PowerFlex 700
- Thread starter hazey
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srehmanakhtar
Member
Yeah! it will not run even all the condition are true. if reference voltage would be 0volts.
carefull about this if the drive is enabled and in run fwd or rev .You may want to give it a stop command lets say your using a pot to control speed and the signal is 0.7 volts and you have a heavy load on your motor the operator doesn't see the thing moving but the drive is outputing voltage just not enough to move the motor or the fan on the back of the motor do you think the motor will heat up? I dont think the OP is trying to do this.
as for the standby I dont know what does your manual say?
as for the standby I dont know what does your manual say?
The drive will try to maintain zero speed. Look at the current the drive is using in this condition. The drive will actually hold the motor motionless. In other words, if you try to turn the shaft by hand you will not be able to. In a stopped condition, you can turn the shaft.
Mark Snodgrass
Member
Just had this happen to me, operator did not put in schedule right such that the fans were told to run, but at zero hz. The drive was still putting out 30 amps of current even in that state (drive supplies 5 fan motors for a kiln). It will show as being at speed.
You must be careful to send a stop signal to the drive or you may have some overheating issues depending on your setup. As far as I know, the drive will stay like that as long as you give it the signal.
Mark
You must be careful to send a stop signal to the drive or you may have some overheating issues depending on your setup. As far as I know, the drive will stay like that as long as you give it the signal.
Mark
gravedigger02
Member
What type of feedback are you using? If there is 0 volts at the reference and the feedback is 0 (if there is a feedback device), I believe it will show "at speed".
allscott
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- Jul 2004
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- 1,332
Careful! The drive will technically be "running", the motor will just not be turning.
Assuming the drive is set up in vector control the drive will attempt to hold the motor at 0 speed.
As long as the motor is rated as vector duty the motor will not overheat.
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allscott
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- Jul 2004
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No it will sit there indefinately. The drive "thinks" that it is trying to hold the motor at zero speed and will attempt to do that ie: the shaft won't budge even if you try.
This is assuming again that the drive is set up in vector control.
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allscott
Member
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- Jul 2004
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No. An inverter duty motor simply means the motor is designed to run off of a VFD. It will probably rely on a shaft fan for cooling.
A vector duty motor will have no shaft fan. It will either have no fan at all or be force fed by a blower. There are performance differences between the two as well.
A vector duty motor will run all day at 0 speed and full torque and not overheat. An inverter duty motor probably won't as it is relying on the shaft fan for cooling and if it ain't turning...
Down there you have "biscuits and gravy" We don't
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up there you get rain we dont. LOL
thanks for the info sometimes i have trouble with others terms here on this fourm just wanted to be sure. I see lots of apps where someone has just thrown a drive on whatever motor is in place and not consider these things.
thanks for the info sometimes i have trouble with others terms here on this fourm just wanted to be sure. I see lots of apps where someone has just thrown a drive on whatever motor is in place and not consider these things.
allscott
Member
- Join Date
- Jul 2004
- Posts
- 1,332
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