Why Do I Need A Tattletale®?
Tattletale® annunciators and Magnetic Switches are the nerve centers that translate Swichgage® contact operations into decisions and operate the alarm or shutdown device. They are the electrical load carrying devices for the alarm or shutdown device. Tattletale® annunciators indicate which monitored function failed leading to the alarm or shutdown whereas magnetic switches do not. Magnetic switches operate basically as a latching relay. Tattletale® annunciators and Magnetic Switches are available for use with engines or electric motors. Various circuits, time delays, and contact configurations are available to match the power source and mode of operation required for alarm only, alarm before shutdown or shutdown only.
Murphy's Tattletale® annunciators and Magnetic Switches are electrically tripped relay type devices. Models are available to operate from battery power, 120 VAC, conventional magnetos and capacitor discharge type ignitions. Energized to run models allow closed loop circuitry. Others draw momentary power to trip. Configurations are available for contact make or contact break to cause shutdown. Some models have both make and break contacts.
All models have a weather resistant case with screw terminals for ease of customer hookup. Manually reset models have a face mounted reset push button which also serves as a fault indicator in the Tattletale® version. Electrically reset models perform the same functions as the manually reset models and are reset by cycling the power supply off and then on. Time delay models use reliable solid state timing circuits to lockout operated switch contacts for start-up and/or to allow operation of alarms before shutdown occurs. Specific models allow application of power to a shutdown circuit and automatic disconnect of power after a given time delay.
Murphy's ST-Series Selectronic Tattletale® annunciators are used wherever a remote alarm and annunciation is required. When a fault occurs, the contact operation causes the appropriate LED to flash and the audible Mini-Siren to pulse. At the same time an output signal is generated which allows an external relay to be wired to operate a general alarm such as a bell or horn. Depressing the "alarm silent" button silences the local audible alarm and disconnects the output for the remote alarm. The flashing LED remains in operation until the fault is corrected and the contacts reset.