Westermo MD-45 AC, MD-45 HV, MD-45 LV User Manual

Converter RS-232 – RS-422/485

INSTALLATION MANUAL

6157-2213

www.westermo.us

MD-45 AC

MD-45 LV/HV

Westermo Teleindustri AB • 2003 • REV.A

Galvanic

Isolation

Transient

Protection

Balanced

Transmission

Approved

2 6157-2213

Contents

1. Introduction ............................................................................................................................................................... 3

2. Safety .................................................................................................................................................................................. 4

3. Approvals ....................................................................................................................................................................... 4

3.1 Declaration of conformity ........................................................................................................................ 5

4. Specifications ............................................................................................................................................................ 6

4.1 Interfaces ............................................................................................................................................................... 6

4.2 Insulation between interfaces ................................................................................................................ 6

4.3 Climatic environment .................................................................................................................................. 7

4.4 Mechanics .............................................................................................................................................................. 7

5. Maintenance .............................................................................................................................................................. 7

6. Installation ................................................................................................................................................................... 8

6.1 Mounting /Removal ........................................................................................................................................ 8

6.2 Connections ......................................................................................................................................................... 9

6.2.1 LED indicators ........................................................................................................................................ 9

6.2.2 Power (MD-45 HV,AC) ................................................................................................................. 10

6.2.3 Power (MD-45 LV) ............................................................................................................................ 10

6.2.4 Line connection (RS-422/485) ................................................................................................. 10

6.2.5 Terminal connection (RS-232, DCE) .................................................................................. 10

6.3 Configuration ................................................................................................................................................... 11

6.3.1 DIP switch settings ................................................................................................................. 11–12

7. Functional description .............................................................................................................................. 13

7.1 Block diagram ................................................................................................................................................. 13

7.2 2 Line connection ......................................................................................................................................... 14

7.3 Hints ....................................................................................................................................................................... 14

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1. Intruduction

The MD-45 is used to convert between RS-422/485 and RS-232/V.24 signals.This device is often used in multidrop applications connected to a PC or PLC.

In 2-wire half duplex applications (RS-485) the direction of the bus can be controlled by data which means that the converter turns the bus depending on the data sent on the bus. This makes it possible to use the unit with equipment that has no handshaking signals.The maximum transmission rate possible is 115.2 kbit/s.

123456789123456789

R+ R- T+ T- T+ T- R+ R-

CHANNEL 3

LD-01 DC

PWR

DCD2

DCD3

DCD4

CHANNEL 2 POWER

123456789123456789

CHANNEL 4

R+ R- T+ T- T+ T- R+ R-

CHANNEL 3

LD-01 DC

PWR

DCD2

DCD3

DCD4

CHANNEL 2 POWER

CHANNEL 4

123456789123456789

R+ R- T+ T- T+ T- R+ R-

CHANNEL 3

LD-01 DC

PWR

DCD2

DCD3

DCD4

CHANNEL 2 POWER

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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 73/23/EEC (Low Voltage Directive) has been assessed by application of the standard EN 60 950. Conformity with the Directive 89/339/EEC (Electromagnetic compatibility) has been assessed by application of standards EN 61000-6-2 (industrial immunity) and EN 61000-6-3 (residential emission).

56157-2213

3.1 Declaration of conformity

Westermo Teleindustri AB

Declaration of conformity

The Westermo Teleindustri AB company declares that the listed products conforms to the Council Directive 89/336/EEC, related to Electro Magnetic Compability and 72/23/EEC Low Voltage Directive.

Type of equipment: Model:

DIN-rail converter RS232-RS422/485 MD-45 AC 3157-0101, 3157-0110 MD-45 HV 3157-1101 MD-45 LV 3157-0001

Standards:

EMC: EN 61000-6-3/CISPR22(EN 55022): Class B

EN 61000-6-2/EN 61000-4-2 EN 61000-6-2/EN 61000-4-3 EN 61000-6-2/EN 61000-4-4 EN 61000-6-2/EN 61000-4-5 EN 61000-6-2/EN 61000-4-6 EN 61000-6-2/EN 61000-4-11 EN 61000-6-2/EN 61000-4-16

Safety: EN 60950

Reference: Installation manual MD-45 AC/HV,LV Art. Nr. 6157-2003

Hans Levin Technical Manager May 2003

Postadress/Postal address Tel. Telefax Postgiro Bankgiro Corp. identity number Registered office

S-640 40 Stora Sundby 016 - 42 80 00 016 ñ 42 80 01 52 72 79-4 5671-5550 556361-2604 Eskilstuna

Sweden Int +46 16 42 80 00 Int +46 16 42 80 01

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