Underspeed Sensing Assembly, Page
5
of
7
Section
9
– Revision 1
II. MOMENTARY START CIRCUIT OPERATION
The speed switch relay contact (SSR) closes and the time period starts when the start
push button is pressed, applying 115 volt control power to the relay (SSR). When an
input pulse from the proximity sensor is received the relay continues operating for a
full new time period starting at the next impulse. When the set time period expires
before the next input pulse is received, the relay opens contact (SSR) and stops the
motor.
This operation requires the speed switch relay to be set for a time delay setting of 6
seconds. This allows for motor start up and provides a time delay for the motor to
recover from a potential stall condition. See figure below for required DIP switch set-
tings.
DIP switches for selecting function
and time are placed behind a small
removable plate on the front of the relay.
With the DIP switches set to provide a time range of 0.6 to 12 seconds, set the % time
adjustment to 50 percent for a time delay of 6 seconds.