Spring-operated "separate function" control mechanism, used in fire ventilation cut-off dampers – current impulse control

In this type of mechanisms, the transition to the safety position is initiated by an electromagnetic release that releases the bolt of the spring drive of the damper., while the transition to the standby position is ensured by an independently powered electromechanical rotary actuator. It is, therefore, a "split-function" mechanism of the safety function from the comfort function of restoring the standby position. During normal operation of the ventilation and air conditioning system, the fire ventilation dampers remain closed. In this state, the spring of the fire ventilation cut-off damper drive remains under tension, thus storing the potential energy necessary to open the damper.. The spring is locked in the waiting position by the bolt, the operation of which is ensured by an electromagnetic release with a strong permanent magnet. Therefore, no control energy is required in standby. Additionally, the bolt is coupled via a lever with a manual trigger. It is possible to move the damper to the safety position in two cases:
– uruchomienia wyzwalacza ręcznego,
– control signal from the CSP – current pulse.

In the case of a signal from CSP – current pulse feeding the electromagnetic release, a magnetic field opposite to the magnetic field of a permanent magnet is created, As a result, the bolt blocking the spring drive of the damper is released. A spring installed directly in the damper guarantees its very quick transition to the safety position. It takes up to a few seconds to open the shut-off blade. Return the hatch to the waiting position – The spring tension of the damper's drive and its closing is possible by supplying power to the electromechanical rotary actuator, the main element of which is an electric motor. This action should follow the activation of the remote-restoration switch from the zone to standby, on which the inspection was carried out or by manually arming these dampers, which are not equipped with the remote recovery standby function. In this way, the obligation to verify by the facility security services each fire hazard signal in place is enforced, from which this signal comes, before the normal functioning of the CSP is restored. For dampers with control mechanisms with separation of functions, there is no need for additional control separation interfaces yes, as for dampers with mechanisms without functional separation. Signaling of the beginning and end of each change of the damper partition position is provided by limit switches, which complement the spring drive of the damper. Due to the need to apply voltage to the electromagnet coil in order to enable the damper to move to the safety position, it is essential that:
– the power supply was realized via a power supply cooperating with a battery of batteries,
– w przypadku gdy przewód łączący sterownik z wyzwalaczem elektromagnetycznym klapy ma większą długość niż 2 the connection was monitored.