Product category:
Motors and Variable speed drives
News Release from: Vacon | Subject: Thermistor input from motor
Edited by the Processingtalk Editorial
Team on 06 September 2006
ATEX-certified thermistor input for VSD
The AC drives manufacturer Vacon has developed an ATEX-certified thermistor input which is fully integrated into the drive, for monitoring motor temperature in potentially hazardous areas
The AC drives manufacturer Vacon has developed an ATEX-certified thermistor input which is fully integrated in the drive Certified and compliant with ATEX 94/9/EC, the integrated thermistor input is specially designed for the temperature supervision of motors that are placed in potentially hazardous areas
This article was originally published on Processingtalk on 27 Oct 2005 at 8.00am (UK)
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In contrast to a typical system with a separate thermistor relay and contactor, a thermistor input can be fully integrated in the Vacon NXP drive.
This unique feature simplifies the use of drives together with Ex motors, i.e motors that are designed and certified for use in potentially explosive environments.
If an over-temperature is detected, the drive immediately stops feeding energy to the motor and thus further heating of the motor is avoided.
As no external components are needed, the cabling is kept to a minimum.
This improves reliability and saves both space and costs.
"As usual, designing an ATEX-certified thermistor input started from a customer need," says Mr Heikki Hiltunen, Executive Vice President, Vacon.
Explosive atmospheres where supervision of motor temperatures is required are widely found in the chemical, petrochemical, marine, metal, mechanical woodworking, mining and oil drilling industries.
The thermistor input is available for the Vacon NXP drives in the power range of 0.75 kW - 5 MW in voltages 380-500V and 525-690V.
This function is now certified to comply with ATEX requirements.
"However, the drives as such cannot be placed in a hazardous area," emphasises Mr Hiltunen.
The ATEX directive 94/9/EC is about equipment and protective systems, intended to be used in potentially explosive environments.
Named after the French words "ATmosphere EXplosible", the directive requires that all electrical and electronic devices installed in potentially explosive environments meet stringent and identical standards throughout the European Union.
The environment can be potentially explosive due to gas or dust.
Vacon Group was founded in 1993 for one purpose only: to create, develop and provide AC drives worldwide.
Our ambition is to meet the most demanding needs of customers looking for the ultimate in performance, ease of use and reliability.
Vacon offers AC drives in the power range of 0.25 kW to 5 MW.
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