| Item | Description | |------|-------------| | Model | Denyo AVR NTA‑5A‑2DB | | Type | Automatic Voltage Regulator (AVR) for diesel generators | | Primary Use | Maintains stable output voltage (±5 % tolerance) under varying load conditions | | Power Rating | 5 kVA (5 kW) – suitable for small‑to‑medium commercial or industrial generators | | Input Voltage | 380 V ± 10 % (three‑phase) | | Output Voltage | 220 V ± 5 % (three‑phase) | | Frequency | 50 Hz (± 1 %) | | Operating Temperature | –10 °C to +50 °C | | Protection Features | Over‑voltage, under‑voltage, over‑frequency, under‑frequency, short‑circuit, overload, thermal overload, loss‑of‑excitation |

Keep a maintenance log that includes date, operating hours, observations, and corrective actions. | Fault Code / Symptom | Likely Cause | Recommended Action | |----------------------|--------------|--------------------| | E1 – Over‑voltage | Input voltage too high, regulator malfunction, or sensor drift. | Verify generator voltage at the AVR input. If within spec, reset the AVR (power‑cycle). If fault persists, replace the voltage sensor or the AVR. | | E2 – Under‑voltage | Input voltage too low, fuel‑starvation, or loose input connections. | Check generator speed and fuel supply. Tighten input terminals. | | E3 – Over‑frequency | Engine speed exceeds 50 Hz set‑point. | Inspect governor and speed sensor. | | E4 – Under‑frequency | Engine speed too low. | Same as above – check governor, fuel pump. | | E5 – Over‑current / Overload | Load exceeds 5 kVA, or short circuit on output side. | Reduce load, inspect load busbars for faults, check protective devices. | | E6 – Thermal overload | Internal temperature > 85 °C (fan failure, blocked ventilation). | Clean ventilation, verify fan operation, replace fan if needed. | | No display / dead unit | Power supply (24 VDC) missing or dead battery. | Confirm 24 VDC present. Replace control‑power source or battery. | | Communication failure (RS‑485) | Wrong baud rate, missing termination, wiring error. | Verify settings on master device, add 120 Ω termination at the far end, re‑check wiring polarity. | | Intermittent voltage | Loose terminal, damaged cable, or aging voltage sensor. | Tighten all connections, replace suspect cables, consider sensor replacement. |

Symlex Layer Set up guidelines

You can set up Symlex Layer by downloading it from Play Store or App Store. However, if you are a part of an organization, then you need to have your ID and password from the admin of that organization.

denyo avr nta-5a-2db manual

Our support team will help you to set up the admin panel of Symlex Layer.

| Item | Description | |------|-------------| | Model

You can create new user from your admin dashboard based on your subscription plan. However, if you face any difficulties, feel free to contact our support team.

If within spec, reset the AVR (power‑cycle)

You can delete any user from your admin dashboard.

You can change the email of a member from your admin dashboard.

Billing & Payment

A Symlex Layer account cost $7/month for monthly package and $5/month for yearly package. However, you can get customized plan if you want. Feel free to contact us for customized packages.

Currently, we only accept bank payment. However, we are also working on adding new payment methods for your convenience.

We offer 14 days money-back guarantee for our users. However, this may vary depending on packages and offers.

Denyo Avr Nta-5a-2db Manual Apr 2026