8.5.2 Setting variable operation (V)
The factory-set values for q
vmin
and q
vmax
can be
adjusted on the internal display or using the service
tools described.
q
vmin
to q
vmax
is the variable-limited volume flow rate
operating range, which is controlled by the control signal
at terminal Y.
The following points should be noted for the control
input signal:
Usable control range of the VAV terminal unit 4%–
100%
The settings q
vmin
und q
vmax
define the controllable
operating range of the control component,
In order to achieve a higher resolution of the assign-
ment voltage signals to the volume flow rate setpoint
values, the operating range can be restricted by
q
vmin
und q
vmax
.
8.5.2.1
Setting the entire control range for the
control input signal of the central building
management system
If the volume flow rate is to be specified by the central
BMS across the entire control range, q
vmin
must be set
to 0 m³/h and q
vmax
to q
vnom
.
The following points should be noted for the control
input signal:
Observe the usable control range
For example, with a signal voltage range of
0 – 10 V DC and settings of q
vmin
= 0 m³/h and q
vmax
= q
vnom
, the control range is only reached from a
control signal of 0.4 V DC.
If the control signal drops below 0.3 V DC with a
control input signal of 0 – 10 V and q
vmin
= 0, the
damper blade moves to the CLOSED position.
NOTICE!
Safe shut-off function
Compliance with a control signal
≤
0.3 V DC is not
always given due to interference voltages on the
supply lines. Therefore, the positive circuit should
always be preferred for a safe shut-off,
8.5.3 Change of the control input signals
analogue 0 – 10 V, 2 – 10 V, Modbus
In menu item
❺
, the control input signal of the control
component can be adjusted as follows.
tion and status of the control component’ on page 23
Cb2
- Modbus
CA0
- Analogue 0 – 10 V – variable operation (V) or
constant value operation (F)
CA2
- Analogue 2 – 10 V – variable operation (V) or
constant value operation (F)
Commissioning and operation
Setting of the control component > Change of the control input signals analogue 0...
Control component Compact XM0 • XS0 for VAV terminal unit TVE
29
