Panasonic dv-700 inverter

[Paul BoscottParticipant @paulboscott25817]

I have obtained  a Panasonic dv-700 inverter 1.5A that works but I am looking for a manual so as to be able to connect up the remote start stop and speed control also I think that I need to configure it to suite the motor I am wanting to use

 

Can anyone help

 

Paul

 

 

 

[Paul BoscottParticipant @paulboscott25817]

[geoffParticipant @geoff]

hi paul

do a google search and you will find the installation guide listed

regards geoff

[chris stephensParticipant @chrisstephens63393]

While on the subject of inverters, mine causes radio interference on medium and long wave. Which do I need to cure this, an in line mains RFI filter or screened lead to the motor or both. What are the experts views?

chriStephens 

[Paul BoscottParticipant @paulboscott25817]

Hello Geoff

 

Would you be so kind as to let me know the actual address of the page you have found as the ones I turned up refer to a Panasonic Projector with a similar number

 

thank you

 

Paul

[geoffParticipant @geoff]

hi paul

i just typed in panasonic dv700 invertor and it immediately came up with a selection of manuals hope you find it

regards geoff

[Anonymous]

Is the radio mains powered or battery operated? If battery operated, then the interference will be airborne. If, for the time being, we assume that the inverter has a PFC in the front end, then the motor leads are the most likely to be radiating.

 

In short, try screening the motor leads as a start. Be careful to avoid current loops in the screen.

 

Regards,

 

Andrew

[Steve GarnettParticipant @stevegarnett62550]

Posted by Andrew Johnston on 20/10/2010 10:35:59:

 

In short, try screening the motor leads as a start. Be careful to avoid current loops in the screen.

 

Just to expand on that slightly – this means that a ground connection to the screen around the leads should only be made at one end, and the other end left floating. It’s important to note that this should not affect the earthing (grounding) of the machine at all – that should be a separate connection. What Andrew is correctly trying to prevent is any leakage current flowing through both paths, because that increases the chance of radiation somewhat in most circumstances.

 

If you’re in any doubt about doing this, get somebody who knows about it to do the job.

[Anonymous]

Steve: thanks for elucidating what I should have said in the first place.

 

Regards,

 

Andrew

[KWILParticipant @kwil]

Yes you should use the manufacturer’s recommended filter. There is no doubt these devices do generate RFI in varying amounts. I have filters and screened multiway cables with one end grounded as per instructions on all my installed Inverters.  Manuals usually show which cables may/should be grouped. Type SY-Multi-Flex cables are excellent for this use. Very flexible and transparent smooth outer sheath.

[chris stephensParticipant @chrisstephens63393]

Thanks Guys, will try a battery radio first then proceed accordingly.

Just had a thought, if the inverter to motor leads need screening, surely the inverter itself would also need screening?

chriStephens 

[Steve GarnettParticipant @stevegarnett62550]

Most of them have screening internally for the parts and lines that are most likely to radiate. But because of the physical size of these bits in the box, they aren’t as likely to radiate anything like as much as what amounts to the aerial that the leads to the motor creates.

 

Oh, and I’ve had a search for any real references to the inverter that the OP wants to know about, and all the Google links lead absolutely nowhere – it doesn’t seem to be easily available, either as a Panasonic download or a Matsushita (parent company who probably made it) one either.

Edited By Steve Garnett on 20/10/2010 12:39:22

[chris stephensParticipant @chrisstephens63393]

Thanks again.

[Colin GibsonParticipant @colingibson15203]

Screening with 'SY' cable is the right way to go, as described above. If this is a 230V inverter, take care if you fit an EMC filter and have an RCD protected supply. The Filters have capacitors connected to earth and the small amount of current passing through them may trip your RCD.

[John FieldingParticipant @johnfielding34086]

The Filters have capacitors connected to earth and the small amount of current passing through them may trip your RCD.

Only if one of the capacitors has gone open circuit.

The typical EMC filter has two types of capacitors fitted. One is the Y type which has two capacitors fitted, one from the line terminal to ground and the other from neutral to ground. These caps are the same value so the supply is balanced. The one at the appliance end of the filter is a X type which goes from line to neutral. If all of these caps are working the imbalance on the mains supply is zero.

