Load reactors (i.e. output reactors) are installed between the VFD and motor to protect the motor. Load reactors increase the load inductance and reduce the effect of reflected waves due to PWM waveforms. Load reactors are used to protect the motor when long cables between the VFD and motor are required. If a load reactor is use, it should be located as close to the VFD as possible.
The VFD generates a high frequency (e.g. 4-16kHz) PWM voltage output due to the IGBT switching. The output voltage rise time is fast, usually less than a few microseconds. These short rise times combined with long cables between the VFD and motor can produce voltage reflections, also called ‘reflected or standing waves which have high peak voltages. The resulting voltage can exceed the motor’s peak voltage rating and insulation breakdown can occur.
Available in ratings 2-1000A, higher ratings in request. Voltages from 380V to 690V, 50/60Hz. IP00 to IP20 with enclosed filters to IP54 on request.
Standard range is 2-1000A, with higher rating in request. 380-690V, 50/60Hz. IP00-IP20 and custom enclosures available.
Load reactors should be located as near the motor as possible
IP00, 320A load reactor
Brochure with specifications
Load reactor brochure click above
Sentinel Power Quality has the knowledge and experience
When applied correctly, filters are an important tool in the harmonic mitigation toolbox. However, no form of mitigation is perfect. The secret of success is recognising the pros and cons of all types of active and passive mitigation and being able to apply the most appropriate form of mitigation for any given application.
The engineers at Sentinel Power Quality have been involved in applying active and series passive filters since 2003 to standard and demanding applications.
Contact us with your application details and let us assist you.