Westermo MDW-45 User Manual
User Guide
6617-2203
MDW-45
Westermo Teleindustri AB
©
Converter
RS-232 – RS-422/485
www.westermo.com
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6617-2203
Legal information
The contents of this document are provided “as is”. Except as required by applicable
law, no warranties of any kind, either express or implied, including, but not limited to,
the implied warranties of merchantability and fitness for a particular purpose, are made
in relation to the accuracy and reliability or contents of this document. Westermo
reserves the right to revise this document or withdraw it at any time without prior
notice.
Under no circumstances shall Westermo be responsible for any loss of data or income
or any special, incidental, and consequential or indirect damages howsoever caused.
More information about Westermo can be found at the following Internet address:
http://www.westermo.com
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Safety
!
!
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.
Hazardous voltage may occur within this unit when connected to power supply
or TNV circuits.
Prevent access to hazardous voltage by disconnecting the unit from power supply
and all other electrical connections.
Prevent damage to internal electronics from electrostatic discharges (ESD) by
discharging your body to a grounding point (e.g. use of wrist strap).
Before installation:
This unit should only be installed by qualified personnel.
This unit should be built-in to an apparatus cabinet, or similar, where access is
restricted to service personnel only.
The power supply wiring must be sufficiently fused, and if necessary it must be
possible to disconnect manually from the power supply. Ensure compliance to
national installation regulations.
This unit uses convection cooling. To avoid obstructing the airflow around the unit,
follow the spacing recommendations (see Installation section).
Care recommendations
Follow the care recommendations below to maintain full operation of unit and to fulfil
the warranty obligations.
This unit must not be operating with removed covers or lids.
Do not attempt to disassemble the unit. There are no user serviceable parts inside.
Do not drop, knock or shake the unit, rough handling above the specification may cause
damage to internal circuit boards.
Do not use harsh chemicals, cleaning solvents or strong detergents to clean the unit.
Do not paint the unit. Paint can clog the unit and prevent proper operation.
Do not expose the unit to any kind of liquids (rain, beverages, etc). The unit is not water-
proof. Keep the unit within the specified humidity levels.
Do not use or store the unit in dusty, dirty areas, connectors as well as other mechanical
part may be damaged.
If the unit is not working properly, contact the place of purchase, nearest Westermo dis-
tributor office or Westermo Tech support.
Maintenance
No maintenance is required, as long as the unit is used as intended within the specified
conditions.
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Agency approvals and standards compliance
Type Approval / Compliance
EMC EN 61000-6-2 Immunity industrial environments
EN 55024 Immunity IT equipment
EN 61000-6-3 Emission residential environments
FCC part 15 Class B
EN 50121-4 Railway signalling and telecommunications apparatus
IEC 62236-4 Railway signalling and telecommunications apparatus
Safety EN 60950 IT equipment
Ex* EN 60079-0 and EN 60079-15 Explosive atmospheres – General requirements and type
* Only MDW-45 LV EX
"n" electrical appratatus
FCC Part 15.105 Notice: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio
or television reception, 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 antenna.
… Increase the separation between the equipment and receiver.
… Connect the equipment into an outlet on a circuit
different from that to which the receiver is connected.
… Consult the dealer or an experienced radio/TV technician for help.
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ATEX Information (Applicable for MDW-45 LV EX only)
General
This unit is intended for use in Zone 2 hazardous location only.
Marking
II 3 G
Ex nA IIC 136°C (T3) Gc
SPECIAL CONDITION
WARNING – DO NOT SEPARATE WHEN ENERGIZED
Indicate that this unit complies with relevant European standards that are
harmonised with the 94/9/EC Directive (ATEX).
II
3
G
Ex Indicates that this unit is in conformity with relevant European Ex standard(s).
nA
IIC Gas group, a typical gas i hydrogen.
136°C (T3)
Gc
SPECIAL
CONDITION
Equipment group II.
This unit can be installed in all places with an explosive gas atmosphere other
than mines susceptible to firedamp.
Equipment category 3.
A category is the classification according to the required level of protection.
This unit ensures the requisite level of protection during normal operation
and is intended for use in areas in which explosive atmosphere caused by
gases, vapours, mists, or dust mixtures are unlikely to occure or, if they do
occure, are likely to do so only infrequently and for a short periode only.
Indicates protection concerning explosive atmospheres caused by gases,
vapours or mists (G).
The type of protection used.
This unit is a non-sparking device "nA" which is constructed to minimize
the risk of occurence of arcs or sparks capable of creating an ignition
hazard during conditions of normal operation.
Maximum surface temperature assigned = 136°C with the next highest
temperature class T3 (T3 = 200 °C).
This unit is classified in accordance with its maximum surface temperature
(external and internal).
Equipment protection level Gc (EPL Gc)
Equipment for explosive gas atmospheres, having a "enhanced" level of protection, which is not a source of ignition in normal operation and which may have
some additional protection to ensure that it remains inactive as an ignition
source in the case of regular expected occurences. EPL Gc are analogous to
the ATEX Categories (Category 3 G = EPL Gc).
This unit has a special condition for safe use.
The special conditon for safe use contains safety related information that is
necesarry for the correct installation and safe use.
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Ratings and safety control drawing
Power 12 – 48 VDC; 95 mA
Ambient temperature –40ºC ≤ Ta ≤ +70ºC
Maximum surface temperatur 136 ºC (temperatur class T3)
Degree of protection IP21
Installation spacing Minimum 25 mm above / below and minimum 10 mm left / right
RS-232
Position Direction* / description Input /Output values
1 Not connected
2 Out / Received Data (RD)
3 In / Transmitted Data (TD)
4 Not connected
5 – / Signal Ground (SG)
6 Out / Data Set Ready (DSR)
7 In / Request To Send (RTS)
8 Out / Clear To Send (CTS)
9 Not connected
RS-422/485
Position Direction* / description Input /Output values
1 In / R+ line RS-422 U
2 In / R– line RS-422
3 In / Out / T+ line RS-422/485
4 In / Out / T– line RS-422/485
U
= ± 12 Vpk
max
I
= ± 60 mA
max
Data rate:
1.2 – 115.2 kbit/s
= ± 5 Vpk
max
I
= ± 250 mA
max
Data rate:
1.2 – 115.2 kbit/s
Power – LV
Position
Galvanically isolated via power transformer and optocoupler.
Capacitively isolated via Y1 capacitor rated 440 Vrms 3300 pF.
Direction* /
description
1 In / COM
2 In / +VA
3 In / +Voltage B
4 In / Common
Intput values
Uin = 9.6 – 57.6 VDC
Maxin = 0.16 A @ 9.6 VDC
PIn = 2 W
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