Elvaco CMeX20w User manual

INTRODUCTION
CMeX20W enables ABB electricity meters with IR interface to
communicate via Wireless M-Bus. The communication is automatically
congured between CMeX20W and the ABB meter. CMeX20W allows
transmission of meter values from the ABB meter via a standardized
interface that can be handled by all receivers on the market that
complies with the M-Bus standard.
OVERVIEW
1. DIN lock
2. Antenna connection
3. Serial number
CMeX20W
4. Power supply L
5. Power supply N
6. IR interface
7. LED
8. Push button
MOUNTING
CMeX20W should be mounted on a DIN rail, on the left side of the
ABB electricity meter. The metallic clip on the bottom is used to mount
and demount the unit from the DIN-rail. For safety reasons, a DIN-rail
enclosure must cover the terminals.
If assembling the CMeX20w in an OVC 3 environment, it is required to
install an external surge arrester in front of the product.
CMeX20W should be equipped with an antenna mounted on the
SMA connector (2). The included mini stub antenna works in most
installations. However, if the CMeX20W is mounted in a metal cabinet, it
may require an external antenna that can be ordered from Elvaco.
POWER SUPPLY
The installation should be performed by a qualied electrician or an
installer with the required knowledge. The power supply must be
protected with a maximum 10 A circuit breaker of characteristic C or
slow blow fuse. The power supply should be connected via a clearly
marked, easily accessible and nearby switch so the unit can be switched
o during service work.
Main supply should be connected to screw terminals (4) and (5). Main
supply voltage should be in the range of 220-240 VAC, 50 Hz.
OPERATION AND FUNCTION
After power up, the CMeX20W will try to communicate via the IR
port with the electricity meter that is mounted on the right side of the
product. Before communication is established with the meter, the LED
(7) lights up red. In this mode, no wireless M-Bus messages are sent from
CMeX20W.
CMeX20W can be congured to either send encrypted or unencrypted
messages. By pressing the push button (8) for at least 5 seconds, the
transmission is changed between encrypted and unencrypted mode. In
encrypted mode, the LED (7) lights up yellow and in unencrypted mode,
the LED lights up green.
CMeX20W uses the Wireless M-Bus mode T1. The product supports
both encrypted and unencrypted messaging. Encrypted mode means
that the Wireless M-Bus messages are protected with a 128 bit AES key.
When CMeX20W has created a connection to the electricity meter, the
LED changes color from red to green in unencrypted mode, and yellow
in encrypted mode. The CMeX20W now starts to send readings once
every 16 seconds. The LED flashes (turns o for 500 ms) every time a
wireless message is sent.
When a meter change is performed, the CMeX20W is automatically
congured. Wait for green or yellow LED to light up which indicates that
CMeX20W has contact with the new meter.
CMeX20w
External MCM for ABB B21/B23/B24, Wireless M-Bus

© 2024, Elvaco AB. All rights reserved. The documentation and product are provided on an “as is” basis only and may contain deciencies or inade-
quacies. Elvaco AB takes no responsibility for damages, liabilities or other losses by using this product. No part of the contents of this manual may be
transmitted or reproduced in any form by any means without the written permission of Elvaco AB. Printed in Sweden.
CMeX20W Quick manual A4 English
Document id: 1090093
Version: 4.1
TROUBLESHOOTING
Red LED is on, no wireless messages are sent
This may be due to the following:
• ABB meter is not powered up.
• The distance between CMeX20W and the electricity meter is too
long.
• The ABB meter is congured incorrectly or is of the wrong type.
CMeX20W works on max 9600 baud.
The master does not receive any telegram from the product
This may be due to the following:
• The CMeX20W or ABB meter is not powered up.
• The antenna on CMeX20W is not installed correctly, or an external
antenna is required to reach the receiver.
• The receiver is not congured correctly, mode T must be selected.
• The antenna on the receiver is not optimally positioned.
LED INDICATIONS
LED Description Visual
O Power supply is not connected
Red steady on CMeX20W has no contact
with electricity meter, no
messages are sent.
Green
Short dip
Normal operation
unencrypted mode.
Wireless telegram is sent.
Yellow
Short dip
Normal operation encrypted
mode.
Wireless telegram is sent.
Yellow flashing
Short dip
The ABB electricity meter’s
telegram is too large to t
in the encrypted wireless
telegram. The telegram is sent
wirelessly but up to nine byte
may have been truncated
at the end of the meter’s
telegram.
Wireless telegram is sent.
SAFETY
The warranty does not cover damage to the product caused by usage in
any other way than described in this manual. Elvaco AB can not be liable
for personal injury or property damage caused by usage in any other way
than described in this manual.
Mechanics
Protection class IP20
Mounting Mounted on DIN rail (DIN 50022) 35 mm
Electrical connections
Supply voltage Screw terminal. Cable 0.25-1.5 mm²
Electrical characteristics
Nominal voltage 220-240 VAC (+/- 10%)
Frequency 50 Hz
Power consumption (max) <2.5 W
Power consumption (nom) <1 W
Installation category OVC 3 (incl surge arrester)
OVC 2
User interface
Green LED Power
Red LED Error
Orange LED Encrypted mode
Push button Conguration/activation
M-Bus
M-Bus information All elds in the rst telegram of the electricity
meter
Integration
Meter implementation ABB meters with IR interface
Maximum number of connected
meters 1
Factory default
Transmit interval 16 seconds
Encryption mode Optional unencrypted/encrypted
(128 bit AES)
Product Item number Description
CMeX20W 1050069 External MCM for ABB B21/B23/
B24, Wireless M-Bus
ORDERING INFORMATION
CONTACT INFORMATION
Elvaco AB Technical support:
E-mail: [email protected]
www.elvaco.se/en
TECHNICAL SPECIFICATIONS
SIMPLIFIED DECLARATION OF CONFORMITY
Hereby, Elvaco declares that the product is in compliance with the
following directives:
EU:
- 2014/30/EU (EMC)
- 2014/35/EU (LVD)
- 2014/53/EU (RED)
- 2011/65/EU + 2015/863 (RoHS)
UK:
- 2017No. 1206
- 2016No. 1091
- 2016 No. 1101
- 2012 No. 3032
The complete Declaration of Conformity can be found at www.elvaco.
se/en > Search on product or item number.