ISO 20663:2020 pdf download

ISO 20663:2020 pdf download.Ships and marine technology — Grab dredger supervisory and control systems
1 Scope
This document specifies the components and structure, general requirements, and functional requirements of grab dredger supervisory and control systems.
It is applicable only to the installed components, functions or systems. It covers the design, manufacture and modifications.
2 Normative references
The following referenced documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8384, Ships and marine technology — Dredgers — Vocabulary
3 Terms , definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8384 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1.1 grab dredger supervisory and control system
GD-SCS
system used for supervising and controlling the operations of a grab dredger
3.1.2 dredging profile monitor
DPM
system used to accurately measure and monitor the grab dredger’s position and heading, and the grab bucket’s position and depth, via plane view and profile view
3.1.4 opening value
value of opening of the grab bucket, expressed in percent (%), where 0 % means closed and 100 % means fully opened
4 Components and structure
4.1 Components
The grab dredger is a dredger that excavates the soil with a grab.
The GD-SCS is an integrated system which consists of a SCADA and a DPM.
The SCADA is used to monitor and control the dredging process with a grab.
The main functions of the DPM are to measure the position and heading of the grab dredger, and the position and depth of the grab bucket, and to provide for visualization in the plan view with a numeric window and side views.
4.2 Structure
By using either a wireless or wired network, the GD-SCS consists of a collector, a controller, monitoring stations, etc. respectively in the grab dredger’s control room, the operator’s cabin or elsewhere, in order to monitor the dredging and the operations of the grab dredger moving and manipulation equipment.
5 General requirements
5.1 Operating position and control mode
5.1.1 Operating position
The GD-SCS should have a local and, where deemed required, a remote operating position.
5.1.2 Control mode
The GD-SCS should have the following control modes:
a) manual: manual operation by handle/button/knob/pedal and HMI;
b) emergency: direct operation through hard wire, only for dredging equipment that affects the safety of the grab dredger.