Description

The RELIANCE ELECTRIC S-D4008 is an industrial-grade 400V AC variable frequency drive engineered for demanding motor control applications requiring robust performance and precision. As part of Reliance Electric’s FlexPak® 3000 series – now under Rockwell Automation’s PowerFlex® legacy portfolio – this drive delivers 8A output current (11 kW/15 HP) with advanced sensorless vector control for ±0.1% speed regulation accuracy. The S-D4008 features adaptive acceleration/deceleration profiles and automatic torque compensation, enabling smooth operation of high-inertia loads like crushers, mixers, and extruders. Its modular design supports integrated dynamic braking and optional communication cards (EtherNet/IP, Profibus DP) for seamless integration with Allen-Bradley PLCs. With NEMA 1/IP20 protection and patented DC bus stabilization technology, the RELIANCE ELECTRIC S-D4008 ensures reliable operation in cement plants, mining conveyors, and heavy manufacturing facilities while reducing energy consumption by up to 40% compared to fixed-speed systems.

RELIANCE ELECTRIC S-D4008

Technical Specifications

Main Features and Advantages

High-Performance Motor Control: Adaptive flux vector algorithms in the S-D4008 maintain torque accuracy within 3% from 0.1–300 Hz, enabling precise speed synchronization for multi-motor conveyor systems.
Intelligent Energy Management: Automatic load detection adjusts V/f curves in real-time, reducing power consumption during partial-load operation. Regenerative braking capability feeds energy back to the grid.
Robust Protection Suite: Integrated I²t thermal monitoring protects motors from overloads, while phase-loss detection and DC bus overvoltage control prevent catastrophic failures.
Advanced Connectivity: Supports 20-COMM-E EtherNet/IP cards for real-time control via Studio 5000®. DriveTools™ SP software enables fleet-wide parameter management.
Enhanced Diagnostics: 5-segment LED status indicators and fault code logging (last 15 events) simplify troubleshooting. Real-time power analytics (kWh, PF) optimize energy audits.

Application Field

The S-D4008 excels in heavy industrial torque-critical applications:

Mining: Control of crusher motors and overland conveyor drives with shock-load compensation

Plastics Processing: Extruder screw speed regulation maintaining constant melt pressure

Wastewater Management: Progressive cavity pump control with dry-run prevention logic

Metals Industry: Rolling mill auxiliary drives requiring torque matching during coil changes

Aggregate Processing: Vibrating screen motor synchronization for material classification

Marine: Ventilation fan control in ship engine rooms with salt-spray resistance

Related Products

S-D4007: 7A/5.5kW predecessor model

S-D4010: 10A/18.5kW next-step drive

20-COMM-D: DeviceNet communication module

PowerFlex 755TR: Modern regenerative drive upgrade path

1326AB-B740E-21: Reliance Severe Duty motor (15 HP)

HIM-G6K: Advanced keypad with waveform capture

S-D4008-EP: Enhanced protection version for dusty environments

RELIANCE ELECTRIC S-D4008

Installation and Maintenance

Pre-installation preparation: Install input line reactors when supply impedance<3>Maintenance recommendations: Quarterly measure DC bus ripple (<20v annually="" clean="" air="" channels="" with="" dry="" nitrogen="" blast.="" check="" igbt="" thermal="" paste="" integrity="" every="" years.="" monitor="" electrolytic="" capacitor="" esr="" replace="" if="">2x initial rating.<!--20v-->