If output exceeds 130V (on a 120V circuit), the AVR may have failed internally. No Voltage: exciter field winding
There are revisions (2DB vs 2DB1, 2DB2). Extra pots are usually for "droop" or "under-frequency roll-off." The core functionality remains the same. denyo avr nta-5a-2db manual
| Function | How to Use | What to Watch For | |----------|------------|-------------------| | | Use the front‑panel knob (or remote command) to set the desired output voltage within the 220 V ± 5 % range. | The AVR will automatically correct dips/spikes; no manual tweaking needed under normal load. | | Frequency Control | The AVR maintains 50 Hz automatically. Some models allow a ±1 Hz set‑point via dip‑switches. | If frequency deviates, check generator speed sensor and fuel system. | | Load Sharing (Parallel Operation) | When running two generators in parallel, set the “load‑share” dip‑switches to “parallel” mode and ensure identical voltage/frequency settings. | Verify that both AVRs report the same voltage; mismatched settings can cause circulating currents. | | Self‑Diagnostic | The unit runs a self‑test each minute and flashes a fault code on the LED if a problem is detected. | Note the fault code (e.g., “E1 – Over‑voltage”) and act according to the troubleshooting table. | | Remote Monitoring | Connect an RS‑485 master (PLC, SCADA, or laptop) and query the Modbus registers: ‑ 0x0000 – Input Voltage ‑ 0x0001 – Output Voltage ‑ 0x0002 – Frequency ‑ 0x0010 – Fault Code | Use a simple Modbus client to log data or set alarm thresholds. | If output exceeds 130V (on a 120V circuit),