MSD – Sine Wave Filter

Superior Solutions for Typical Problems

To increase energy savings and decrease maintenance, many industries have begun to incorporate Pulse Width Modulated (PWM) Drives into various applications and processes. However, as the voltage spiking increases, so does the rate of motor failures.

For example, peak voltages on a 480 V system can reach an alarming 1,600 V. These high peak voltages will quickly cause a rapid breakdown of motor insulation, leading to motor failure. Which means that while initially your PWM Drive was saving you energy and maintenance costs, you may now need to replace your entire motor, or more costly sensitive equipment.

Instead, with TCI’s MotorShield in place, your system performance is improved by protecting your motor from the harmful effects of reflected waves, and further preventing motor failure associated with insulation failure, overheating, and audible noise.

Motor Input Waveform without MotorShield
High voltage spikes caused by a phenomenon known as reflected wave (dV/dt) occur when there are long cable runs between the drive and the motor. The impedance on either end of the cable run does not match, causing voltage pulses to be reflected back in the direction from which it arrived. As these reflected waves encounter other waves, their values add, causing higher peak voltage.
Motor Input Waveform with MotorShield
TCI’s MotorShield improves system performance by protecting the motor from the harmful effects of reflected waves and preventing motor failure associated with insulation failure, overheating, and noise.
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Technical Specifications

  • UL and cULus Listed
  • Carrier frequencies from 2 kHz to 16 kHz
  • System Voltage: 480 VAC
  • Operating Temperature Range: -30° C (-22° F) to 40° C (104° F)
  • Storage Temperature Range: -40° C (-40° F) to 50° C (122° F)
  • Distance: up to 15,000 feet
  • Enclosure: General Purpose NEMA 1/3R

Typical Applications

  • Extreme long motor lead lengths – applications can reach 15,000 feet
  • Oil & Gas – down hole pumps and deep well drilling pumps
  • Water & Wastewater – pumps
  • Data Centers
  • HVAC systems – audible noise reduction
  • For Filter Sizing help, Click Here


For Demanding Constant Torque Applications

For demanding constant torque applications, we recommend the MotorGuard Sine Wave Filter. This robust, heavy-duty filter delivers reliable sine wave filter performance where a filter with greater application flexibility and performance is needed.

Performance Guarantee

Properly sized and applied, the addition of a MotorShield Sine Wave Output Filter is guaranteed to bring the application into compliance with NEMA Standards Publication No. MG-1. If the system fails to meet MG-1 standards with the addition of a MotorShield filter, TCI will take back the output filter and pay shipping both ways. This offer is valid for 60 days from installation date.