Automatic Machinery Shutdown Using An External Electromechanical Relay - PCB Piezotronics IMI SENSORS 686 Series Installation And Operating Manual

Automatic Machinery Shutdown Using an External Electromechanical Relay

Figures 17 and 18 – Automatic Machinery Shutdown Using an External Electromechanical Relay
The Smart Switch is hooked up for automatic motor shutdown when the alarm threshold level is exceeded. The
switch should be mounted in the horizontal direction on 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 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 RL1 and close the RL2 contacts, shut down the motor, and light the pilot lamp.
Since the LA (latching) option is enabled, 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 RL1 and RL2 contacts before restarting the motor.
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