NMQB24-SRV-ST
Fast-running damper actuator for VAV and CAV units
22 / 28 Product information S4-VRP-M VAV • en • v2.0 • 11.2006 • Subject to changes www.belimo.eu
Product features
Simple direct mounting
Simple direct mounting on the damper spindle with a universal spindle clamp, supplied with an
anti-rotation strap to prevent the actuator from rotating.
Manual control
Manual operation with self-resetting pushbutton.
The position calculation is synchronised in order to prevent deviations as a result of manual
control. This synchronisation also permits a simple functional check (see «Synchronisation»
below).
Adjustable angle of rotation
Caution!
Adaptation is necessary when the system is
commissioned or whenever the end stops for angle
of rotation limiting are adjusted (press the push-
button twice).
The angle of rotation is adapted to the available setting range by the manufacturer of the damper by
means of integrated, mechanical end stops.
Permissible range: 63 ... 100%.
Adaptation to the available angle of rotation
This function detects the upper and lower spindle end stops and stores them in the actuator. The
running time and the working range are adapted to the available angle of rotation. Detection of
the mechanical end stops enables a gentle approach to the end position and protects the actua-
tor and damper mechanisms.
Synchronisation
The actuator moves into the «CLOSED» position (left or right end stop, depending on the posi-
tion of the direction of rotation switch) when the supply voltage is switched on, in the event of a
power failure >5 s or if the pushbutton is actuated again. It then moves into the position required
by the system.
Functional check
Correct functioning of the dampers can be checked extremely easily: The gearing latch can be
disengaged simply by pressing a pushbutton on the housing. As long as the pushbutton remains
pressed, the damper can be operated manually.
High functional reliability
The actuators are overload-proof, require no limit switches and automatically stop when the end
stop is reached.
Electrical installation
The ready-to-connect actuator unit is connected to the VRP-M controller with the 6-pin plug.
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