Fan failure detection for monitoring and ensuring fan operation in critical applications

The fan failure detection LFT reliably detects when the speed of connected
AC and/or DC fans is below a preset speed threshold.
The HALL signal of the monitored fan is evaluated by an electronic system for this purpose.
A potential-free contact is then switched via a relay (NO NO contact, NC NC NC contact,
CO changeover contact).
– Speed evaluation of AC and DC fans by means of Hall signal.
– Relay switching functions depending on preset speed thresholds.
– Protection against mechanical and moisture stress thanks to complete encapsulation in the housing.
– The monitoring functions can be selected for specific devices.

Application examples
– Railway
– E-motor fan cooling
– WC ventilation
– Industry and commerce
– Control cabinet climate
– Server cabinets
– Telecommunications
– Signal distribution
– Control cabinets in general

Operation:
– input voltage present
– fan speed greater than 750 min -1
– signal relay K1 energized, terminals 6 and 8 closed Fault status:
– speed less than 750 min -1
– operating voltage, fan and / or electronics missing
– signal relay not energized, terminals 6 and 8 open