Powercom BNT-V1.0 Circuit Diagram for BNT-400A/500A/600A UPS Repair

User question

Circuit diagram of BNT-V1.0

Artificial Intelligence Response

Direct answer to the question

• The exact, manufacturer schematic for PCB “BNT‑V1.0” has not been officially published, but the Powercom BNT‑400A/500A/600A Service Manual explicitly identifies the mainboard as “BNT‑V1.0 (PCB)” and provides block diagrams, interconnects, and service information. (files.elektroda.pl)
• For a true circuit diagram, technicians use the BNT‑V1.1/BNT‑V1.3 (a.k.a. “BNT‑V13A/B”) schematics; these are functionally equivalent to BNT‑V1.0 with only minor revision differences, and are suitable for repair and tracing. (scribd.com)
• A one‑page wiring diagram specifically for the 400A–600A models (PCB noted as BNT‑V1.1) is also available and helps map all connectors, relays, battery, and transformer wiring. (files.elektroda.pl)

Key points

• Use: Powercom “Black Knight” (BNT) line‑interactive UPS mainboard. (upspowercom.com)
• What you can download now: Service manual (BNT‑V1.0 referenced), full schematic for BNT‑V1.1/V1.3, and a wiring diagram. (files.elektroda.pl)

Detailed problem analysis

• Identity and context
  • Powercom introduced the BNT (Black Knight) series as economical line‑interactive UPSs. Boards in this family are labeled BNT‑Vx.y; BNT‑V1.0 appears in the BNT‑400A/500A/600A service documentation. (upspowercom.com)
• Architecture (what you will see on the schematic)
  • Input and AVR path: AC inlet → fuse/EMI filter → autotransformer/relay matrix for buck/boost → output relays. (scribd.com)
  • Charger: Rectified/limited AC feeds a battery charger (typically through controlled rectifier + current limit), monitored by the MCU. (scribd.com)
  • Inverter: 12 V battery drives a push‑pull or H‑bridge MOSFET stage into the main transformer for stepped output during backup; relay transfers the load. (scribd.com)
  • Control and sensing: An 8‑bit MCU (ports labeled PTA/PTB/PTD on the drawing) supervises relays (RY1/RY2/RY3), buzzer, LEDs, battery/AC voltage sense, and thermal/current protections. (scribd.com)
  • Low‑voltage rails and housekeeping: +5 V logic and +12 V driver rails derived from the charger/aux windings; test points and labels (+5V, +12V, BAT+) are printed on the schematic. (scribd.com)
• Version interchangeability
  • BNT‑V1.0 vs BNT‑V1.1/V1.3: Copper and reference designators align closely; differences are typically value changes (fuse/shunt, transformer taps, MOSFET ratings) across 400–600 VA variants rather than topology changes, which is why V1.1/V1.3 drawings are relied upon for V1.0 troubleshooting. (elektroda.com)
• What you will not get from the service manual alone
  • The BNT‑V1.0 service manual focuses on panels, block diagrams, connector maps, and troubleshooting—not a page‑by‑page component‑level schematic. Use the V1.1/V1.3 schematic alongside it. (files.elektroda.pl)

Current information and trends

• Powercom continues to list BNT among supported line‑interactive families, but newer families moved to denser, MCU/DSP‑centric control and different power stages; thus V1.x documentation is static and unlikely to be updated. (upspowercom.com)
• For legacy support, community‑hosted archives (service manuals and “BNT‑V13x” schematics) are the de‑facto source for detailed circuit diagrams. (user-service-manuals.com)

Supporting explanations and details

• Typical signals and parts you’ll match between your PCB and the V1.1/V1.3 schematic:
  • Relays: RY1A/RY2A/RY3A for input selection/transfer. (scribd.com)
  • Power semiconductors: Q‑designated MOSFETs in inverter legs; fast diodes/ZDs for snubbing and protection. (scribd.com)
  • Connectors: CN1/CN2 for mains/bypass, J‑series headers for sense and front panel; labels match the wiring diagram. (files.elektroda.pl)
  • Housekeeping rails and test points: +5V, +12V, BAT+, with a buzzer (BZ1) and status LED (LED1) on the logic page. (scribd.com)

Ethical and legal aspects

• The circuit information referenced here is from publicly accessible technical documents and community archives. Manufacturer IP may restrict redistribution of original files; use them for maintenance/repair of units you own or service with customer authorization. (smpcshop.com)
• Safety: This UPS contains lethal voltages and large stored energy. Follow lock‑out/tag‑out, discharge procedures, and isolated measurement practices.

Practical guidelines

• If you need a “circuit diagram of BNT‑V1.0” for repair today:
  1. Use the BNT‑400A/500A/600A Service Manual for topology, connector map, and troubleshooting steps. (files.elektroda.pl)
  2. Open the BNT‑V13B (or V1.1) schematic for component‑level tracing; cross‑check reference designators and nets (+5V, +12V, BAT+, relay coils). (scribd.com)
  3. Use the wiring diagram to verify external harnessing, battery, and transformer connections before powering. (files.elektroda.pl)
• Best practices
  • Photograph both PCB sides; mark suspect components; verify relay operation and inverter MOSFET shorts before applying battery. Use an isolation transformer for live diagnostics.
  • When differences arise (e.g., a component value/part number), prefer what is actually populated on your board; the V1.1/V1.3 drawing is your map, not absolute truth.

Possible disclaimers or additional notes

• Exact BNT‑V1.0 schematic pages have not surfaced from the OEM; you will rely on V1.1/V1.3 with cross‑verification on your hardware. (files.elektroda.pl)
• Community mirrors can move or be rate‑limited; keep local copies for bench use. (user-service-manuals.com)

Suggestions for further research

• If you share photos of your board (front/back) and the UPS model (e.g., BNT‑400A, BNT‑500A, BNT‑600A), I can annotate the V1.3 schematic and point to the exact nodes you need.
• For deeper study of BNT family behavior and common faults, cross‑reference technician threads and compiled notes that compare 600A vs 800AP part differences. (elektroda.com)

Brief summary

• You can’t get an OEM‑published BNT‑V1.0 schematic page set, but the Powercom service manual confirms the board identity and provides service data, and the BNT‑V1.1/V1.3 schematics provide the full circuit you need for tracing/repair with only minor revision differences. Use the wiring diagram to verify external connections. (files.elektroda.pl)

If you want, tell me which section you’re troubleshooting (charger, inverter, transfer relays, MCU control) and I’ll extract and label the relevant portion from the V1.3 drawing so it’s a drop‑in reference for your BNT‑V1.0 board.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.