Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 0-57412-E |
| Manufacturer | Reliance Electric (also supplied via ABB / Baldor Reliance) |
| Product Type | Field Regulator Module / Excitation Control Card |
| System Series | AutoMax PLC / DCS 5000 Distributed Control System |
| Supply Voltage | 24 VDC (powered from rack backplane) |
| Maximum Field Current Output | 10 A |
| Port Isolation | 500 VDC |
| Serial Communication | 3 × RS-232 D-shell ports (two 9-pin, one 25-pin) |
| Supported Protocols | Modbus, AutoMax proprietary protocol |
| Input Signal Types | Isolated armature voltage, field current feedback, external speed reference |
| Calibration | 4-stage current calibration potentiometer on front panel |
| Protection Functions | Overcurrent, overvoltage, field circuit fault detection & lockout |
| Operating Temperature | 0°C to 60°C |
| Protection Rating | IP20 (indoor control cabinet installation) |
| Physical Dimensions | 7.0 cm × 14.5 cm × 29.3 cm |
| Weight | 0.9 – 1.1 kg |
| Certifications | IEC 61131-2, UL 508 |
Main Features and Advantages
The Reliance Electric 0-57412-E delivers exceptional value in industrial excitation control through its precision engineering and rugged AutoMax-compatible architecture.
Precision Closed-Loop Current Regulation: At the heart of the Reliance Electric 0-57412-E lies a closed-loop current regulation capability that samples field current and isolated armature voltage in real time. The module executes high-gain PID control to maintain excitation stability, ensuring that DC motors and generators achieve consistent torque and speed output across varying load conditions. This precision is essential for applications requiring tight process control, such as rolling mills and paper machine drives.
Triple RS-232 Interface Architecture: Unlike generic regulator cards, the Reliance Electric 0-57412-E features three dedicated RS-232 D-shell serial ports arranged for specific functions. The 25-pin port labeled “To Field Gate Connector” interfaces with thyristor gate firing circuits, the first 9-pin port connects to the field power module, and the second 9-pin port receives isolated armature voltage feedback signals. This structured interface design simplifies field wiring and enables systematic troubleshooting.
Superior Electrical Isolation: The Reliance Electric 0-57412-E provides 500 VDC port isolation between control logic and field circuits, delivering robust immunity against electromagnetic interference (EMI). In industrial environments with high electrical noise from motor commutation, welding equipment, or switching operations, this isolation barrier protects sensitive control electronics from voltage transients and ground loop currents, ensuring reliable signal integrity.
Backplane-Powered Efficiency: The Reliance Electric 0-57412-E draws its operating power directly from the AutoMax rack backplane, eliminating the need for an external power supply. This design reduces cabinet wiring complexity and eliminates a potential single point of failure, while the single-slot form factor conserves valuable rack space for additional I/O or control modules.
Legacy System Compatibility: Designed as a core component of the AutoMax platform, the Reliance Electric 0-57412-E maintains full compatibility with existing AutoMax installations. For facilities operating aging but mission-critical drive systems, this module offers a reliable path for maintenance and repair without requiring complete system replacement.
