RELIANCE 0-51814-3 VFCA Board

Technical SpecificationsModel:0-51814-3 Brand:RELIANCE Product type:VFCA Board Weight:0.58kg Dimension:205mm132mm28mm Operating temperature:0℃ ~ 60℃ Storage temperature:-40℃ ~ +85℃ Relative humidity:5%~85%,non-condensing Certification:CE

System compatibility0-51814-3 belongs to RELIANCE revised VFCA voltage frequency control analog board. It is rack plug-in card for Reliance legacy DC drive cabinet,cooperates with main regulator board and feedback sampling circuit. It upgrades voltage and frequency analog control function compared with 0-51814-1 version for rack-style DC drive units. Commonly used for maintenance and spare replacement of old industrial DC drive equipment.

Function0-51814-3 is dedicated revised VFCA analog control PCB for RELIANCE DC drive system. Receive speed reference and feedback signals from other drive boards. Complete voltage and frequency analog calculation and signal conditioning. Generate regulating error signal to the main drive regulator card. Optimized onboard potentiometers for voltage and frequency loop calibration. Enhanced filter circuit to suppress high frequency interference from SCR commutation. Provide over-limit signal output for voltage or frequency protection. Stabilize speed loop response under heavy and variable load conditions.

InstallationPower off the whole drive cabinet and cut main power supply. Insert 0-51814-3 VFCA board into drive rack slot and lock retaining screw. Connect gold finger backplane connector for internal signal exchange. Separate low voltage analog signal wiring from high-current power bus. Power on system,calibrate voltage and frequency parameters via onboard trimmers. Verify speed stability under no-load and loaded operation.

InterfaceBackplane edge connector,analog reference input,error signal output,auxiliary power terminal,shield grounding terminal,status LED indicators.

FeatureRELIANCE 0-51814-3 rack plug-in VFCA analog control card. Discrete analog circuit for voltage and frequency control. Multiple onboard adjustable potentiometers for loop calibration. Improved noise suppression circuit to reduce thyristor switching interference. Gold plated edge connector for reliable rack contact. Industrial PCB design for long continuous running in harsh factory environment. Discontinued obsolete board,supply only for old Reliance DC drive system spare replacement. Suitable for metallurgy,paper-making production line DC drive renovation and maintenance.

DiagnosticDrive speed unstable:VFCA potentiometer drift or component aging; Incorrect voltage/frequency response:signal channel distortion; No error signal output:board auxiliary power missing; Speed jitter:commutation noise interference; Intermittent control failure:backplane pin oxidation and poor contact.

Product BriefRELIANCE 0-51814-3 is revised VFCA board. It performs analog voltage and frequency signal processing,loop calibration and error signal generation for Reliance legacy rack DC drive,widely used as spare part for legacy DC drive equipment maintenance.

DisclaimerAll 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.