MTE SineWave Guardian SWGM0002D

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The MTE SineWave Guardian is a motor protection filter designed to transform the output of Variable Frequency Drives (VFDs) to a near-perfect sinusoidal waveform. This device aims to provide the best level of motor protection by eliminating motor insulation failures and reducing electromagnetic interference (EMI) caused by the high dV/dt associated with inverter output waveforms. MTE's unique, patent-pending design offers high performance, a smaller size, and better efficiency compared to traditional LC filters.

Function Description:

The SineWave Guardian operates by taking the PWM (Pulse Width Modulation) output from a VFD and smoothing it into a clean, sinusoidal waveform. This process is crucial for protecting motors, especially those with longer lead lengths, from the damaging effects of high voltage spikes and rapid voltage changes (dV/dt) that are inherent in VFD outputs. By providing a sine wave output, the filter helps prevent premature motor insulation breakdown, reduces motor heating, and minimizes audible motor noise. It also mitigates EMI, which can interfere with other sensitive electronic equipment. The filter is designed for conventional 3-phase motors operating in Volts per Hertz mode and can also be used for inverters feeding isolation transformers.

Important Technical Specifications:

Voltage: Input voltage from 380V – 480V, with a tolerance of +/- 10%.
Input Voltage Wave Form: PWM.
Harmonic Voltage Distortion: 5% maximum @ 2kHz.
Inverter Switching Frequency: Supports carrier frequencies from 2kHz to 8kHz.
Inverter Operating Frequency: Supports 6Hz to 75Hz without derating, and >75Hz to 120Hz with derating (refer to Figure 5-4: Motor Frequency Derating curve).
Current Range: Available for applications from 2 Amps to 720 Amps.
Efficiency: Greater than 98% (typical values provided in Table 5-1: Filter Efficiency & Watt Loss, ranging from 98.0% to 99.7% depending on current rating).
Insertion Loss (Voltage): 6% maximum @ 60Hz.
Maximum Ambient Temperature:
- Modular Filter: -40°C to +60°C.
- Enclosed Filter: -40°C to +55°C.
Storage Temperature: -40°C to +90°C.
Altitude without Derating: 3,300 feet above sea level (refer to Figure 5-3: Attitude Derating Curve for derating factors at higher altitudes).
Maximum Motor Lead Length: 15,000 feet.
Relative Humidity: 0% to 95% non-condensing.
Current Rating: 100% RMS Continuous, with 150% for 1 minute Intermittent.
Audible Noise: 75dB A at 1 meter.
Agency Approvals: UL and cUL listed to UL508 Type MX and CSA-C22.2 No 14-95 (File E180243).

Usage Features:

Form Factors: Available in three mechanical configurations:
- Modular: Designed for integration into existing enclosures or custom setups.
- NEMA 1/2 (General Purpose): Enclosed for indoor use, providing protection against contact with enclosed equipment and limited amounts of falling water and dirt. Corresponds to IEC IP20.
- NEMA 3R (Weather): Enclosed for outdoor use, providing protection against contact with enclosed equipment, falling rain, sleet, and external ice formation. Corresponds to IEC IP21.
Selection Guide: A comprehensive guide (Section 3) helps users select the appropriate filter based on voltage, current rating, switching frequency, drive output frequency, temperature, altitude, and enclosure type. Detailed part number selection tables are provided for modular, NEMA 1/2, and NEMA 3R configurations, including physical dimensions and weight.
Interconnection Diagrams: Clear diagrams are provided for modular (Figure 6-1) and enclosed (Figure 6-2) units, illustrating connections to the disconnect switch, drive, motor, and optional system controller. An isolation transformer diagram (Figure 6-4) is also included for specific applications.
Over Temperature Switch: An integrated Normally Closed (NC) switch opens at 180°C +/- 5°C. MTE highly recommends using this switch to prevent damage from abnormal operating conditions. Contact load ratings for the switch are provided for various AC and DC voltages and load types (resistive/inductive).
Drive Compatibility: The filter is compatible with drives that can be configured to Volts per Hertz mode. Users must consult their drive manual to configure proper parameters.
Motor Ramp Time: MTE recommends 10 seconds as an initial starting point for motor ramp time, advising customers to examine the actual inrush and ratings of their drive system. Inrush current seen at the drive from the filter can be overcome by changing the motor ramp time.

Maintenance Features:

Installation Checklist: A checklist (Section 6) guides users through the installation process, emphasizing safety precautions, proper wiring, and grounding.
Grounding: The filter must always be grounded with a grounding conductor connected to ground terminals. For modular units, a 2" x 2" area on the lower mounting bracket must be cleaned of paint and varnish for a proper ground connection.
Capacitor Discharge: After removing power, users must wait at least five minutes to allow capacitors to discharge to a safe level. Verification with a DC voltmeter across the capacitor terminals is required before contact.
Moisture Check: Before startup, ensure that moisture has not condensed on filter components. If present, do not proceed until the moisture is removed.
Troubleshooting Guide: A detailed troubleshooting guide (Section 8, Table 8-1) helps diagnose common issues such as drive overcurrent fault, excessive filter noise, temperature switch open, motor not turning, and motor running hot. Possible causes and solutions are provided for each problem.
Repair/Exchange Procedure: MTE Corporation requires a Return Material Authorization Number and form for returns or repairs. Contact information for support is provided.
Warranty: The product comes with a three-year warranty from the date of shipment. Details are available on the MTE website.
Documentation: The manual includes reference drawings (Section 4) for detailed component layouts and wiring.