Variable air volume controllers
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55
CAV – Step mode CLOSED /
min /
mid /
max / OPEN
CAV control
Three options are available for the CAV control:
– Standard 0.1 V shut-off: CLOSED –
min –
max – OPEN (default setting)
– Standard 0.5 V shut-off: CLOSED –
min –
max – OPEN
– Old Generation (NMV-D2M): CLOSED –
min –
mid –
max – OPEN
Wiring diagrams
a b c d e
T
..MV-D3-MP
~
T
+
_
U
Y
AC 24 V
DC 24 V *
T
_
~
+
2 3
1
5
PC-Tool
ZTH-GEN
* Not available with DC 24 V supply.
CAV function: Standard
Mode
setting
–
0 … 10 V 0 … 10 V 0 … 10 V 0 … 10 V
2 … 10 V 2 … 10 V 2 … 10 V 2 … 10 V 2 … 10 V
Signal
T
0 … 10 V ~
~
~
–
2 … 10 V
+
Function
3
3
3
3
3
Damper
CLOSED
a) CLOSED
c) CLOSED
*
min
...
max
b)VAV
CAV –
min
All open –
min
active **
Damper
OPEN
e) OPEN
*
CAV –
max
d)
max
Legend
Contact closed, function active
Contact closed, function active, only in 2 ... 10 V mode
Contact open
* Not available with DC 24 V supply
** The damper is closed when the 0.5 V shut-off level is used.
Example:
CAV application CLOSED –
min –
max
(mode 2 … 10 V)
PC-Tool
ZTH-GEN
..MV-D3-MP
~
T
+
_
U
Y
AC 24 V
DC 24 V
T
_
~
+
2 3
1
5
a
d
Note
In order to use the CAV step
mid
, the Old
Generation (NMV-D2M) CAV function must
be selected.
CAV function: Old Generation (NMV-D2M)
Mode
setting
–
0 … 10 V 0 … 10 V 0 … 10 V 0 … 10 V
2 … 10 V 2 … 10 V 2 … 10 V 2 … 10 V 2 … 10 V
Signal
T
0 … 10 V ~
~
~
–
2 … 10 V
+
Function
3
3
3
3
3
Damper
CLOSED
a) CLOSED
min
...
max
b)VAV
CAV –
min
All open –
min
active
Damper
OPEN
e) OPEN
*
CAV –
max
d)
max
CAV –
mid
c)
mid
*
Legend
Contact closed, function active
Contact closed, function active, only in 2 ... 10 V mode
Contact open
* Not available with DC 24 V supply
Example:
CAV application
min –
mid –
max
(Mode 0 … 10 or 2 … 10 V)
PC-Tool
ZTH-GEN
..MV-D3-MP
~
T
+
_
U
Y
AC 24 V
T
~
2 3
1
5
c d
VAV reference signal
MP / Actual value signal
0 … 10V / 2 … 10V
Damper CLOSED
CAV step
min
CAV step
max
CAV step
min
CAV step
mid
CAV step
max
MP / Actual value signal
Setting CAV function:
Standard (Default)
MP / Actual value signal
Setting CAV function:
Old Generation (NMV-D2M)
