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Thread: Problems with vfd
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4th June 2018, 02:25 PM #1Novice
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Problems with vfd
Hi folks, I have just acquired a new (old) 3hp 3ph lathe. As I only have single phase to the property I elected to go the VFD route for the lathe. I have wired up the VFD as per instructiions, the pretty lights flash and numbers appear on the screen but the motor isn't turning!
What have I done wrong??
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4th June 2018 02:25 PM # ADSGoogle Adsense Advertisement
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4th June 2018, 02:33 PM #2SENIOR MEMBER
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you need to tell us the make of the VFD. Also the code shown on the display...
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4th June 2018, 03:04 PM #3.
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4th June 2018, 03:23 PM #4
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5th June 2018, 10:58 AM #5Novice
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VFD problems revisited
Alright guys, thanks to all of you for offering your expertise.
The VFD is an ISACON unit rated 2.2kw20180605_090434.jpg see label. According to the advertising blurb it is good for up to 3hp.
My wiring is shown in the next photo20180605_085344.jpg I have the 240v on the left connected to L and N, the 3ph to the right connected to U, V and W, with both Earths going to the Earth terminal.
The motor end panel is shown here 20180605_090310.jpg the info shown on the panel is here 20180605_085352.jpg and there is a switch twixt VFD and motor 20180605_085512.jpg and that is how it was when I bought it.
When I press 'Run' the indicator cycles up to 400 with 'fwd' and 'panel' lights glowing. I hear a noise (fan?) with an increasing pitch.
If I press 'rev' the indicator cycles down from 400 to 0 and then back up to 400, the noise following the numbers in terms of pitch.
All I have done is to wire the VFD into the circuit as per the wiring diagram supplied with the VFD. Unfortunately, the majority of the "User Manual" which includes the wiring diagram is just so much 'gobbledygook', I can't make head or tail of it.
All through the procedures above, the motor shaft does not move at all.
Here's hoping!
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5th June 2018, 11:51 AM #6.
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This is far from ideal.
In most cases there should be nothing between the VFD and the motor.
If you repeatedly try to start the VFD with something like that switch in between you may damage the VFD and the motor.
Before you do anything else you should remove that switch.
When I press 'Run' the indicator cycles up to 400 with 'fwd' and 'panel' lights glowing. I hear a noise (fan?) with an increasing pitch.
If I press 'rev' the indicator cycles down from 400 to 0 and then back up to 400, the noise following the numbers in terms of pitch.
I have learned NEVER to trust a VFD straight out of the box - someone could have played with it and you don't just don't know what the settings are
I suggest a complete parameter reset back to factory settings - then you should know where the VFD is starting from.
Then set the motor parameters, slowish acceleration and deceleration times and max Frequency on the VFD
This is minimum number of parameters that need reseting BEFORE the motor is starting
Unfortunately, the majority of the "User Manual" which includes the wiring diagram is just so much 'gobbledygook', I can't make head or tail of it.
All through the procedures above, the motor shaft does not move at all.
Here's hoping!
BTW That motor is a Y connected 415V motor. As is it will develop less than half its power using a 240V VFD. To make it develop full power it has to be reconfigured as a ∆ motor.
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5th June 2018, 04:09 PM #7Novice
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OK Bob, I accept what you are saying. Bear in mind that it is very difficult to check the manual before you buy the thing!
I will remove the switch as suggested. As to re-setting the parameters back to the factory set-up, there is no information in the manual on how to go about this.
There is a page headed 'Parameter set method' but I have no idea what those parameters are supposed to be! If you can advise I would appreciate it.
I will look into how I can access the motor to reconfigure it as 'Delta'.
Tern-about
PS: my motor has only four terminals on it and I can't figure how that can be configured for Delta.
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5th June 2018, 04:55 PM #8.
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A quality VFD supplier will provide the manual before you buy. A company like Powtran has all their manuals on their website or you can ask and they will email them to you.
How much was your VFD?
As to re-setting the parameters back to the factory set-up, there is no information in the manual on how to go about this.[
There is a page headed 'Parameter set method' but I have no idea what those parameters are supposed to be! If you can advise I would appreciate it.
I will look into how I can access the motor to reconfigure it as 'Delta'.
Can you open up the motor connection box and provide a photo of the inside of the box.
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5th June 2018, 06:50 PM #9DISCLAIMER
No liability is accepted by UBeaut or the Wood Working Forum's administrators
or moderators for advice offered by members posting replies
or asking questions regarding electrical work.
We strongly advise contacting a Licensed Tradeperson for all electrical work.WARNING
Information supplied within posts is not to be considered as detailed formal instructions to complete a task.
Members following such information do so at their own risk
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6th June 2018, 12:38 AM #10GOLD MEMBER
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Tern-About,
Some years ago I bought a VFD for a 3 phase motor I had. The printed instructions that came with the VFD were incomprehensible but the mini CD that came with it had much more information. You may be able to download more information from the company web site or to get specific instructions from their customer service.So much timber, so little time.
Paul
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6th June 2018, 03:27 PM #11Novice
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Hey Bob, here's a shot inside the connection box.20180606_090452.jpg
Which part/s of the manual do you need? Thanks for all your help.
PS is a run-of-the-mill sparky going to know about these things or do I need a specialist?
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6th June 2018, 04:45 PM #12.
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It appears the motor can be converted to 240V Delta in this box.
Based on what's happened so far I recommend getting someone qualified to do it.
I am also not a qualified to be giving advice - I'll leave that to someone that is?
PS is a run-of-the-mill sparky going to know about these things or do I need a specialist?
Which part/s of the manual do you need? Thanks for all your help.
In the end I felt obliged to go to their shed and fix it for them which I did.
Maybe you should see if there is someone local that has VFD experience that can sit down with the manual and the VFD and then work through how to change the parameters together.
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6th June 2018, 05:22 PM #13Novice
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Thanks anyway Bob.
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6th June 2018, 06:11 PM #14
I will be heading down to the Gong for work in a couple of weeks. If you haven't got it sorted by then I will see if I can drop in and get it running for you.
Those were the droids I was looking for.
https://autoblastgates.com.au
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