User manual

OceanWorks International
120 – 6741 Cariboo Road
Burnaby, BC V3N 4A3
Canada
www.oceanworks.com
Document Number: 0848-RPT002 Subsea System User Manual
Author: Graham Cunliffe Page 8 of 27 Revision 1.0
2. Principles of Operation
2.1. General Operation
The JB receives 400VDC from a Medium Voltage Converter (MVC) and distributes low
voltage (LV) to six to ten instrument ports at 12VDC, 15VDC, 24VDC, 48VDC and high
voltage (HV) to up to three ports at 400VDC as defined in the NEPTUNE Junction Box
System Design Document (0848-RPT001). The JB has a single 1000Baset fiber or 100BaseT
copper uplink and up to ten Ethernet links and four EIA232, EIA422 or EIA485 (2-wire or 4-
wire) serial links.
The JB is controlled by the subsea software which can be accessed remotely via TELNET.
The user is able to control the state of the instrument ports and is provided feedback in the
form of telemetry from the JB.
2.2. Transportation
During transportation the JB must be kept within the temperature range of -20°C to +70°C.
The JB should be transported in crates that provide sufficient protection to the JB and, if fit,
the extruding ODI penetrator. O-rings for the JB face SeaCon connectors should not be fit,
but rather bagged, tagged and attached to the ODI penetrator. The SeaCon connectors and
ODI Remotely Operated Underwater Vehicle (ROV) connector should have dust caps
installed to prevent contaminants from entering them.
2.3. Installation
When connecting the uplink and instruments to the JB, ensure that O-rings are installed in
the SeaCon faces and that all connectors (SeaCon and ODI) are properly seated. Do not hot
swap either the SeaCons or the ODI.
2.4. Safety Considerations
During transportation and installation, the NEPTUNE Lifting Frame Assembly should be used
to move the JB whenever possible. All lifting devices, slings, support fixtures, cradles and
other equipment used to move or secure the JB must be rated for safe working loads that
exceed that of the JB (crated and uncrated).