AMF CONTROLER BERNINI BE42 GENSET CONTROLLER GENERATOR CONTROL SN-93274

The Bernini BE42 is a sophisticated Automatic Mains Failure (AMF) and generator set controller designed for reliable standby power automation. With Serial Number 93274, this specific unit is a fully programmable controller, typically integrated into a control panel to monitor, protect, and automatically control diesel or gas generator sets in standby applications.

Its primary function is to ensure seamless transition to backup power upon failure of the main utility supply (mains) and to return the load to utility power once it is restore.

Key Features & Capabilities:

1. Automatic Mains Failure (AMF) Logic: The core function. Continuously monitors the 3-phase utility supply for under/over voltage and frequency. Upon detecting a fault, it automatically starts the generator, transfers the load via a contactor or breaker, and manages the shutdown sequence when mains returns.

2. Comprehensive Display & Interface:

   • Backlit LCD screen for clear viewing of all parameters, measurements, alarms, and controller status.

   • Intuitive keypad for navigation, programming, and manual control.

3. Extensive Monitoring & Measurements:

   • Mains (Utility): 3-phase Voltage, Frequency.

   • Generator: 3-phase Voltage, Frequency, Current, Active Power (kW), Apparent Power (kVA), Power Factor, Engine Speed (RPM), Oil Pressure, Coolant Temperature, Fuel Level, Battery Voltage, Running Hours.

   • General: Time and Date.

4. Protection & Alarm Functions: Configurable alarms and shutdowns to protect the generator set, including:

   • Engine: High Coolant Temp, Low Oil Pressure, Overspeed, Fail to Start, Crank Disconnect.

   • Electrical: Overcurrent, Over/Under Voltage, Over/Under Frequency.

   • Pre-alarms (warning) and critical (shutdown) levels are user-configurable.

5. Control Functions:

   • Modes: Auto / Manual / Off (Test) selector switch.

   • In Auto: Fully automatic operation based on mains status.

   • In Manual: Local control for testing and maintenance.

   • Engine Start/Stop Control.

   • Load Transfer Control: Commands the main utility contactor and generator contactor.

6. Programmable Settings:

   • Timers: Crank Time, Cool-down Period, Warm-up Period, Number of Start Attempts, Transfer/Retransfer Delays.

   • Voltage, Frequency, and Current thresholds.

   • Engine sensor parameters (scaling for temp, pressure, etc.).

7. Communication & Connectivity (Typical):

   • Often equipped with standard communication ports (e.g., RS-485 Modbus RTU) for integration into Building Management Systems (BMS) or remote monitoring solutions.

   • Dry contact (relay) outputs for remote alarm signalling.

8. Data Logging: Stores a history of alarm events with timestamps for diagnostics.

Typical Applications:

• Standby Power Systems for commercial buildings (hospitals, data centers, offices).

• Industrial facilities requiring critical backup power.

• Telecommunications infrastructure.

• Water and wastewater treatment plants.