RELIANCE 847216-S BRCC1 field excitation control PCB
847216-S is Reliance Electric BRCC1 field excitation control PCB belonging to MaxPak & FlexPak series DC drive system, interchangeable cross-version with 847216-R, OEM original production discontinued, supplied by surplus new spare parts and fully bench-tested refurbished stock only. It forms complete excitation closed-loop control set together with main armature control board 846723T and SCR rectifier stack 846747-RB, dedicated for DC motor field winding constant-current excitation regulation, field loss detection and field overcurrent interlock protection. S suffix denotes factory standard stock original specification version without revised circuit modification compared to R upgraded edition.
Description
1. Product Brief Introduction
847216-S is Reliance Electric BRCC1 field excitation control PCB belonging to MaxPak & FlexPak series DC drive system, interchangeable cross-version with 847216-R, OEM original production discontinued, supplied by surplus new spare parts and fully bench-tested refurbished stock only. It forms complete excitation closed-loop control set together with main armature control board 846723T and SCR rectifier stack 846747-RB, dedicated for DC motor field winding constant-current excitation regulation, field loss detection and field overcurrent interlock protection. S suffix denotes factory standard stock original specification version without revised circuit modification compared to R upgraded edition.
2. Model Definition
847216: Base part number of BRCC1 standard field excitation regulator board for Reliance medium-power DC drive platform.S: Standard original factory specification version, default baseline PCB layout design, original component configuration without post-factory circuit upgrade or surge circuit modification used on R revision.
3. Technical Specifications
Control auxiliary power input AC 110/120V 50/60Hz, input tolerance ±10%; adjustable DC field output range 0~230VDC, rated continuous field output current 18A, 60s short-time overload peak 26A. Operating ambient temperature -10℃ ~ +65℃, relative humidity 5%~93% non-condensing. Power-control isolation withstand voltage 2000Vrms; PCB outer dimension 218mm×146mm, net weight approx 0.68kg, equipped with onboard multi-turn trimming potentiometers for field current setpoint and field loss trip threshold calibration.
4. Interface and Communication Configuration
Edge-mounted multi-group terminal blocks: large screw terminals for auxiliary AC power input and motor field positive/negative output wiring; small pin plug connectors for hardwire interlock signal exchange with main UCC1 control board 846723T and external fault feedback wiring. No RS485, fieldbus or digital communication ports, all control & fault signals adopt discrete hardwire connection mode only.
5. Core Functions
Receives enable interlock command from main speed control board to activate field power loop, realizes closed-loop constant-current field excitation control via internal phase shift control circuit to stabilize motor magnetic flux against grid voltage fluctuation and load change. Real-time field current sampling monitoring to trigger field loss protection upon field coil open-circuit/under-current fault, output interlock trip signal to lock armature rectifier trigger pulse and cut off main drive power; built-in hardware overcurrent cutoff to avoid field winding burnout from overload. Onboard potentiometers support on-site parameter setting without extra auxiliary test equipment.
6. Application Scenarios
Compatible with Reliance MaxPak Plus, FlexPak3000 medium-power DC drive cabinets, matched with 846723T control board and 846747-RB power rectifier stack; widely used as replacement spare part for papermaking drying roller, metal wire drawing machine, plastic calender DC drive field control board failure maintenance on legacy industrial production lines.
7. Operation and Maintenance Instructions
Cut off cabinet main AC power and auxiliary control supply, keep power-off longer than 30 minutes to discharge internal filter capacitor residual high voltage before disassembly and replacement for electric shock prevention. Conduct quarterly maintenance: blow PCB surface dust with dry low-pressure compressed air, prohibit corrosive cleaning liquid from contacting circuit traces and semiconductor components. After board replacement, complete no-load field current calibration via onboard trim pots before full-load commissioning; store spare boards in sealed anti-static constant-temperature dry warehouse to prevent dampness and static component damage.
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