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Operating Instructions
1.
Safety Information
Ensure ESD protection.
Avoid short-circuits on the PCB.
Always route connecting cables through the grom-
mets of the meter.
Do not cut the grommets shorter than necessary
since this may lower the degree of protection.
Disconnect the M-bus voltage during connection
work.
2.
Description of functions
The M-bus module is an add-on module for the type UH50..;
Firmware ≥ 5.15
and UC50.. .
The module enables the meter to communicate with an M-bus
center in order to transmit measured values.
These modules are available in 2 types:
•
M-bus module G4 (WZU-MB G4)
•
M-bus module with pulse inputs (WZU-MI) for connection of
pulse generator
Siemens Smart Infrastructure
M-bus module WZU-MB G4, WZU-MI
3.
The meter has two module slots for additional modules.
Number
1
2
3
4
5
For connection with the M-bus master or M-bus repeater, 2
flexible cables with a conductor cross-section of 0.25 mm
0.75 mm
core line.
The outer diameter of the cable must be between 4 mm and 6
mm. All cables have to be routed through the existing bush
sleeves "a" or "b" in the meter. It may be convenient to connect
the cables before the meter in a single multi-conductor cable
on a splitting box.
Installing the communication module
The communication modules are connected via a 6-pole reac-
tion-free connector so that installation or replacement is possi-
ble at any time.
To install a communication module proceed as follows:
•
•
•
•
•
•
A6V12318596_----_a
Installation and assembly
Description
Service button (under the housing cover)
Slot "module 1"
Slot "module 2"
Bushing for power cable
Bush sleeves
2
are provided, which are to be combined to a multi-
Press the 4 side lugs of the housing cover inwards and
remove the cover.
Determine the correct slot.
Note: Das WZU-MB G4 module may be fitted on both
slots.
Note: The WZU-MI module can only be used in slot
"module 1".
Put the communication module into the correct position.
Place the communication module carefully in both the guide
slots and push it in.
To connect an external cable, open the sleeve matching
the cross section of the connection cable.
Note: Open the cable sleeves in such a way that they
enclose the cable tightly.
Note: The circuit of the pulse generator and the M-
bus must be galvanically isolated.
Guide the cable through the sleeve from outside.
A6V12318596_----_a
2021.01.28
Translation
2
to
2021-01-28
4
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