RELIANCE 0-51865-21 FBC Field Board Card

Technical SpecificationsModel:0-51865-21 Brand:RELIANCE Product type:FBC Field Board Card Weight:0.61kg Dimension:210mm135mm30mm Operating temperature:0℃ ~ 60℃ Storage temperature:-40℃ ~ +85℃ Relative humidity:5%~85%,non-condensing Certification:CE

System compatibility0-51865-21 is RELIANCE upgraded FBC rack plug-in field excitation control board. It is advanced revised variant of 0-51865,0-51865-1 and 0-51865-2,designed for Reliance MaxPak Plus series spindle DC drive rack,cooperates with USAB summing amplifier board and CGSA gate summing board. It controls DC motor field excitation current and adopts optimized field weakening logic for wide-range spindle high-speed operation. Commonly used for maintenance and spare replacement of old industrial spindle DC drive equipment.

Function0-51865-21 is dedicated FBC field excitation control PCB for RELIANCE MaxPak Plus DC drive system. Receive speed reference and field current feedback signals from drive control rack. Regulate motor field excitation current to maintain stable magnetic flux within base speed range. Optimized field weakening transition logic,reduces torque ripple during switching between constant torque and constant power region. Multiple front panel high-precision potentiometers for field current limit,field weakening threshold and dynamic response calibration. Generate field SCR firing pulses to control excitation power output. Dual LED indicators separately display normal running status and field fault alarm. Upgraded component selection improves long-term stability under continuous heavy load working condition.

InstallationPower off the whole drive cabinet and cut main power supply. Insert 0-51865-21 FBC board into drive rack slot and lock retaining screw. Connect gold finger backplane connector for internal signal exchange. Separate low-level analog control wiring from field power pulse cables. Power on system,calibrate field current limit and field weakening parameters via front potentiometers. Verify field current stability and seamless high-speed field weakening transition response.

InterfaceBackplane edge connector,speed reference input,field current feedback input,field SCR trigger pulse output,auxiliary power terminal,shield grounding terminal,dual status LED indicators,front multi-turn calibration potentiometer bank.

FeatureRELIANCE 0-51865-21 rack mount FBC field excitation control board. Discrete analog closed-loop circuit for high-precision field current regulation. Multiple front panel multi-turn high precision adjustable potentiometers for multi-parameter calibration. Enhanced thermal stability and load adaptability compared with 0-51865-2 version. Gold plated edge connector for reliable rack signal transmission. Dual LED visual indication for excitation running and fault state. Industrial PCB design for long continuous running in harsh factory environment. Discontinued obsolete board,supply only for old Reliance MaxPak Plus DC drive system spare replacement. Suitable for metallurgy,paper-making production line spindle DC drive renovation and maintenance.

DiagnosticMotor high-speed torque oscillation:field weakening parameter drift or component aging; Unstable field current:feedback sampling circuit damage; Field fault LED lit:field overcurrent or excitation loss; No excitation output:SCR trigger circuit failure; Intermittent speed variation:backplane pin oxidation and poor contact.

Product BriefRELIANCE 0-51865-21 is FBC field board card. It completes closed-loop regulation of DC motor field excitation current and enhanced field weakening control for Reliance MaxPak Plus legacy spindle DC drive,realizing wide speed range of constant torque and constant power,widely used as spare part for legacy DC drive equipment maintenance.

Disclaimer:All parameters are for reference only and not the basis of quotation. Goods are scarce,overseas delivery lead time 3-7 working days. It is only used for equipment maintenance and retrofit.