NFPA 20 Auto mode of operation

NFPA 20 Auto mode of operation; controller in standby. Pressure is normal. No alarms are active.


NFPA 20 Auto mode of operation; controller in AUTO mode. Engine is running. No alarms are active.

NFPA 20 Auto mode of operation engine running

NFPA 20 Auto mode of operation; controller in AUTO mode. Engine is running. Engine parameters on display.

NFPA 20 Auto mode of operation engine instruments


The Be126 can start the engine at anytime. Do not work on equipment, which is controlled by the Be126. When servicing the engine, disconnect the batteries and battery chargers. We recommend that warning signs be placed on equipment indicating the above.


Push the [AUTO] push-button until the yellow AUTO indicator illuminates (connect a lamp to JB-4 output); the display will evidence the message [AUTO]. The engine starts when the Be126 detects one of the following condition:

  • the water pressure switch is open (digital input JF-4)
  • the water level switch is open (digital input JF-7)
  • the water pressure drops below the [START DEMAND] setting

The yellow indicator >LPS< blinks when the Be126 detects a drop of pressure. The display will switch the message [START DEMAND OFF] to [START DEMAND ON]. The Be126 will initiate the start sequence after a [START DELAY] bypass time (see the [MISCELLANEOUS] menu 21.0.1). Depending on your settings, the engine will run at idle speed or it will run immediately at nominal speed.

When the engine is running, use the display arrows to browse the instruments. If you get lost during navigation, push the [HOME] button: the display will open the ‘System Status Page’ that is the display home page. Based on your settings (NFPA-EN12845 or Engine Protection Mode), the Be126 may stop the engine in AUTO mode of operation when the pressure returns normal. You can stop the engine by pushing the [OFF] button.

We remind you that in case you programmed the controller to work according to NFPA 20 specifications, only an OVERSPEED  condition can shut down the engine. All the others alarms provide only a warning .

The Be126 will periodically test the engine if the scheduler is correctly programmed. During the test, the display will indicate the message [SCHEDULED TEST] . The engine will stop based on your settings. The [EVENT HISTORY] register records in real-time all sequences. You can browse the event log at any time.


When the Be126 is in AUTO mode of operation, you can carry out a test of the automatic system by pushing the [PUMP TEST] button. The Be126 will activate the drain to initiate a test. The sequences are very well described in the ‘TEST mode’ section.

To find out more about AUTO mode of operation, consult the chapter 12 of the NFPA 20 Standard and sections 10.9.7---.13 of the EN 12845 Standard.

When you connect the input JF-10 to battery minus, the Be126 will activate the ‘Engine Protection Mode’ software. If you enable a shutdown (Oil pressure, Temperature, Fuel and so on), the engine will stop accordingly. Automatic START & STOP of the engine are driven by the status of the water pressure or water level. You can program different delays and options to start & stop the diesel engine. The [MISCELLANEOUS] menu  contains the basic settings. The ‘Engine Protection Mode’ will allow you to use Be126 to control and protect diesel engine in water pump station or irrigation systems.


The Be126 NFPA 20 controller offers several test facilities. It depends upon you final application. Visit the TEST FACILITIES PAGE.



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