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CHAPTER 1: BEFORE YOU START
Regulatory compliance information
CE Mark compliance
Product overview
Product design
D20MX INSTRUCTION MANUAL
The D20MX is rated as CISPR 11 Group 1 Class "A" equipment.
To meet essential safety requirements of the LV Directive 2006/95/EC, the D20 chassis
must be installed in a secondary cabinet if an operating voltage on any of the terminals is
equal to or higher than 50 VAC or 75 VDC. Proper wiring practices and applicable local
safety standards defining protection against electrical shock must be followed at all times.
To provide higher EMC immunity and maintain CE Mark compliance, the serial cables used
for permanent RS-232 and RS-485 connections must comply with the following
requirements:
•
Cables must be shielded
•
D type connector covers must provide EMC shielding (e.g., metallized plastic or die
cast metal covers) for permanently connected RS-232 cables
Class "A" equipment is intended for use in an industrial environment. The equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with these instructions, may cause interference to other devices in the vicinity.
If this equipment does cause interference with other devices, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
•
Reorient or relocate the receiving device
•
Increase the separation between the equipment
•
Connect the equipment into an outlet on a circuit different from that to which the
other device(s) is connected
•
Consult the manufacturer or field service technician for help
The D20 is a standalone remote terminal unit (RTU). It consists of a D20MX processor
board, power supply, optional termination panels, and optional communications
equipment in a 3U tall, 19-inch wide chassis. These components, combined with software
applications running on the D20MX, form the D20 RTU System.
The D20 acts as a data concentrator and central processor. Field data gathered through
the peripheral modules and external Intelligent Electronic Devices (IEDs) are stored in the
system database and can be accessed by the application programs loaded on the D20.
The D20 design has horizontally mounted processor boards, with multiple boards in some
versions.
Peripheral I/O boards operate independently of the main chassis and D20MX processor
board. This means that you can use a D20 without direct connection to peripheral boards
so that it acts as a master data concentrator to other RTUs. You can also hot-swap the
peripherals without powering down the main processor. For information on peripheral
modules, see the D20/D200 Installation and Operations Guide (part number 994-0078); see
section: Connections and Configuration.
GE INFORMATION
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