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.
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