KD Elektronik 151735 Fan failure detector Light grey

Fan failure detection is used to monitor one or two fans that have a hall-output (tacho). AC or DC fans can be monitored, while DC fans with up to 10 A current consumption (for two fans altogether 10 A) can be directly connected. The supply connector of the module is directly connected to the fan connections for this purpose. AC fans must be supplied separately.

Via the DIP switch S2, it can be set for each of the two fan connections, whether or not it is monitored. With another DIP switch S1 the number of echo pulses per revolution dependent on the fan type must be set. The module calculates the speed from the fan's tachometer signal and compares this with a fixed threshold. The module reports when the threshold value is undercut by the alarm contact and a red LED that is present at each of the two fan connections.

The alarm contact (potential-free changeover contact) is operated in such a way that it is tightened in error-free mode and falls off in case of an error or voltage failure. An error occurs when the speed threshold for min. at a monitored fan connection. Is below 10 seconds. If the error is no longer present, the alarm contact is reset. The monitoring of the fans is only activated 10 seconds after the supply voltage is switched on. The alarm contact is activated during this startup time.

This text is machine translated.