RELIANCE 846723T original UCC1 control circuit board
846723T is Reliance Electric original UCC1 control circuit board, core control spare part for MaxPak Plus and FlexPak series DC variable speed drives, original production discontinued, supplied via surplus new inventory and professionally refurbished tested goods only. It serves as core analog trigger & speed regulation mainboard, responsible for thyristor phase-shift trigger signal calculation, speed closed-loop PID control, drive fault detection and interlock logic processing to match supporting three-phase rectifier stacks such as 846680-RC/846680-SR for complete DC drive power control loop. The suffix T stands for factory latest revised PCB layout with optimized anti-interference circuit layout and component upgrading.
Description
1. Product Brief Introduction
846723T is Reliance Electric original UCC1 control circuit board, core control spare part for MaxPak Plus and FlexPak series DC variable speed drives, original production discontinued, supplied via surplus new inventory and professionally refurbished tested goods only. It serves as core analog trigger & speed regulation mainboard, responsible for thyristor phase-shift trigger signal calculation, speed closed-loop PID control, drive fault detection and interlock logic processing to match supporting three-phase rectifier stacks such as 846680-RC/846680-SR for complete DC drive power control loop. The suffix T stands for factory latest revised PCB layout with optimized anti-interference circuit layout and component upgrading.
2. Model Definition
846723: Base part number of standard UCC1 main control board for Reliance medium-power MaxPak DC drive control system.T: Type T revised version, upgraded circuit layout, improved EMI suppression design and optimized thermal component configuration compared to non-T base edition.
3. Technical Specifications
Working auxiliary control power input AC 110V/120V 50/60Hz, allowable input voltage deviation ±10%. Analog speed command input 0~10VDC standard signal; armature voltage feedback, tachometer generator speed feedback terminal reserved. PCB operating temperature range -10℃~+65℃, applicable environment humidity 5%~93% non-condensing. Onboard integrated adjustable potentiometers for speed gain, IR compensation, current limit calibration; built-in overcurrent, phase loss, overvoltage hardware detection circuit, board dimension approx 235mm×152mm, single board net weight around 0.78kg.
4. Interface and Communication Configuration
Multi-row pin plug-in terminal connectors onboard: large terminal group for auxiliary power supply, armature feedback, field excitation signal wiring; small pin terminal sockets for external speed setting analog input and fault relay output wiring. Exclusive dedicated pin terminal set for hardwire connection with rectifier stack trigger auxiliary board to output phase-shift trigger pulses. No fieldbus, RS485 or digital communication ports; all control and feedback signals adopt hardwire discrete wiring transmission only.
5. Core Functions
Receives external analog speed setpoint signal and motor actual speed feedback signal to finish closed-loop PID speed regulation, calculates corresponding phase-shift angle and outputs sequential trigger pulses to drive rectifier thyristors, realizing continuous adjustable DC output voltage to control DC motor speed. Executes armature overcurrent limit, field loss protection, mains phase missing fault monitoring; outputs fault interlock switching signal to cut off drive main power loop once abnormal state detected, meanwhile locking trigger output to protect rectifier power stack and drive load. Onboard adjustable potentiometers realize on-site parameter calibration of speed loop gain, drop compensation and maximum output current limit.
6. Application Scenarios
Matching complete set with Reliance MaxPak Plus, FlexPak3000 medium-power DC drive cabinets, paired with 846680 series rectifier stacks for metallurgical drawing equipment, papermaking dryer transmission, rubber mixing mill DC speed control drive system maintenance replacement; widely used for old production line drive control board aging damage retrofit replacement.
7. Operation and Maintenance Instructions
Cut off drive cabinet main AC input and auxiliary control power, keep power-off standby over 30 minutes for onboard electrolytic capacitor residual charge discharge before unplugging terminal connectors and removing circuit board to avoid electric shock damage. Regular half-year maintenance: use dry low-pressure compressed air to clean PCB surface accumulated dust, avoid cleaning liquid directly contacting PCB copper foil and patch components. After replacement or maintenance, complete no-load parameter calibration via onboard potentiometers before full-load trial operation; store spare control board in sealed constant-temperature dry environment with anti-static packaging to prevent damp corrosion and static breakdown of onboard semiconductor devices.
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