4
Operational conditions
This section of the document describes basic recommendations for transportation, storing, installation and operation
of WM868-MS-LP-H radio modules.
4.1
General operational risks
The WM868-MS-LP-H radio-modules are electronic devices powered from an external power source that can be
used for transparent data transfer among the remote segments of M-Bus data bus through the WACO RF network.
During the operation of the modules there are following potential risks:
4.1.1
Risk of mechanical damage
The devices are covered in plastic boxes, so electronic components are not accessible for a direct mechanical damage.
When installing it is necessary to ensure a sufficient space for connecting cables (including the configuration cable)
and also that the cables are as short as possible (especially power and antenna cables). It is necessary to ensure
the proper fastening of the module to DIN-rail with a plastic lock. In normal operation no special precautions are
needed, besides avoiding of the mechanical damage from strong pressure or shocks.
Special attention is required for power, communication/signaling and antenna cables. In operation it is necessary
to ensure that the cables are not stressed by mechanical tension or bending. In the case of damage of any cable
isolation it is recommended to replace the cable immediately. If the module is equipped with a remote antenna
on a coaxial cable, much attention should be paid for the antenna and the antenna cable as well. The minimum
bending radius of the antenna cable with 6 mm diameter is 4 cm, for the antenna cable with the 2,5 mm diameter
the bending radius is 2 cm. Violation of these bending parameters can lead to breach of homogeneity of the coaxial
cable that could cause reducing of radio range of the device. Further it is necessary to ensure that the connected
antenna cable will not stress the antenna connector of the device by tension or twist. Excessive loads can damage
or destroy antenna connectors.
The module is specified for installation in normal internal premises with the temperature range of (-10
÷
+50)
◦
C,
with humidity up to 90% without condensation. Direct installation of the equipment in outdoor areas is not possible.
4.1.2
Risk of electrical damage
Electrical installation of the module can be performed only by a person with necessary qualification in electrical
engineering and at the same time trained for this device installation. The device is powered by DC power with safe
voltage up to 24 V and current consumption up to 200 mA.
The power supply must meet the requirements for the safety protective transformer ˇ
CSN-EN61558-2-6. The module
has an integrated protection against reversing the polarity of the supply voltage. Reversing the polarity is indicated
so that after switching on the supply voltage to the module a green LED
”
PWR” on the front panel does not shine.
Unwanted reversing the polarity of the supply voltage does not lead to damage or destruction of the device. In
addition, the module is on the supply inlet equipped with a irreversible fuse (polyswitch) with the actuating current
of 300 mA and over-voltage protection with 30 V switching level.
The module is not equipped by any disconnecting component – switch. It is suitable to place in installation a
disconnecting component, for example a circuit breaker, which can be inserted into 24V/DC lateral of the supply
or into the 230V/AC side of the supply. The primary side of the power source must be protected by automatically
irreversible fuse.
4.2
The condition of modules on delivery
Modules are delivered in standard cardboard boxes. At standard term of delivery the module does not include the
antenna, the power supply and cables, if required these components must be ordered separately.
4.3
Modules storage
Modules should be stored in dry rooms with a temperature range (0
÷
30)
◦
C.
WM868-MS-LP-H
23
