VLT ® 2000 Series How to install your VLT I Mechanical installation The VLT 2000 Series is cooled by natural convection. Therefore air must be able to pass freely under and over the unit. The frequency converter must be mounted on a flat vertical surface. This will ensure that the air flow follows the heat reduction. To enable the frequency converter to get rid of the cooling air, you must allow free air space both above and below the frequency converter. The ambient temperature must not exceed 40°C so that the VLT frequency converter can dispose of its power loss. I Prefuses Prefuses must be installed in the supply feeding the frequency converter.
The correct sizes and ratings can be found in the Technical Data section. I What cables to use Cables for the control signals and the brake cable must be screened in order to comply with EMC specifications. The maximum cable length and the maximum cable cross section is specified under Technical Data. Any motor cable screening is connected to the screen termination bracket in the frequency converter (bottom) and the motor. If non-screened cables are used, the control inputs can occasionally be subject to signal disturbances. Normally such a disturbance will not affect the frequency converter. I For the North American market CAUTION:
It is the responsibility of the user or person installing the drive to provide proper grounding and branch circuit protection for incoming power and motor overload according to National Electrical Codes (NEC) and local codes. Enclosure IP 20 *) A 100 mm *) The unit is for panel mounting. It should be placed so that it is easily accessible according to Pr EN 50178 The Electronic Thermal Relay (ETR) in UL listed VLT's provides class 20 motor overload protection in accordance with NEC in single motor applications, when parameter 315 is set to Trip [2] and parameter 107 is set to nominal motor (nameplate) current.
I Side by side mounting The VLT frequency converters can be installed side by side. There is no need for any space for convection along the side of the enclosure. I High voltage test You can perform a 2.5 kV DC test for 1 second after short-circuiting terminals U, V, W, L 1 , L 2 and L 3 . Testing is according to the unit’s chassis. It is important to ensure that the filter capacitors have been discharged after the test. I Extra protection As extra protection, error voltage relays or neutral grounding can be used. However, the installation must comply with local health and safety standards. A ground fault can introduce a direct current in the discharge current.
Terminal 95 (earthscrew) intended for reinforced earthing. Any RCD-relays used must comply with local regulations.The relays must be suitable to protect three-phase equipment with bridge rectifier and short discharge on power-up. 44 MG.20.B6.02 – VLT is a registered Danfoss trademark