Gingoog Electric Trading (G.E.T.) ™

October 10, 2009

Danfoss VLT-2800 highlights

Filed under: GET VLT-2800 series — Ralf @ 12:43 AM

Danfoss VLT-2800 special features

Dry run detection

New features improve pump operations significantly and result in improved energy savings as well as pump protection in case of dry run conditions.

Other important features are

Automatic or manual restart after shutdown

Programmable restart delay up to one hour

Shut down at low or no flow

Operates in either open or closed loop applications

Flexible mounting

VLT-2800 is designed for flexible mountings. A ventilated heatsink allows for side by side mounting and even horizontal mountings.

User friendly

Entering motor data in the Quick Menu via the local Control Panel is all you need to be up and running.

Enhanced sleep mode

When using pumps with flat pump curves or when the suction pressure varies, this feature provides excellent control for shutting down the pump at low flow, thus resulting into more energy savings.

Important features here are

Automatic restart after shut down based on pressure

Boost function to increase pressure for a certain period after shut down

Operates also in a closed loop

Pipe fill mode to prevent water or liquid hammering

Single phase input feature

VLT-2800 can provide also a three phase power from a single phase line outlet

When a VLT-2800 single phase is used it is just like getting three phase power from a standard power socket.

This feature is especially meant for pumps, fans and blowers, etc… available now up to 3.7KW/5.00HP

Built in wobble function

The wobble function is used for example for the traverse function on a textile winder.

VLT-2800 operates in this application a motor which turns a grooved drum. During winding the grooved drum places the thread in the correct position on the bobbin in a diamond pattern.

If the traversed (grooved) drum was operating at a constant speed, the thread would tend t o cross at the same position for each pass which would give a very loose and less compact winding on the bobbin.

Precise stop

Conventional units rely on a periodic scan of the digital inputs which initiates the stop command.

This can result into uneven delays while the Drive scans all the other parts of the program, taking up to perhaps 10 milliseconds and this is a disadvantage in typical packaging and/or other applications.

For a conveyor operating at a speed of 1 meter per second, that gives a deviation of +/- 10mm.

In the VLT-2800, the stop command is an interrupt, rather than part of the scan.

The repeating precision is improved, the deviation is only +/- 1mm in the example used above.

Counter precise stop

After the start signal is received, the VLT-2800 operates until the user programmed number of pulses is seen at terminal 33. A stop signal is generated and the normal stop ramp is used.

The counter stop signal is then re-armed and ready again for a new start command.

The pulse input is designed to handle 24V push-pull pulses from an encoder with up to 1024ppr.

The maximum pulse rate is 67,600Hz.

Please find also much much more on the general Drive subject in the

GET Drives Category

GET Savings Category

GET Applications Category

GET to know VFD’s Category

It is precisely there where you will find much more information to the general subject plus much more specific referrals to very much related downloads. When you prefer to view directly all the corresponding file folders you may also proceed directly to our

GET Sky Drive Section

We certainly do hope that you enjoyed again the read and that you stay with us for more upcoming technical reading pleasure.

Retrieve our GET Contact Details or send us your E-mail inquiry through the GET Contact Form.

Ralf Wabersich

Gingoog Electric Trading (G.E.T.)


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