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Thread: VFD outputs
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29th Aug 2020, 12:19 AM #31Most Valued Member
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I installed one of the Folinn VFD’s from them recently on a mate’s Brobo saw.
Nice and easy, manual was great.
Steve
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29th Aug 2020, 07:36 AM #32Intermediate Member
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Geez must of been a doozie of a saw!!
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29th Aug 2020, 08:40 AM #33Intermediate Member
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That last comment was pretty dumb on my part , of course most industrial type cold saws would probably be 3 PH.
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29th Aug 2020, 10:11 AM #34Most Valued Member
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I have a Folinn VFD from Conon Motor on my lathe. Happy with the VFD and their service. The manual is very extensive, but I did find myself bouncing back and forth between sections at times trying to get my head around what some of the parameters were for (hint- you only need to fiddle with about 10% of them).
Chris
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29th Aug 2020, 11:12 AM #35Most Valued Member
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If you had a 2.5kW drive connected to a 1kW motor (assuming the drive is set up correctly) and it’s still going out on over current, I would suggest there’s a problem with the movement of the knee assembly.
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29th Aug 2020, 04:39 PM #36Intermediate Member
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Just confirming VFD`s on hand won't even try to start motor in Delta 230v The motor is unloaded on start up and engaged mechanically
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29th Aug 2020, 06:05 PM #37Member: Blue and white apron brigade
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29th Aug 2020, 07:43 PM #38Senior Member
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Just to eliminate any confusion on my part is the VFD always connected to the motor and then the start command given, and the drive trips, or is the VFD started, ramp completed and then some time later the motor is connected via a contactor or switch, tripping the drive.
John
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29th Aug 2020, 07:50 PM #39Most Valued Member
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29th Aug 2020, 08:07 PM #40Most Valued Member
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Two VFDs won’t start an unloaded motor says you’ve got a problem with the motor. If you converted it from star to delta, that would be where I would start looking. The over current condition suggests to me you likely have the windings either out of sequence or one of them reversed.
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29th Aug 2020, 10:23 PM #41Intermediate Member
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Probably not much use Bob as I have already removed the star connection links and pulled another 3 cables through the machine to make star point in control box at the moment all connections are hanging in the breeze labeled U1. U2 V1 V2. W1 W2. this is all prior to making a decision to the path ahead . ( more enhanced unit or star/ delta start it , nothing ventured nothing gained. )
For, Guzzjohn. Motor is cconnected to VFD 230 v Delta , The set frequency is flashing , the remote start signal to VFD is closed , instant over current message , end of story/. Star connected no worries.
For Jack620. Same scenario. 2.5 or 1.5. KW VFD they are both the same brand both lacking parameter inputs regarding motor current
For racing tadpole . I doubt it . I have paired up the individual windings more than once.
The motor is rated 220 volt delta 5 amps . When I have successfully started it Star/ Delta run amps is about 4.8 A maximum load.
IMG_20200829_193440990_HDR.jpgIMG_20200829_193139392.jpgIMG_20200829_193932646_HDR.jpgfullsizeoutput_51.jpg The last photo shows my star/ delta start setup I won't bore you with how it works but it does.
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29th Aug 2020, 11:01 PM #42Member: Blue and white apron brigade
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I agree with racingtadpole
If the motor runs on Y but not on ∆ then the pairing up of the motor wires sounds like the place to look
I suggest forgetting the Y/∆ switch for the mo - too many wires to get angle up with just practice getting the connections right in the motor connection box first
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30th Aug 2020, 09:46 AM #43Senior Member
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Thanks for the update. Some other suggestion- I think you said the motor runs ok mechanically unloaded in delta.
If you set a ramp of say 10 seconds does the motor actually accelerate steadily over this time or does to jump straight to full speed.
The other test would be to set the max speed to about 10Hz. Confirm the motor is running slowly in delta unloaded then try under load.
John
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30th Aug 2020, 09:53 AM #44Intermediate Member
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While not being infallible and I don't think dementia an issue yet I have been `practicing` since 1969
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30th Aug 2020, 10:36 AM #45Most Valued Member
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And yet you still can't make it work. People with knowledge about these things (and I don't include myself) are telling you there's something wrong with your motor's wiring. You seem strangely resistant to that possibility.
Chris
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