RELIANCE 846680-SR original three-phase thyristor rectifier power stack
846680-SR is Reliance Electric original three-phase thyristor rectifier power stack, belonging to MaxPak Plus & FlexPak series DC drive core power spare part, factory production discontinued, supplied via surplus new stock and professionally refurbished stock only. It integrates thyristor chip group, aluminum cooling radiator, standalone surge resistance component and gate trigger auxiliary PCB as an integrated power assembly, converting three-phase industrial AC into adjustable DC to supply DC motor armature loop. SR suffix stands for revised mechanical structure plus standalone surge resistor configuration, differing from RC version with no built-in capacitance snubber circuit.
Description
1. Product Brief Introduction
846680-SR is Reliance Electric original three-phase thyristor rectifier power stack, belonging to MaxPak Plus & FlexPak series DC drive core power spare part, factory production discontinued, supplied via surplus new stock and professionally refurbished stock only. It integrates thyristor chip group, aluminum cooling radiator, standalone surge resistance component and gate trigger auxiliary PCB as an integrated power assembly, converting three-phase industrial AC into adjustable DC to supply DC motor armature loop. SR suffix stands for revised mechanical structure plus standalone surge resistor configuration, differing from RC version with no built-in capacitance snubber circuit.
2. Model Definition
846680: Base part number for standard three-phase full-controlled thyristor rectifier stack of Reliance high-power DC drive platform.S: Surge-resistor equipped type, only independent power resistance for spike suppression without matching absorption capacitor.R: Revised mechanical structure, optimized radiator fixed structure and enhanced anti-vibration mounting design.
3. Technical Specifications
Rated input three-phase AC 380V/480V, input voltage allowable fluctuation ±10%; continuous rated DC output current 190A, 60s short-time overload peak current 320A; single thyristor reverse withstand voltage 1800V, isolation voltage between main power circuit and trigger control circuit 2500Vrms. Operating ambient temperature: -5℃~+60℃, relative humidity 5%~95% non-condensing. Adopts finned aluminum alloy radiator with natural air cooling, overall weight approx 3.75kg; built-in single-phase varistor overvoltage protection, no integrated RC absorption capacitor inside each thyristor branch.
4. Interface and Communication Configuration
Heavy-duty large-current screw terminal blocks arranged on outer side for three-phase AC input wiring and DC positive/negative power output wiring connecting drive main power bus. Small pin terminal sockets reserved on trigger auxiliary board for external trigger signal hardwire connection from drive main control card. No RS485, fieldbus or serial communication port; all trigger and fault interlock signals adopt discrete hardwire transmission only.
5. Core Functions
Complete three-phase AC to adjustable DC full-wave rectification via thyristor phase-shift triggering, change DC output voltage synchronously with speed command to regulate DC motor rotating speed. Independent built-in surge resistors restrain turn-off voltage spike of thyristors and instantaneous grid surge voltage, avoid power device breakdown. Feed back overcurrent, phase-loss and internal short-circuit fault signals to main control board via auxiliary wiring to realize drive fault shutdown protection.
6. Application Scenarios
Fully compatible with Reliance MaxPak Plus, FlexPak3000 high-power DC variable speed drive cabinets. Widely used for main drive renovation of metallurgical rolling mills, large wire drawing machines, paper dryer transmission, rubber calender and plastic extrusion DC speed control equipment, used as replacement spare for damaged original SR-type rectifier stack on old production lines.
7. Operation and Maintenance Instructions
Cut off total three-phase AC input of drive cabinet and keep power off over 60min to release residual capacitance voltage before disassembly wiring and module removal for high-voltage protection. Quarterly maintenance: blow radiator gap and component dust with dry low-pressure compressed air, forbid liquid cleaning solvent touching thyristor chips and surge resistance components. Replace whole rectifier stack assembly once thyristor breakdown, branch open circuit or surge resistor aging burnout occurs instead of partial component repair; store spare unit in constant-temperature dry warehouse against damp corrosion and mechanical collision damage.
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