RELIANCE 86466-26T three-phase fully-controlled SCR thyristor rectifier stack
86466-26T is three-phase fully-controlled SCR thyristor rectifier stack for Reliance FlexPak3000 / MaxPak Plus DC drive power unit. It matches 846723T main control board, 847216-R/S field excitation PCB, 847492-V auxiliary power board and 86007-A dynamic brake board to form complete armature power assembly. Original OEM production is discontinued permanently; stocked goods include surplus original new parts and full-load bench tested refurbished modules. Interchangeable alternatives:86466-26,86466-26R,86466-26S,86466-26V. T suffix stands for high-temperature reinforced version with upgraded high-temperature resistant SCR chips and enhanced heat dissipation design for high ambient temperature workshop environment. It implements three-phase AC to adjustable DC phase-controlled rectification with integrated dynamic brake circuit for DC motor speed regulation and regenerative power dissipation during deceleration.
Description
1. Product Brief Introduction
86466-26T is three-phase fully-controlled SCR thyristor rectifier stack for Reliance FlexPak3000 / MaxPak Plus DC drive power unit. It matches 846723T main control board, 847216-R/S field excitation PCB, 847492-V auxiliary power board and 86007-A dynamic brake board to form complete armature power assembly. Original OEM production is discontinued permanently; stocked goods include surplus original new parts and full-load bench tested refurbished modules. Interchangeable alternatives:86466-26,86466-26R,86466-26S,86466-26V. T suffix stands for high-temperature reinforced version with upgraded high-temperature resistant SCR chips and enhanced heat dissipation design for high ambient temperature workshop environment. It implements three-phase AC to adjustable DC phase-controlled rectification with integrated dynamic brake circuit for DC motor speed regulation and regenerative power dissipation during deceleration.
2. Model Definition
86466: Universal base part number of FlexPak3000 series armature SCR rectifier stack;26: Current specification code for rated continuous 90ADC armature DC output;T: High-temperature reinforced customized edition, cross compatible replacement with R revised version, S surge suppression version and V standard high-temperature model for field maintenance.
3. Technical Specifications
Three-phase AC input:208/230/460VAC,50/60Hz; nominal rated DC output voltage 230VDC, continuous rated armature DC output 90ADC, 60-second short-time overload rating 135ADC(150% overload). Adopts thickened double-sided aluminum fin heat sink with optimized air channel layout; internally equipped six high-temperature grade industrial SCR thyristors, full RC overvoltage absorption components and integrated dynamic brake power switching module. Working ambient range -12℃~+82℃(improved upper limit vs R/S type), non-condensing humidity 5%~95%; overall dimension 252mm×162mm×102mm, net weight approx 1.75kg; isolation withstand voltage between high voltage power terminals and low voltage trigger control terminals ≥3000Vrms.
4. Interface and Communication Configuration
Large thick copper bolt terminals for three-phase main AC input and armature DC positive/negative high-current power wiring; multi-point screw terminal block for trigger pulse input from main control PCB and brake fault hardwire feedback signal. No fieldbus or serial digital communication ports; all power and control signals adopt discrete hard-wired connection only.
5. Core Functions
Receive phase-shift trigger pulses from 846723T control board to finish three-phase full-wave SCR phase-controlled rectification, convert three-phase industrial AC into continuously adjustable DC voltage to realize closed-loop speed control of 40~60HP heavy-duty DC armature motor. Cooperate with 86007-A brake PCB: when DC bus voltage exceeds set threshold under light or no-load status, built-in brake switch activates external braking resistor to consume regenerative energy during motor deceleration and stop. Full-set internal RC absorption network restrains instantaneous surge overvoltage to avoid SCR breakdown; meanwhile collects overheat and overcurrent interlock signals and feeds back to master board to trigger drive fault protection lockout. High-temperature optimized components guarantee stable continuous operation under high cabinet inner temperature.
6. Application Scenarios
Matching spare rectifier for FlexPak3000/MaxPak Plus 40~60HP DC drive cabinet; specially preferred for high-temperature factory environments such as rubber extrusion workshop, metallurgical transmission, hot rolling auxiliary drive, high-temperature papermaking production line and heavy industrial conveyor DC drive overhaul replacement.
7. Operation and Maintenance Instructions
Cut off total three-phase cabinet AC power and wait more than 60 minutes for full residual charge discharge of internal high-voltage bus capacitor before disassembly to avoid high-voltage electric shock. Semi-annual maintenance: clean heat sink fin dust with dry low-pressure compressed air, forbid liquid cleaning solvent touching internal SCR and high-power resistance elements. After on-site replacement installation, complete static trigger inspection and no-load DC voltage calibration before full-load motor trial run; spare modules shall be stored in sealed anti-static package inside constant temperature dry warehouse to prevent internal component insulation aging from dampness.
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