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Old September 14th, 2021, 03:48 PM   #1
calinorth
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Powerflex 525 VFD Motor Stalled Fault

I am getting a motor stalled fault on a VFD for a incline conveyor motor with a electric brake. I notice that when the VFD is supposed to ramp down to off it stays stuck at 7 hz then it trips. Is this feedback? Do I need a brake(resistor) for this VFD?
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Old September 14th, 2021, 04:30 PM   #2
Ken Roach
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This could be a motor sizing issue or a tuning issue.

Have you tried changing the Stop Mode to "Coast", and will that be suitable for your application ?

Tuning and configuring to address F006 Motor Stalled faults is addressed in the RA Knowledgebase (Access Level: Everyone):

https://rockwellautomation.custhelp....US#__highlight
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Old September 14th, 2021, 04:33 PM   #3
Jim3846
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maybe your em brake on/off delay is too long. Default is 2sec, change to .2sec see if that prevents stall?

Do you have your stop mode set to ramp+em brk parm 45?
t076 is for em brake control make sure that pulls your brake off and on when its supposed to during operation?

I think thats all the parameters that affect brake control.
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Old September 14th, 2021, 07:56 PM   #4
calinorth
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Yes for some reason it was set ramp down to default at 2 seconds even though the mechanical brake engages immediately. I will monitor this drive until midday tomorrow. Ill be sure to post an update.
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Old September 14th, 2021, 08:11 PM   #5
Ken Roach
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Is the mechanical brake controlled by the drive itself, or separately ?

Yeah, dropping the mechanical brake on it while it's ramping to a stop will definitely cause a Stall fault.
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Old September 15th, 2021, 04:12 PM   #6
GaryS
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At 7 Hz you can't develope the require torque to move the load
they should be setting thee brake and shutting down the drive
you may be able to run it that low with a good flux vector drive
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