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Automatic Machinery Shutdown Using an External Electromechanical Relay While Monitoring 2 Axes
Figures 19 and 20
– Automatic Machinery Shutdown Using an External Electromechanical Relay While
Monitoring 2 Axes
The Smart Switches are hooked up in parallel for automatic motor shutdown when the alarm threshold level is
exceeded on either switch. The switches should be mounted in the horizontal and vertical direction at the bearing
carrying the most load. Pushing the Start pushbutton closes the M contact and starts the motor. If the start-up
delay option for the switches is enabled, the Smart Switches will not trip during the specified startup delay time,
regardless of the vibration level. After this delay, the switch relay will be activated if the vibration level of either
switch exceeds the alarm threshold for a period greater than the specified operational delay time. This action will
close the contact and send a voltage to the RL relay coil. This will open the RL contacts and shut down the
motor.
Since the LA (latching) option is specified, the RL coil will be constantly energized after this event; even if the
vibration level drops below the alarm threshold value after shutdown. The Reset pushbutton should be pushed to
reset the switch and close the RL contacts before restarting the motor.
