Product Details

The RELIANCE 543391 auxiliary power supply board is a discontinued internal power conversion circuit board for Reliance Electric legacy analog SCR DC drive systems, widely used in metallurgy, papermaking, rolling mill and other heavy-duty continuous production lines. It converts AC auxiliary input from the drive power section into multiple stable low-voltage DC power supplies, providing working power for regulator boards, feedback transductor boards, gate drive boards, interlock I/O boards and other control PCBs inside the drive unit.

This board adopts step-down rectification, filtering and voltage stabilization circuit design. It outputs multi-channel isolated DC voltage for analog operational amplifier circuits, logic circuits and relay drive circuits. It integrates overvoltage, overcurrent and short-circuit protection circuits. When the load circuit is shorted or abnormal, it can lock the output and send fault alarm signal to the interlock board to avoid damage to downstream control boards. It is equipped with surge absorption and EMI filtering components to suppress power grid noise and SCR commutation interference, and improve the stability of the whole analog control loop. It is a dedicated auxiliary power accessory for Reliance old DC drive platform, cannot be directly replaced by other boards without matching voltage specification, load current rating and wiring definition. Multiple power boards can be configured for multi-drive independent power supply.

It adopts rack plug-in installation structure with gold-plated edge connector and front terminal blocks for AC input and multi-channel DC power output wiring. The PCB layout adopts anti-vibration and thermal dissipation design, adapting to harsh industrial sites with mechanical vibration and high ambient temperature. Users need to confirm matched drive series and downstream control board power demand before replacement. This legacy RELIANCE 543391 board is mainly used for maintenance and retrofit of old Reliance DC drive systems. Output voltage accuracy test, load test and protection function verification are required after installation. A conformal coated version is optional for high humidity and dusty industrial sites. This auxiliary power supply board is widely used in Reliance legacy DC drive renovation, internal control power supply and stable operation of analog closed-loop control system.

This auxiliary power supply board obtains input power from the drive internal AC auxiliary winding. 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 543391 auxiliary power supply board is widely applied in Reliance legacy DC drive control systems. It undertakes multi-channel isolated DC power conversion and fault protection for all internal control boards. As a reliable spare part for Reliance legacy drive systems, the 543391 retains original voltage stabilization accuracy and load protection performance, helping customers reduce maintenance cost of old industrial automation equipment.