| General |
| Product | PFC-7000T — Reactive Power Compensation Control Relay |
| Processor | STM32H7SE46 ARM Cortex-M7 @ 600 MHz |
| Operating System | FreeRTOS (real-time) |
| Memory | OCTO-SPI NOR Flash 64 MB + HyperRAM 16 MB |
| Display | 5" TFT capacitive touchscreen, 800×480 px, 24-bit color |
| Power Supply | 220V AC → 24V DC (IRM-20-24) → 5V → 3.3V |
| Operating Temperature | −10°C ~ +55°C |
| Step Outputs | 18 channels (relay or transistor, selectable) |
| Alarm Relay | 1 (dedicated) |
| Buzzer | Built-in audible alarm |
| Digital Inputs | 3 (external fault, generator input) |
| Measurement |
| Voltage | 3-phase independent (L-N and L-L), MCP6021 op-amp signal conditioning |
| Current | 3-phase independent, CT primary 1–5000 A, CT secondary 1A or 5A selectable |
| Active Power (P) | kW, per phase and total |
| Reactive Power (Q) | kVAr, per phase and total (inductive/capacitive direction) |
| Apparent Power (S) | kVA, per phase and total |
| Power Factor (cos φ) | Per phase and average + tan φ |
| Frequency | 50/60 Hz (selectable, auto-detection) |
| ADC | 12-bit, 25 kHz sampling, 6 channels (3V + 3I) |
| Harmonic Analysis |
| Range | 2nd – 50th harmonic (49 components) |
| Method | 512-point FFT at 25 kHz sampling |
| Voltage Harmonics | % and absolute (V) |
| Current Harmonics | % and absolute (A) |
| THD-V and THD-I | Total, odd, even harmonic separation |
| K-Factor | Transformer loading indicator |
| Crest Factor | Voltage and current |
| Standard | IEC 61000-4-7 compliant |
| Control |
| Steps | 18 channels |
| Output Types | Relay / Transistor (SSR/Thyristor) / Mixed — factory selectable |
| Control Modes | 6 modes (3P 3×6 L-N, 3P mixed, 3P 3×6 L-L, 3P 18×3P, 1P 18×3P, 1P + capacitor current) |
| Control Principles | Sequential / Circular (FIFO) / Intelligent (closest ΔQ) / Combined detuned |
| Target cos φ | 0.30 – 1.00, IND or CAP selectable, dual target support |
| Hysteresis | ±0.02 |
| Connection Time | 50–1000 ms (configurable) |
| Disconnection Time | 50–1000 ms |
| Discharge Time | 50–1000 ms |
| Communication |
| RS-485 | Modbus RTU, SN65HVD72DR, 9600–115200 baud |
| Ethernet | Modbus TCP, LAN8742A PHY, Port 502 |
| USB | Type-A, firmware update support |
| Registers | 1070 Input + 260 Holding + 58 Coil + 58 Discrete = 1446+ addresses |
| Protection |
| Overvoltage | >115% nominal → disconnect all steps |
| Undervoltage | <85% nominal → disconnect all steps |
| Overcurrent | >125% CT primary → disconnect all steps |
| Over-Temperature | > set threshold → disconnect all steps |
| THD-V Alarm | > set harmonic threshold → alarm (log) |
| 24V Supply Fault | <21V or >27V → disconnect all steps |
| Under-Compensation | cos φ deviation from target → warning |
| Over-Compensation | cos φ deviation from target → warning |
| Fault Memory | 20 records (FIFO), NOR Flash persistent, timestamp + fault code + phase |
