Monitoring of smoke extraction fans
Function monitors should be installed for smoke extraction fans that must run without motor protection, and possibly until they fail, in the event of a fire.
The use of auxiliary contacts on motor contactors for functional monitoring is not recognised by TÜV because the fan power supply line could also be interrupted. The use of a current monitoring system with the undercurrent function clearly detects whether or not the smoke extraction fan is actually running. If the current being drawn by the fan falls below the threshold, this clearly signals that the fan is not running.
– Detection of fan and system faults without sensors
– Fire protection function
– Compact unit and good value