This website uses cookies primarily for visitor analytics. Certain pages will ask you to fill in contact details to receive additional information. On these pages you have the option of having the site log your details for future visits. Indicating you want the site to remember your details will place a cookie on your device. To view our full cookie policy, please click here. You can also view it at any time by going to our Contact Us page.

New current limiting feature for ignition protection

15 July 2011

Danfoss VLT Drives has introduced a new current limiting feature for its VLT AutomationDrive, which makes it easier to apply “Ex-e” motors instead of the more expensive “Ex-d” motors. The feature ensures that the VLT drive will limit motor current to prevent the motor from overheating. The user simply enters data from the motor nameplate via the drive's control panel, and from this data, the drive creates a “loft” that limits the current provided dependent on motor speed.

The new feature offers more than just an economical and flexible alternative to existing methods. It opens the way to attractive energy savings by increasing the cost effectiveness of speed controlled applications, especially pumps and fans. Features at-a-glance:

Uncomplicated - flexible use of speed control with motors having “Increased Safety” ignition protection

Compact - distinctly smaller frame size, lower weight and lower costs compared with speed control of motors with flame-proof enclosures.

Flexible - easy mix and match, resulting in smaller stocks of motors and converters.

Economical - lower investment costs enable faster payback when speed control is used to achieve energy savings .

Universal  - universal application across the power range of 0.4 to 1,200kW with 400, 500 or 690V supply.

No need for matched pairs - suitable for operation of Ex-d/de and Ex-e motors without the need for matched pairs of motors and drives.

The VLT PTC thermistor card MCB 112 (which handles PTC thermistor monitoring), ensures that motors with Ex e ignition protection are operated in compliance with the provisions of ATEX Directive 94/9/EC.

Contact Details and Archive...

Print this page | E-mail this page