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Phone：+86 17062388866Description
The RELIANCE ELECTRIC S-D4012 is a high-capacity 400V AC variable frequency drive engineered for heavy-duty industrial motor control applications. As the flagship model in Reliance Electric’s FlexPak® 3000 series – now part of Rockwell Automation’s PowerFlex® legacy portfolio – this drive delivers robust 12A output current (18.5 kW/25 HP) with advanced sensorless vector control for precise ±0.1% speed regulation. The S-D4012 features adaptive current-limiting algorithms and 200% starting torque capability, enabling reliable control of high-inertia loads like rock crushers, large compressors, and extruder systems. Its modular architecture supports integrated DC bus chokes for harmonic suppression (<30>S-D4012 ensures operational stability in cement production, mining operations, and heavy manufacturing environments while optimizing energy efficiency through automatic slip compensation.
RELIANCE ELECTRIC S-D4012
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | S-D4012 |
| Manufacturer | RELIANCE ELECTRIC (Rockwell Automation) |
| Product Type | AC Variable Frequency Drive |
| Output Current | 12A |
| Output Power | 18.5 kW (25 HP) @ 400V AC |
| Input Voltage | 380-480V AC ±10%, 3-phase |
| Control Method | Sensorless Vector Control (SVC) |
| Overload Capacity | 150% for 60 sec, 250% for 3 sec |
| Switching Frequency | 2-16 kHz (programmable) |
| Braking Torque | 30% (standard), 200% with DB resistor |
| Communication | RS-485 (standard), 2 expansion slots |
| Enclosure Rating | NEMA 1 / IP20 |
| Operating Temperature | -10°C to +50°C (derated above 40°C) |
| Dimensions | 280 x 340 x 270 mm (HxWxD) |
| Certifications | CE, UL, cULus, IEC 61800-3 |
Main Features and Advantages
High-Torque Performance: Advanced current vector algorithms in the S-D4012 deliver 200% starting torque at 0.5 Hz for crushers and ball mills, with automatic slip compensation maintaining ±0.1% speed accuracy during load fluctuations.
Active Harmonic Mitigation: Integrated DC bus reactors reduce input current THDi to<30>Intelligent Thermal Management: Dual cooling fans with speed-controlled operation and I²t motor protection prevent overheating during continuous overload conditions in foundry applications.
Expanded Connectivity: Dual card slots support simultaneous EtherNet/IP and DeviceNet communication for real-time data exchange with FactoryTalk® SCADA systems.
Advanced Diagnostics: 5-line LCD displays waveform capture, power analytics (kWh, VAr), and sequence-of-events recording for rapid fault analysis in process interruptions.
Application Field
The S-D4012 dominates torque-intensive industrial applications:
Mining & Aggregates: Control of jaw crusher motors and overland conveyors with anti-jam detection
Chemical Processing: Large reactor agitator speed regulation with explosion-proof motor compatibility
Power Generation: ID/FD fan control in boiler plants with PID loop optimization
Rubber Manufacturing: Banbury mixer drives requiring constant torque during material compounding
Water Infrastructure: Raw sewage pump control with clog detection and automatic reversal
Marine Heavy Industry: Shipyard crane hoist control with dynamic braking for load positioning
RELIANCE ELECTRIC S-D4012
Related Products
S-D4010: 10A/15kW drive for mid-range applications
S-D4015: 15A/22kW next-step model
20-COMM-E: EtherNet/IP communication module
PowerFlex 755TL: Modern regenerative drive upgrade path
1326AB-B7125E-21: Reliance Severe Duty motor (25 HP)
HIM-H6: High-resolution graphical interface module
S-D4012-HC: Hazardous area version (Class I Div 2)
Installation and Maintenance
Pre-installation preparation: Install input line reactors when utility short-circuit capacity >50kA. Maintain 300mm vertical clearance for convection cooling. Use symmetrical shielded motor cables<50m>Maintenance recommendations: Quarterly measure DC bus capacitor ESR values. Annually clean PCB assemblies with non-conductive cleaner. Verify IGBT gate driver voltages every 18 months. Replace cooling fans at 50,000 hours; monitor bearing noise monthly. Perform dielectric tests after major power disturbances.
