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dV Sentry™ FAQs


How do I size the filter?
The filter should match the drive/motor voltage and current ratings.  If an exact current rating is not available, go to the next largest rating.

Does the Carrier Frequency Matter?
Yes.  Heat loss increases with an increased carrier frequency.  Lower carrier frequencies reduce motor voltage stress, and drive temperature.

Do I mount the filter near the drive or the motor?
The filter should be mounted as close to the output of the VFD as possible.  This method helps to protect the motor as well as the motor leads.

What is the warranty for the dV Sentry Filter?
MTE warrants the dV Sentry for a period of three years from the date of shipment.

What does Panel (Part number DVSPxxxxE) mean?
Panel unit ship complete with all filter components necessary except customer supplied wire.

What types of enclosures can I get with the filter?
The dV Sentry is available in two types of enclosures.  NEMA 1/2 (Part number DVSGxxxxE) and NEMA 3R White (Part number DVSWxxxxE).

What is the Maximum lead length I can run?
The motor lead length can be up to 1,000 feet.  Beyond 1,000 feet, use a SineWave Guardian®.

What operating voltages is the filter designed for?
The filter is designed to operate between 380V to 600V, 0-90Hz.  Derating applies above 90Hz (see chart).

Is there an over temperature switch?
Yes.  There is a 150°C normally closed temperature switch.  It is highly recommended this switch be used to prevent damage to the filter in the rare instance of overheating from unintended conditions.

The dV Sentry is new. Is it UL listed?
The dV Sentry is UL/cUL Listed and CE marked.    

What is the heat loss from the filter?
The overall filter efficiency is greater than 98%.  Heat loss will vary with carrier frequency, motor lead length and cable type.

Can I run more than one motor on the filter?
No.  For paralleling motors, use SineWave Guardian.

What is the continuous current and overload rating?
The filter is rated for 100% continuous current, 150% current for up to 1 minute, and 200% current for 10 seconds.