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Thread: VFD install summaries
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31st October 2017, 02:34 PM #106
Just pulled the trigger on a couple more VFDs. Spoke Powtran and getting a couple of PI9130B units (1.5kw and .75kw) for my Vicmarc lathe and Waldown drill press respectively.
Could have ordered the cheaper PI130/160 units but I prefer the cable grommets on the 9130 and felt the external heatsink and fans were a better idea too. And the prices were more than reasonable, with shipping they were around $200 each.
Just need to order some motors for both of them now, they’ll both be getting WEG W21 units, going to place the order later on today if I get the time.
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31st October 2017, 03:40 PM #107.
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The heatsinks and fans are definitely more rugged on the 130 versus the 160 units but given the loads involved, neither a lathe or a DP operate at loads warrant that level of heat removal. The loads that a 130 expects to deal with would be more akin to the constant loads imposed by a fan or a pump i.e. 24/7 operation.
However, the cable grommets that allow for the use of proper cable glands is a real plus on the 160 and a good enough reason to get the 130 over the 160 in my book.
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31st October 2017, 04:23 PM #108
Cheers Bob! The main reason I thought the external heatsink would be a better idea is because it gets the fan outside the unit, hopefully reducing the amount of dust that gets sucked into the VFD internals. And yeah the grommets were a big deal for me, I don't really want any cables hanging out so they were enough for me to spend the extra money.
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31st October 2017, 06:06 PM #109.
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Yesterday when finalising the VFD/Brake connection to the Mens Shed RAS I noticed it was running backwards. Given I was just testing the brake I didn't bother about the direction and checked the blade didn't come loose by starting and stopping the machine a half dozen times. Then I tidied up all the cabling and control lines - tested again - all good. Last of all I set about restoring the correct direction.
Normally you would do this at the motor end - just exchange any two of the phases and this changes the motor direction but the motor connect box was not as easy to get at as the mains contractor switch that powers the VFD so I just reversed 2 of the phases in the contractor and walked away without testing it and assumed it would run correctly.
This morning I got a call from the duty supervisor - still running backwards. I managed to get there this arvo and repeated what I had done yesterday - still reversing.
Then it dawned on me that the contractor/switch is on the mains side of the VFD and the first thing a VFD does to mains power is converts it into DC. Then the VFD chops the DC to recreate AC according to what Frequency and phases the VFD decides, so to reverse the motor requires switching two of the phases between the VFD and the motor. I did that and that worked.
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14th November 2017, 05:36 PM #110.
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Here are a couple of Photos of the VFD an brake install on the RAS at the mens shed.
As a I said a few posts back the VFD and Braking unit are installed under the table behind the KHS front leg of the table itself.
The brake is the grey silver box underneath the VFD.
It look a bit exposed but it is actually quite well sheltered/
VFDandBrake.jpg
Are is the main operator control.
A 3P actuator needs to be switched to power the VFD but one that is on it is usually left on till the end of the day or unless no other cuts are going to be made.
The Vac Sensor detects vacuum in the DC line and is connected in series with the On/off switch.
If the DC is not on, or the gate not opened the saw will not start.
COntrols.jpg
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24th November 2017, 03:10 PM #111Intermediate Member
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Thanks all for the ongoing upkeep of information on this thread. I will have to go back through and read this all again taking notes as I go so I can try and get more of an understanding of it all. Well enough to get me going at least.
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24th November 2017, 05:34 PM #112GOLD MEMBER
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24th November 2017, 07:06 PM #113.
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Good point.
I might still do that even though SOP does not utilise the keyboard as it is locked out from normal operator use.
The SOP does includes a specific statement about letting the saw get up to speed before use so allowing operators to see the actual running frequency would probably be useful.
In terms of setting up using the keyboard I did that prior to installing the VFD under the bench. I did need to make a minor adjustment after installation and to do that I removed the keyboard and used a UTP cable extension so I could program it from the table top.
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24th November 2017, 07:25 PM #114GOLD MEMBER
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I don't know what a UTP cable is but a CAT6 plugs straight in.
CHRIS
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24th November 2017, 07:45 PM #115.
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UTP - "unshielded twisted pair" cable, it was our generic term for standard Cat5 "ethernet cables" at work.
Cat6 is a specific cable rating (minimum 250 MHz) - is available as shielded or unshielded TPs.
The VFD keyboard does not need a highly frequency rated cable and provided all pairs of wires are present even a Cat5 rated cable will work.
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24th November 2017, 08:43 PM #116GOLD MEMBER
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Yes, but I only have cat 6. We used to use cat 5 to do the same years ago thing before 6 became common.
CHRIS
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25th February 2018, 01:01 AM #117.
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This is small issue but it might just help someone in the future so I thought I would post it anyway.
A local mens shed (43 km away from where I live) purchased a Clearvue Cyclone on my recommendation and I suggested they also get a Powtran VFD but that they buy it direct from Powtran in China. The sparky at that shed said he had installed many VFDs in grain silo conveyor motors over 20 years so I guessed he would be OK at setting it up. Anyway it turned out that he could not get the VFD to even start the motor and so they called me. I made several suggestions including a factory reset which the said they had already tried so I went down to see them last Friday.
They ran through what parameters they had set but I figured a factory reset would be the quickest and easiest way to reset things. When I asked them to show me how they did the factory reset they indicated that they followed the example at the front of the manual. Turns out that this is a factory reset for all parameters EXCEPT FOR THE MOTOR parameters. So I then got the sparky to perform a full factory reset and everything worked as expected. A few quick parameter change to allow for up to 60Hz operation and they were in business.
The sparky was a bit embarrassed but it turns out he had never actually set up VFD parameters before. All the VFDs he had installed previously had been provided as preprogrammed units and all he ever did was wire them up according to a spec sheet.
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27th February 2018, 10:20 PM #118SENIOR MEMBER
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Bob, do these drives have any Australian or International recognized approval?
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27th February 2018, 10:43 PM #119.
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27th February 2018, 11:04 PM #120SENIOR MEMBER
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