Elvaco CMeX20w Manual

CMeX20w
External MCM for ABB B21/B23/B24, Wireless M-Bus
INTRODUCTION
CMeX20W enables ABB electricity meters with IR interface to
communicate via Wireless M-Bus. The communication is automatically
configured 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
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 qualified 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
off 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.
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
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 configured 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 off for 500 ms) every time a
wireless message is sent.
When a meter change is performed, the CMeX20W is automatically
configured. Wait for green or yellow LED to light up which indicates that
CMeX20W has contact with the new meter.