Brahma Microprocessor-based control unit NDM11PR 37505001

The Brahma NDM11PR is a microprocessor-based control unit for automating ignition, flame monitoring, and safe operation of atmospheric progressive burners using gas or liquid fuel in intermittent mode. It operates on a supply voltage of 220–240 V, with a safety time of 3 seconds and a pre-purge time of 30 seconds. The unit works with an ionisation electrode or a photodiode (FD) for flame detection, has a protection class of IP40, and measures 10.7 x 8.1 x 3.6 cm. It is designed for operating temperatures from -20 to 70 °C.

Control boxes of this type are selected by matching the supply voltage, safety time, pre-purge time, and flame detector type to the burner's requirements. Before ordering, verify the mounting dimensions and ensure the control box is compatible with the burner's fuel type and operating mode. Installation typically involves connecting the power supply, flame sensor, and ignition transformer according to the wiring diagram, and securing the unit in a suitable enclosure or on a DIN rail.

Common failures include the burner failing to ignite or locking out after the safety time, often due to a faulty flame sensor or incorrect wiring. If the control box loses flame signal during operation, it may shut down and require a manual reset. Check the flame detector, connections, and supply voltage for issues when these symptoms occur.