Westermo RD-48 - Manual (Page 16)

16 6153-2004
1. Introduction
The RD-48, is an industrial repeater for RS-422/485 buses. It can also be used as
an converter between 2- and 4-wire systems or as an isolator to protect for example
a PLC from transients or overvoltage.
The standard RS-422/485 bus supports 32 nodes at a distance of 1200 meters.
The RD-48 gives you another 31 nodes and further max.1200 meters. The RD-48
is designed to be mounted on a standard 35 mm DIN-rail.
2. Safety
General:
Before using this unit, read this manual completely and gather all information on
the unit. Make sure that you understand it fully. Check that your application does
not exceed the safe operating specifications for this unit.
Before installation, maintenance or modification work:
Prevent damage to internal electronics from electrostatic discharges (ESD)
by discharging your body to a grounding point (e.g. use of wrist strap).
Prevent access to hazardous voltages by disconnecting the unit from AC/DC
mains supply and all other electrical connections.
Installation:
This unit should only be installed by qualified personnel.
This unit should only be installed in a “restricted access area”, for example
a lockable cabinet where access is restricted to service personnel only.
This unit is intended for permanent connection to the AC/DC mains supply.
The power supply wiring must be sufficiently fused, and if necessary it must be
possible to disconnect manually from the AC/DC mains supply. Ensure compliance
to national installation regulations.
Unit with the rated voltage exceeding 42.4 V peak or 60 VDC, is defined as class I
equipment with a protective earthing conductor terminal.
Unit with the rated voltage up to 42.4 V peak or 60 VDC, is defined as class III
equipment and shall be separated from hazardous voltage by double or reinforced
insulation.
This unit uses convection cooling. To avoid obstructing the air flow around the
unit, follow the spacing recommendations (see under chapter Installation).
3. Approvals
Conformity with the Directive 2006/95/EC (Low Voltage Directive) has been assessed by
application of the standard EN 60950-1.
Conformity with the Directive 2004/108/EC (Electromagnetic compatibility)
has been assessed by application of standards EN 61000-6-2 (industrial immunity)
and EN 61000-6-3 (residential emission).