Product Details

The RELIANCE 518315 current voltage transductor board is a discontinued signal sampling and conversion PCB for Reliance Electric legacy analog SCR DC drive systems, widely applied in metallurgy, papermaking, rolling mill and other heavy-duty continuous production lines. It cooperates with regulator control boards and power interface boards, collecting armature current, shunt current and armature voltage signals from the power rectifier section, converting high-power raw signals into low-level standard analog feedback signals for the speed and current closed-loop regulator.

This board adopts isolated transformer transductor and precision operational amplifier circuit design. It isolates high-voltage power side signals from low-voltage control circuits, converts current and voltage values into proportional analog feedback signals for the control loop. It reserves multiple range tap points for signal range matching according to different drive power ratings. It integrates surge absorption and noise filtering components to suppress spike interference generated by SCR commutation. It can provide stable current limit and voltage feedback basis for overload protection, overvoltage alarm and field loss detection of the drive. It is a dedicated feedback sampling board for Reliance old analog DC drive platform, cannot be directly replaced by other boards without tap setting, signal polarity confirmation and feedback calibration. Multiple transductor boards can be configured for multi-drive independent sampling.

It adopts rack plug-in installation structure with gold-plated edge connector and front terminal block for shunt, power and signal wiring. The PCB layout adopts reinforced insulation and anti-common-mode interference design, adapting to harsh industrial sites with large current switching noise and mechanical vibration. Users need to confirm matched drive power stack, shunt specification and signal wiring definition before replacement. This legacy RELIANCE 518315 board is mainly used for maintenance and retrofit of old Reliance DC drive systems. Isolation test, signal ratio calibration and closed-loop linkage test are required after installation. A conformal coated version is optional for high humidity and dusty industrial sites. This transductor board is widely used in Reliance legacy DC drive renovation, power section signal acquisition and heavy-duty motor closed-loop speed regulation systems.

This current voltage transductor board obtains working power from the drive internal auxiliary power supply. The edge connector and terminal block support quick disassembly and replacement for convenient on-site maintenance and inspection. The optimal operating temperature range is 0°C to 55°C, storage temperature ranges from -40°C to +85°C, relative humidity 5% to 85% non-condensing. It complies with industrial shock, vibration and EMC standards and has CE certifications. It supports parameter backup for fast recovery after hardware replacement.

This RELIANCE 518315 transductor board is widely applied in Reliance legacy DC drive control systems. It undertakes high-power current and voltage signal isolation, sampling and conversion. As a reliable spare part for Reliance legacy drive systems, the 518315 retains original signal conversion accuracy and isolation performance, helping customers reduce maintenance cost of old industrial automation equipment.