Maintenance Manual
KONGSBERG PROPRIETARY.
This document and its accompanying elements contain KONGSBERG
information which is proprietary and confidential. Any disclosure, copying, distribution or use is prohibited if not
otherwise explicitly agreed with KONGSBERG in writing. Any authorized reproduction, in whole or in part, must
include this legend. ©2022 KONGSBERG - All rights reserved.
P a g e
12 |
73
The Power Pack consists of two pump units operated separately or combined. Each pump unit
provides oil with sufficient flow to develop the specified rudder angle. One pump unit is normally in
operation, while the other is acting as a stand-by unit. However, it is possible to run both pump units
simultaneously and thereby doubling the turning rate when shortest possible steering time is
required. The pump unit are normally remotely controlled but may also be controlled manually at
the Control valve on the Power Pack in the Steering Gear room.
Emergency steering
–
automatic isolation
The IMO-function of the IRV Steering Gear is activated when a significant loss of hydraulic oil in one
of the systems is detected. In this case, emergency steering mode is automatically activated.
Detection is done by the electrical level switches located in the hydraulic Power Pack tank, illustrated
in the figure below.
For a situation where the system starts to loose oil, the following alarms and actions will develop:
CASE 1: BOTH PUMP UNITS IN OPERATION
CASE 2: ONE PUMP UNIT IN OPERATION
1.
Common Oil Level switch is activated;
Low Oil Level alarm will appear.
2.
Low Oil Level switch is activated;
Isolation valves will be activated and closed, separating
system 1 and 2.
3.
Steering continues with both systems.
4.
Low Low Oil Level switch is activated on defect system;
by-pass valve on defect system activated. Automatic stop
of pump unit on defect system will not occur. Pump unit on
defect system must be stopped.
1.
Common Oil Level switch is activated;
Low Oil Level alarm will appear.
2.
Low Oil Level switch is activated;
Isolation valves will be activated and closed, separating
system 1 and 2. Pump 2 will start automatically!
3.
Steering continues with both systems.
4.
Low Low Oil Level switch is activated on defect system;
by-pass valve on defect system activated. Automatic stop
of pump unit on defect system will not occur. Pump unit on
defect system must be stopped.
Low Low Oil Level system 2
Low Low Oil Level system 1
Low Oil Level
Common Oil Level
1
2
