Westermo MD-21 AC User manual

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Strömslingeomvandlare
Current loop converter
Stromschleifenwandler
INSTALLATIONSANVISNING
INSTALLATION MANUAL
INSTALLATIONS ANLEITUNG
6151-2002
www.westermo.se
MD-21 AC
MD-21DC
©Westermo Teleindustri AB • 1999 REV. A
Galavanic
Isolation Transient
Protection CE
Approved

86151-2002
Specifications
Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS-232-C/CCITT V.24
9-position D-sub female / screw-terminal
Interface 2 20mA current loop, selectable active or passive
Data rate Up to 19200 bit/s
Indicators Power, RD, TD
Isolation Galvanic isolation with opto-coupler
(data transmission) and transformer (supply)
Isolation voltage 1500V
Overvoltage protection Mains: Breakdown voltage 430V at 230V AC
and 220V at 115V AC*
Interface 2: Breakdown voltage transmitter and
receiver 37V. Surge capacity 0.6 kW for 1 ms
Power supply** 115V*/230V AC +15/-10% 48-62Hz
Fuse 100mA fast 5x20mm
Power consumption Max 4VA at 115V and 230V
Temperature range 5-50° C, ambient temperature
Humidity 0-95% RH, non-condensing
Dimensions 55x100x128 mm
Weight 0.4 kg
Mounting On a 35mm DIN-rail
** For other power supply voltages contact Westermo.
* Only MD-21 115V

96151-2002
Settings MD-21
The MD-21 can through different switch settings be adapted to a variety of running
conditions. To set the switches, open the lid on the top of the plastic case.
WARNING! DO NOT OPEN CONNECTED UNIT
12345
MD-21DC
V24/RS-232-C
CURRENT LOOP
CONVERTER
LINE CONNECTION
-+
103 104
12-36V DC
POWER
R+ R- T+ T-
V24/RS-232-C
CONNECTION
TD RDPWR RTS CTS DCD DSRDTR SG
105 106 109 108 107 102
123456789
S4:1-6 S1:1-6S3:1-6
Inverted Transmitter/Receiver
Receiver active/passive
Factory settings
Trans-
mitter
Normal Normal
Normal
Inverted
Inverted
Inverted
Normal
Inverted
Receiver
S1
S1
S1
S1
Passive
S3
Active
S3
S3
Transmitter active/passive
Passive
S4
Active
S4
S4
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
CTS-control
Always high
S1
S1
RTS
S1
ON
123456
ON
123456
ON
123456
S1: 5-6 not used

Receiver 1 R+
Receiver 2 R-
Transmitter 3 T+
Transmitter 4 T-
5 Shield
10 6151-2002
N 115V*/230V
L AC power
PE/Protective Earth
I 3 8 103 TD/Transmitted Data
O 2 7 104 RD/Received Data
I 7 6 105 RTS/Request To Send
O 8 5 106 CTS/Clear To Send
O 6 2 107 DSR/Data Set Ready
– 5 9 & 1 102 SG/Signal Ground
O 1 4 109 DCD/Data Carrier Detect
NC 4 3
Description
Connections MD-21
Line connection
(5-Position screw-terminal)
MD-21 20mA current loop equipment
Trans-
mitter
Receiver
1
2
3
4
5
R+
R-
T+
T-
T+
T-
R+
R-
Receiver
Trans-
mitter
Shield 1)
Direction No. Description
Power connection (AC)
(3-position screw-terminal)
Line connection MD-21
Terminal connection (DCE)
(RS-232-C/V.24, 9-position D-sub female or screw-terminal)
I=input O=output. MD-21 is a DCE (Data Communication Equipment).
NC=not connected.
Screw
no.
Power
Supply
Direction 1) Pin
no.
Screw
no.
CCITT V.24
Circuit no.
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
* MD-21 115V