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Old February 12th, 2018, 07:23 AM   #1
aar_shr
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Unhappy Help on ACS880 Braking Option

I need help on ACS 880 which I am controlling through Ethernet using ODVA AC/DC profile (Instance 121/171) . I am able to start stop the motor through Ethernet and give speed setpoint to the Drive also but when I try to decel in around 5 sec , it takes around 15 to 20 sec to stop the motor .

I have kept the stop mode to Ramp and I have also installed my brake resistor and connected to R+ and R- . When I give stop command I can see my start command go and setpoint also become zero but motor takes long time to stop. If I make decel time very low motor does not stop at all but it keeps on rotating at a very low frequency and only option is remove incoming power .

All motor parameters are properly set and ID run also done. In group 44 of parameter I have entered correctly the resistor setting but I am not sure whether to enable parameters in group 45 and what settings need to be done for it . Also which Stop shall I consider for stopping for ODVA profile since I am not giving any stop command but just removing the run forward command ..
Please help ???
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Old February 12th, 2018, 07:55 AM   #2
lfe
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Maybe it's the mechanical inertia of the moved load that makes the braking last longer. ?

Last edited by lfe; February 12th, 2018 at 07:57 AM.
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