Eaton S801+T18N3S

The Eaton S801+ series is a reduced-voltage soft starter designed for three-phase motors. The T18N3S is a typical model with 180 A current rating and T-type frame. By softly switching the motor voltage during start-up and stop processes, the product achieves smooth acceleration/deceleration, reduces mechanical and current shocks, and enhances system reliability and service life.

Main Technical Parameters

• Rated Current: 180 A (optional 11 A – 1000 A)
• Operating Voltage: 200 V – 600 V AC, 24 V DC auxiliary power supply
• Frequency Range: 47 Hz – 63 Hz
• Frame Size: T-type (approximately 12.5 inches in height, 19 inches in length/depth, 14.5 inches in width), weight about 45 lbs
• Number of Poles: Three poles (suitable for three-phase motors)
• Display Mode: LCD touch/key display
• Communication Interface: Modbus RTU (other fieldbuses optional)
• Certifications: CE, IEC 947, EN 60947-4-2, CSA, etc.
• Environmental Adaptability: Operating temperature -30 °C to +50 °C, NEMA 0 protection class
• Wiring Specification: #5 AWG – 500 kcmil (for 180 A)

Product Features

• Compact Size & Flexible Installation: Adopts a compact T-type frame, which can directly replace traditional contactors or wye-delta starters, suitable for installation inside cabinets or enclosed control boxes.
• Built-in Overload and Bypass Contactors: Enables fast start/stop and provides basic motor protection functions.
• Pump Control Option: Equipped with soft stop function to eliminate water hammer effect, especially suitable for pump applications.
• Multi-range Current Options: Ranging from 11 A to 1000 A, covering the needs of small to large industrial motors.
• Programmable Acceleration/Deceleration Curves: Achieves optimal starting characteristics for different loads through built-in parameter settings.
• Fieldbus Compatibility: Modbus RTU facilitates integration with upper-level systems, enabling remote monitoring and diagnosis.

Structure and Composition

• Power Supply Module: 24 V DC auxiliary power supply, providing power for the control circuit.
• Power Module: Includes thyristor/IGBT switch array to realize soft voltage switching.
• Control and Display Unit: LCD/keyboard or touch panel for parameter setting and status display.
• Communication Unit: Modbus RTU interface and optional fieldbus modules.
• Overload and Bypass Contactors: Built-in thermal relay and mechanical bypass for protection and fast switching.
• Terminal Blocks: Input, output, control and communication terminals complying with IEC/EN standards.

Typical Application Fields

• Pump Stations and Water Treatment: Soft stop prevents water hammer and extends pipeline service life.
• Fans and Compressors: Reduces start-up current shock and prolongs the service life of mechanical components.
• Mining and Metallurgy: Smooth start-up and shutdown of high-power three-phase motors.
• Papermaking, Textile, and Food Processing: Motors for production lines requiring frequent start-stop operations.
• Building Facilities: Motor control for air conditioning, ventilation systems, etc.

Installation Key Points

• Model Matching: Confirm that the motor’s rated current and supply voltage are consistent with the parameters of the S801+ T18N3S.
• Wiring Layout: Use cables that meet specifications (#5 AWG – 500 kcmil), ensure correct phase sequence and reliable grounding.
• Power Supply: Provide a stable 24 V DC auxiliary power supply to avoid voltage fluctuations affecting the control circuit.
• Heat Dissipation and Ventilation: Install in a well-ventilated cabinet to maintain the operating temperature within the specified range.
• Communication Wiring: If using Modbus RTU, configure the correct baud rate, address, and terminal resistor.
• Commissioning Steps: First perform no-load testing to check the start-up voltage curve and current waveform, then connect the load for full-load verification.

Maintenance

• Regular Inspection: Check wiring tightness, terminal corrosion, and heat sink cleanliness every 6 months.
• Firmware Upgrade: Obtain the latest firmware through the Modbus interface to improve functionality and compatibility.
• Fault Diagnosis: Use fault codes displayed on the LCD or alarm information from the upper-level system to quickly locate overload, short circuit, or communication abnormalities.
• Spare Parts Management: Keep overload relays, bypass contactors, and power modules in stock for quick replacement.
• Environmental Monitoring: Ensure the operating environment temperature and humidity are within the rated range to prevent component aging caused by extreme conditions.

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