Siemens SITRANS WM300 MFA Operating Instructions Manual page 70

Technical Reference
A.1 Principles of Operation
The WM300 MFA has a 0 to 399 second time delay feature, allowing the monitored device to
accelerate to normal running speed before monitoring begins.
The time delay feature is activated with the use of input I2. When in use, time delay will
energize the relay outputs and be maintained in a closed state for the duration of the
programmed timer. This feature will prevent a false alarm indication during equipment
startup in slow speed applications.
Input I2 must realize a transition from "Lo - Hi - Lo" in order to initiate the internal timer used
to maintain the output relay closed. If the monitored equipment does not reach normal
operating speed within the set time period, the relays will de-energize creating a failsafe
alarm condition.
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SITRANS WM300 MFA
Operating Instructions, 08/2018, A5E45090709-AA