Elvaco CMeX10 Manual

CMeX10/11
DIN-mounted M-Bus master for 32-64 unit loads

INTRODUCTION

The CMeX10/CMeX11 is an M-Bus Master which can drive up to
64 M-Bus slaves. For a complete description of the product or for
information in Swedish, visit the Elvaco AB website, www.elvaco.com.

OVERVIEW

MOUNTING

The product is mounted on a DIN-rail. The DIN-lock (3) on the bottom is
used to mount and demount the unit from the DIN-rail. To fully comply
with safety regulations, a DIN-rail enclosure must cover the terminals.

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 needs to be connected by a clearly marked
and easily accessible switch to make sure the device can be switched
off during service work. The switch must comply with IEC 60947-1 and
60947-3. The main supply is connected to screw terminal (5) and (6).
Main supply voltage should be in the range of 100-240 VAC, 50/60 Hz.

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 , e.g. a standard telephone cable (EKKX 2x2x0.5) to
2
connect the wiring to the M-Bus connector (2). If a stranded cable is
used, a solid wire connection cable might be needed. Do not exceed the
maximum cable length of 1000 m.
All equipment connected to the M-Bus must have double or reinforced
insulation from mains to prevent the risk of electric shock.

IMPORTANT

• CMeX10/CMeX11 handles up to 32/64 slaves. Overloading the bus
will turn on the ERR LED and turn off the M-Bus.
• All connected M-Bus slave devices must use a unique primary or
secondary M-Bus addresses depending on addressing mode.
1. Serial number
2. M-Bus connector
3. DIN-rail lock

IR INTERFACE

4. IR interface
The IR interface can be used with an ABB electricity meter or another
5. Power supply N
CMeX module. Remove the IR shield (4) and mount the CMeX10/
6. Power supply L
CMeX11 on the left side of the other unit. Leave no space between the
7. Power LED (Green)
products. Do not remove the shield unless the IR interface is used.
8. Error LED (Red)

TROUBLESHOOTING

9. RX LED (Yellow)
All LEDs are permanently off
10. TX LED (Yellow)
There is a problem with the supply voltage. Please verify 100-240 VAC. If
the problem persists, the product may be malfunctioning.
Red LED is permanently on
This indicates an error on the M-Bus 2-wire bus. Please verify no short-
circuit of the bus. The voltage of the bus should be between 21 VDC and
42 VDC.
Cannot read connected M-Bus slaves
Please verify M-Bus status:
•
•
•
TX LED is permanently on
When CMeX10/CMeX11 is stacked with other CMeX10 Series modules
and there is a short circuit on a product which is mounted on the left side
of the issued product, the TX LED may be permanently on. Verify left
side mounted products for no short circuit.

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.
Voltage over M-Bus slave device should be between 21 VDC and
42 VDC.
All M-Bus slave devices must have unique secondary or primary
M-Bus addresses depending on addressing mode.
M-Bus slave device baud rates.