Positive lock connection
Fig. 3: Controller with lock connection
1
Shaft with marking for position indication
2
Damper blade
Clamping device (frictional connection)
Fig. 4: Controller with clamping device
1
Shaft with marking for position indication
2
Damper blade
TVE
Fig. 5: TVE controller
1
Shaft with marking for position indication
2
Damper blade
3.4 Function description
Basic function
The Easy controller is an electronic control component
for variable volume flow control for various TROX VAV
terminal units. Its functional units consist of a dynamic
differential pressure transducer, the controller elec-
tronics and the actuator.
Closed control circuit
The controller operates in a closed control circuit:
measure – compare – control.
The determination of the current volume flow rate takes
place by measuring a differential pressure (effective
pressure). For this purpose, the air terminal unit has a
differential pressure sensor. The effective pressure is
forwarded through the measuring hoses or, in the case
of TVE, through the damper blade shaft to the differen-
tial pressure transducer integrated in the control compo-
nent where it is converted into a voltage signal.
The volume flow rate actual value is thus the internal
control loop as well as an external use, e.g. BMS or
master-slave sequential circuit, available as analogue
voltage signal 0
‑
10 V. Due to the factory adjustment, the
maximum output value of 10 V DC always corresponds
to the nominal volume flow rate (q
vnom
) which can be
taken from the scale sticker and the adjustments sticker
on the VAV terminal unit.
The nominal volume flow rate is either set as a constant
value or specified by an analogue voltage signal at the
setpoint value input. The definition of the constant
volume flow rates or of the working range for variable
operation is carried out by the customer via the potenti-
ometers q
vmin
and q
vmax
.
Structure and functional description
Function description
Easy control component for VAV terminal units
12
