IntroductIon
The CMeX30 is a digital to analog converter (D/A module) with an
output voltage range from 0-10 V or current output range from 4-20
mA. The value is set through standard M-Bus commands. CMeX30
has a high accuracy, is reliable and can be used for advanced control
processes. For a complete description of the product or for information
in Swedish, visit the Elvaco AB website, www.elvaco.com.
overvIew
CM
e
X
30
DIN-mounted M-Bus D/A module
1. Serial number
2. M-Bus connector
3. Screw terminal for
4-20mA/0-10V
4. Power supply L
5. Power supply N
6. Status LED (green)
7. Error LED (red)
mountIng
The CMeX30 should be mounted on a DIN-rail. The metallic clip on the
bottom is used to mount and demount the unit from the DIN-rail. DIN-
rail enclosure must cover the terminals.
power supply
The installation must be performed by a qualified electrician or installer
with required knowledge. The power supply should be connected to
screw terminals (4) and (5). The voltage should be 100-240 VAC, 50/60
Hz. The power supply should be connected via a clearly marked switch
placed close to CMeX30, so the unit can be switched off during service
work.
m-Bus 2-wIre Bus
M-Bus is a multi-drop 2-wire bus with no polarity. Use a cable of area
0.25-1.5 mm
2
, e.g. a standard telephone cable (EKKX 2x2x0.5). Connect
the wiring to the connector (2).
ImportAnt
•
All connected M-Bus slave devices must have unique primary or
secondary M-Bus addresses depending on addressing mode.
•
Measure voltage over M-Bus slave connection to verify M-Bus
master connection. Voltage should be between 21-42 VDC.
led IndIcAtIons
The product is equipped with a green and red LED. The green LED
shows the operation status of the product. When the green LED is
permanently on, the product is powered up and ready to use. When the
green LED is flashing, the product is communicating via M-Bus. The red
LED indicates that the M-Bus 2-wire is not properly connected.
green led
Mode
Product state
Visual
On
The unit is in operation
mode
200 ms off/ 200
ms on/200 ms
off/ 200 ms on
The unit has received
M-Bus telegram
red led
Mode
Product state
Visual
On
M-Bus missing
connectIon of output 0-10 v
CMeX30 can be connected to any analog voltage input that can handle
0-10 V. Connect the negative cable (signal GND) to the center terminal
of screw terminal (3), the signal is connected to the right terminal of
screw terminal (3).
