Product Short Description
Product Name: MOVITRAC 31C Series Frequency Inverter / Variable Frequency Drive (VFD)
Product Introduction: A microprocessor-controlled, general-purpose three-phase AC drive from SEW-EURODRIVE’s MOVITRAC 31C family. It uses sinusoidal PWM modulation to control three-phase induction motors, providing variable speed and torque control for a wide range of industrial machinery.
Description
Technical Specifications:
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Input voltage: 3 × 380 / 400 / 415 / 460 / 480 / 500 VAC
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Input current: 3.5 A
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Output power: 2.8 kVA
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Output current: 4.0 A
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Output frequency range: 0–400 Hz (adjustable knee frequency between 50 Hz and 120 Hz)
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Typical motor power rating: 1.5 kW
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Control method: V/f (VFC) control and sensorless vector control
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Dimensions (H × W × D): 281 × 184 × 170 mm
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Weight: 4.5 kg
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Protection class: IP20 (cabinet mounting)
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Cooling: Forced air cooling
Functional Features:
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Sinusoidal PWM modulation for smooth motor operation.
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Constant torque below the adjustable knee frequency; constant power above it, with automatic current limit reduction to prevent motor stalling.
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All electronic inputs/outputs are electrically isolated from the power supply.
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Switch-mode power supply operates independently of input frequency.
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Expandable with optional communication cards (e.g., Profibus, Modbus).
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Integrated brake chopper (four-quadrant operation typical).
Application Scenarios: General machinery, conveyor systems, fans, pumps, textile machines, packaging lines, and material handling.
Working Principle: The inverter rectifies the incoming three-phase AC to DC, then uses IGBTs to synthesize a variable-frequency, variable-voltage three-phase output via sinusoidal PWM. The control electronics regulate the V/f ratio (or perform sensorless vector control) to maintain constant motor flux and deliver the desired speed/torque.
Installation Requirements:
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Install inside a control cabinet (IP20 rated, not for direct outdoor or dusty/wet exposure).
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Provide adequate ventilation and respect the derating for ambient temperature.
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Connect the three-phase AC input and motor output terminals per SEW wiring diagrams.
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Optionally insert communication option cards.
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Ensure proper grounding and ferrite chokes on motor cables if required.
Usage Precautions:
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Do not operate beyond the rated input voltage and current.
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Respect the maximum output frequency setting to avoid mechanical overspeed.
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Motor cable length must be within limits specified by SEW to avoid insulation stress.
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This product is discontinued; when replacing, verify compatibility with the existing motor and control system.
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