo motor

[Yin]

    Hi, I have encountered a problem and have no idea about the reason.
I wrote an application program by using the etherlab ethercat library and
tested the servo in profile velocity mode. I set the mode, target velocity
and wrote controlword to switch to operation state.
    But curiously, sometimes it run successfully and sometimes not. For the
unsuccessful times, the error was almost over current or over speed, but the
program was the same one. I tried to change target velocity to small, the error
occurred as usual except changing to zero. The servo would be ok if I recovered
it's configuration or just did nothing.
    I really want to know the reason about this problem, is it my program have
something wrong?

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