[David JuppParticipant @davidjupp51506]

 

If RFI is a significant issue, CY cable is preferred over SY for connecting the motor. Also, contrary to what has been said above, don't worry about ground loops (that is an issue for the control connections, not really for the cable to motor). For the power cables better to have earths everywhere you can get them.

Most inverters (not all) are designed to be mounted in a control panel (i.e. a metal box). Mount inverter securely on metal backplane, ground the screen of motor cables to the backplane close to the inverter (or use. EMC bracket if supplied), a saddle clamp over the screen is one method.

If an RFI filter is used in the supply, mount it on the backplane, as close as possible to the inverter.

Ensure door of control cabinet is earthed – the simple mains earth cable won't do much at RF frequencies, add either a braided copper strap or use semi-conductive foam or mesh door seal.

Keep motor cables as short as possible – if motor cables become too long, an output filter may be needed, these are bulky and expensive.

Use metallic cable glands (preferably proper EMC rated ones) to attach the motor cable to motor terminal box and to the control cabinet.

Edited By David Jupp on 27/04/2016 09:58:58

[BikepeteParticipant @bikepete]

Manual appears to be here – for the DV700T model, rather than DV700, but worth a try:

**LINK**

[Colin GibsonParticipant @colingibson15203]

John, thanks for the explanation. As The Inverterdrive Supermarket we supply large numbers of Inverter Drives, mostly to Industry, but a great many go to home users. When we get the chance, we advise Customers to use the types we know have low leakage or a means of removing the filter. One make I can think of has high leakage for its domestic level built in filters at 70mA (Manufacturers own figure). Many of the other makes are between 10mA and 20mA for their built in Industrial and one at leat for their domestic level. ABB, Bosch, Invertek, Schneider, Teco and Siemens all have links or screws to remove the filters.

Generally if the motor cable is screened 'SY' cable, is less than 10m or so, is correctly installed and permantantly connected to earth without loops and with a good cross section of cable, the leakage is minimised whatever level of filter is resident in the Inverter Drive. This is always necessary to comply with the Manufacturers installation instructions.

[Bob Brown 1Participant @bobbrown1]

This is how I set my inverter up with a filter and have not had an issue with RFI, did have a little interference till I added the filter. Put it in a cabinet to keep the connections covered and away from swarf.

Edited By Bob Brown 1 on 27/04/2016 10:12:19

[MuzzerParticipant @muzzer]

Posted by John Fielding on 27/04/2016 08:24:42:

The Filters have capacitors connected to earth and the small amount of current passing through them may trip your RCD.

Only if one of the capacitors has gone open circuit.

The typical EMC filter has two types of capacitors fitted. One is the Y type which has two capacitors fitted, one from the line terminal to ground and the other from neutral to ground. These caps are the same value so the supply is balanced. The one at the appliance end of the filter is a X type which goes from line to neutral. If all of these caps are working the imbalance on the mains supply is zero.

'Fraid not, John. The neutral connection is at ground potential, so no current is generated by the Y cap on that node. However, the Y cap on the live node generates a small AC current. They don't balance out, otherwise life would be a lot easier for the engineer at EMC time. Ask me how I know.

Y caps are fitted to reduce common mode noise between the AC inputs and ground (X caps are for differential mode ie between L and N) and generally the more Y caps you fit, the lower the CM RFI. Unfortunately, there are low limits on allowable leakage current (typically 3.5mA) otherwise you'd simply fit masses of Y caps.

[Michael GilliganParticipant @michaelgilligan61133]

Paul,

This discussion may be helpful:

**LINK**

… if only to support the theory that you are on a 'wild goose chase'

MichaelG.

Edited By Michael Gilligan on 27/04/2016 10:29:30

[MuzzerParticipant @muzzer]

Posted by Bob Brown 1 on 27/04/2016 10:11:01:

This is how I set my inverter up with a filter and have not had an issue with RFI, did have a little interference till I added the filter. Put it in a cabinet to keep the connections covered and away from swarf.

Edited By Bob Brown 1 on 27/04/2016 10:12:19

That looks like an industrial quality installation, with screened and terminated cables, metallic enclosure and grounded inverter. If only this were the norm!

Inverters are designed to be capable of meeting most "normal" installations by following good practice like this – and have filtering incorporated to get them in the right ball park but every installation is different. However, if you assemble a complete cabinet as a standard product (for sale etc), you would be expected to make it meet the EMC requirements at the cabinet level.

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