摘要:
A test stand (100) for calibrating and/or testing a flow meter for a liquid (T), comprises: a) a test line (101) for installation of a flow meter to be tested (T), whereby the test line (101) comprises a supply line (112) for supplying a test liquid to the flow meter to be tested (T) and a discharge line (113) for discharging the test liquid after exiting the flow meter to be tested (T); b) a liquid supply device (111) for delivering the test liquid through the supply line (112); c) a measuring device (120) for determining a quantity, especially a mass and/or a volume, of test liquid flowing through the flow meter to be tested (T); characterized in that d) the test stand comprises a heating device (130) for increasing the temperature of the test liquid before entering the flow meter to be tested (T), and a cooling device (140) for reducing the temperature of the liquid after exiting the flow meter to be tested (T).
摘要:
A method of controlling an HVAC system (10) that comprises least one flow regulator (16), an electromechanical actuator (20), one or more sensors (34) associated with the actuator, and a controller (32) operatively connected with the actuator and with the sensors. The method includes the steps of actuating the flow regulator, receiving signals from the sensors, and determining an actual or forthcoming malfunction based on the signals. It is determined whether the malfunction is in the actuator or the flow regulator.
摘要:
The present disclosure is directed towards a method of controlling opening of a valve (10) in an HVAC system (100). The method includes controlling the opening of the valve (10) according to a default control mode in dependence of a default sensor signal. The method further includes determining, while controlling the opening of the valve (10) according to the default control mode, whether the default sensor signal is faulty and switching, in case of the default sensor signal being faulty, to controlling the opening of the valve (10) according to a fallback control mode, with the opening of the valve (10) being controlled independently of the faulty sensor signal in the fallback control mode. The present invention is further directed towards a corresponding control device opening of a valve (10) in an HVAC system as well as a corresponding computer program product.
摘要:
The present disclosure is directed towards a method of controlling opening of a valve (10) in an HVAC system (100). The method includes controlling the opening of the valve (10) according to a default control mode in dependence of a default sensor signal. The method further includes determining, while controlling the opening of the valve (10) according to the default control mode, whether the default sensor signal is faulty and switching, in case of the default sensor signal being faulty, to controlling the opening of the valve (10) according to a fallback control mode, with the opening of the valve (10) being controlled independently of the faulty sensor signal in the fallback control mode. The present invention is further directed towards a corresponding control device opening of a valve (10) in an HVAC system as well as a corresponding computer program product.
摘要:
A simple and effective volume/pressure relief means (28) is provided at one of said valve members (22′), which volume/pressure relief means (28) establishes a hydraulic relief connection between said first or second valve port (33, 34) and said third valve port (35) of the respective sub-valve (20a or 20b), when said sub-valves (20a, 20b) are in said intermediate position, and is inactive, when said sub-valves (20a, 20b) are in the first or second end positions.
摘要:
Offenbart wird eine Steuerschaltung (1) für einen Sicherheitsantrieb mit einem elektrischen Motor (2) und einer Rücklauffeder (4), wobei die Steuerschaltung (1) dazu eingerichtet ist, eine Frequenz einer im Motor (2) induzierten elektromotorischen Gegenkraft (Gegen-EMK) zu bestimmen und daraus eine Drehzahl des Motors (2) zu bestimmen; und wobei die Steuerschaltung (1) dazu eingerichtet ist, die Drehzahl des Motors (2) während einer durch die Rücklauffeder (4) angetriebenen Rücklaufbewegung durch Ansteuerung des Motors (2) zu regeln oder zu begrenzen. Offenbart werden ferner ein Sicherheitsantrieb mit einer Steuerschaltung (1), ein Verfahren zur Steuerung einer Rücklaufbewegung eines Sicherheitsantriebs sowie ein Computerprogrammprodukt.