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 in the power range of 0.75 kW5 MW in voltages 380500 V and 525690 V.
|
ATEX-certified thermistor input integrated in the ac drive
The ac drives manufacturer Vacon has developed an ATEX-certified thermistor input which is fully integrated in the drive. Certified and compliant with the European ATEX directive 94/9/EC, the integrated thermistor input is specially designed for the temperature supervision of motors that are placed in potentially hazardous areas. However, the drives as such cannot be placed in a hazardous area. This feature simplifies the use of drives together with Ex motors, ie motors that are designed and certified for use in potentially explosive environments. If 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. 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. Vacon Plc is based in Vaasa, Finland. www.vacon.com |
