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Variable air volume controllers
MP-Bus operation – VAV / CAV operation
Connecting cable
The connection to the MP-Bus is made using the connecting cable mounted to the
VAC-Compact device.
Note
– Supply via safety isolating transformer!
– Connections 1 and 2 (AC/DC 24V) and
5 (MP signal) must be routed to accessible
terminals (room temperature controller, floor
distributor, control cabinet, etc.) in order to enable
access with the tools for diagnostic and service
work.
!
Wiring diagrams
Control via MP-Bus
For detailed information, see section «MP-
Bus integration»
MP-Bus control with integrated switch
For detailed information on sensor
integration, see section «MP-Bus
integration»
Note
– For further information about the connection,
override controls, MP-Bus cables, etc., see section
«MP-Bus integration»
– This is a connection description. Depending on the
application, the terminal allocation may vary. The
connection and commissioning must be carried out
by trained personnel.
PC-Tool
ZTH-GEN
..MV-D3-MP
~
T
+
_
U
Y
AC 24 V
T
~
2 3
1
5
MP
– + DC 24 V
PC-Tool
ZTH-GEN
..MV-D3-MP
~
T
+
_
U
Y
AC 24 V
T
~
2 3
1
5
MP
– + DC 24 V
*)
*) e.g. window contact
MP address:
1 … 8
No. Designation Wire colour
Function
1
T –
black
– T
AC/DC 24V supply
2
+ ~ red
~ +
3
Y white
Input for
– Sensor interface
– Override control
5
U orange
MP-Bus connection
MP address:
1 … 8
Dimensioning of supply and connecting cable
General
In addition to the actual wire sizing, attention must also be paid to the surrounding area and
the cable routing.Signal cables must not be laid in the vicinity of load cables, objects liable to
cause EMC interference etc. if possible. Paired or layer stranded cables improve immunity to
interference.
24 V supply, dimensioning and cabling
The dimensioning and installation of the AC 24V supply, the fuse protection and the cables
are dependent on the total operated load and local regulations. Account must be taken of
the following performance data, including the starting currents of the actuators:
– Dimensioning values VAV-Compact controller, see Technical data
– Dimensioning values of further controlling elements etc. can be found in the current data
sheets and product information
– Other devices which are intended to be connected to the same 24 V supply
– Reserve capacity for subsequent expansion, if planned.
MP-Bus integration – supply, dimensioning
and cabling
See S4-VAV-Compact D3, MP-Bus integration
