TCI MotorShield Sinewave Output Filter Catalog Page

Motor Protection

MotorShield Sinewave Output Filter

As Pulse Width Modulated (PWM) Drives are
incorporated into various applications and processes, the
increased energy savings and decreased maintenance on
drives can be offset by increases in motor failures.

High voltage spikes caused by a phenomenon known as

reected 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 reected back in the direction from
which it arrived. As these reected waves encounter

other waves, their values add, causing higher peak voltage.

Peak voltages on a 480V system can reach 1,600V. These
high peak voltages will cause a rapid breakdown of motor
insulation, leading to motor failure.

TCI’s MotorShieldTM improves system performance
by protecting the motor from the harmful effects of

reected waves and preventing motor failure associated

with insulation failure, overheating, and noise.

Industry Application: Fans & Pumps

The MotorShield is designed to extend motor life in
variable torque applications such as fans and pumps
with lead lengths up to 15,000 feet. Motors on these
systems typically produce a large amount of heat as they
run. The MotorShield is the perfect solution to prevent
overheating and motor failure.

Typical Applications

• Wastewater Treatment Plants

• Mining

• Material Handling

• Oil & Gas

• HVAC Systems

• Chemical Processing

• Power Plants

• Data Centers

• Renewable Energy

• Pulp & Paper

Motor Input Waveform Without MotorShield

1500

1000

500

0

Volts

-500

-1000

-1500
0 403530252015105

Time (ms)

Motor Input Waveform With MotorShield

1500

1000

500

0

Volts

-500

-1000

-1500
0 403530252015105

Time (ms)

MSD 0110A3 0 0

MSD Part Numbering System

3 = Type 1 / 3R

Current Rating

Voltage Rating

A = 480

Enclosure

00 = Default

Options

480V = 9, 12, 16, 23, 30, 35, 45, 55, 65,

80, 110, 130, 160, 200, 250, 305

Technical Specications

Current Ratings

Available continuous currents: 9 to 305 amps

Intermittent current: 150% for 1 minute out of every 60 minutes
VFD Output Voltage Up to 480 V, 3-phase, at fundamental base frequency congured to Volts per Hz
VFD Output Frequency Up to 80 Hz
VFD Carrier Frequency 2 kHz to 16 kHz

Filter Performance

Maximum peak voltage of output waveform - 480 V: 1000V

Maximum dv/dt of output waveform - 480 V: 500V/μs

Environmental Conditions

Maximum Elevation 3,300 ft (1,000 m), derating required for operation above this level

Ambient Operating Temperature Range

-40 °C (-40 °F) to 40 °C (104 °F)

Cooling provisions required for operation above this temperature
Ambient Storage Temperature Range -40 °C (-40 °F) to 50 °C (122 °F)
Maximum Humidity, Operating or Storage 95%, non-condensing

Reference Technical Standards

Enclosure Options NEMA 1/3R enclosure
Insertion Impedance 6.5% nominally at 60 Hz & full load current
Capacitors High endurance design (no PCBs)
Warranty One year or 18 months from date of shipment

Block Diagram Test Stand

Extreme Long Lead Applications

VFD

Multiple Motor Applications

MOTO R

VFD

Part Numbering System

MOTO R

MOTO R

MOTO R

VFD

Low Voltage PWM Power Supply to Medium

Voltage Motor

VFD

STEP-UP

XFMR

Performance Guarantee

Properly sized and applied, the addition of
a MotorGuard Sinewave 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 MotorGuard

lter, TCI will take back the output lter and

pay shipping both ways. This offer is valid for 60
days from the installation date.

MOTO R

MOTO R