Control and Safety Modules

Subsea safety control modules

Designed with common-off-the-shelf (COTS) components, the subsea safety control module provides a reliable and safe solution.  

The Functional Safety Programming tool is a part of the selected hardware components. It uses programming "blocks" that are TüV Rheinland certified according to IEC 61508.

The ESD & EQD shall be programmed to a predefined sequence with safety analog inputs to perform a safety action.

Subsea Electronics Module

The SEM includes standard COTS components in a “sleeved” design of payload. The payload is mounted to the top lid, providing easy access to the components with minimal need for any electrical disconnections.

The NEBB SEM comes with Modbus TCP Fieldbus support to be interfaced with RIO/networking switch. Configurable DI/DO/AO is also available for use if necessary.

An insulation monitoring device is installed for monitoring the 24V DC auxiliary supply of the SEM.

A modular RIO system made especially for harsh applications is used and can be expanded upon customer needs. 

Subsea Battery UPS

The subsea battery UPS consists of several Li-ion cells, with a complete charging unit and battery management system. The subsea battery is contained in a separate 300 bar pressure housing to be interfaced with the safety SEM.

The UPS operates in "online" mode, hence is connected in series with the external 24V power supply. The power is fed through the UPS and to the safety SEM.

• The UPS has two modes of operation:
  Idle: Power is taken from the UPS input, regulated to steady 24V, and delivered to the SEM. (battery is not activated in this mode).
• Power failure: When there is no power available on the UPS input, it will go into power failure mode. The battery will activate to supply a steady 24V on the UPS output to feed the safety SEM.