PCB Piezotronics IMI SENSORS 686 Series Installation And Operating Manual page 20

Using Three Switches in Parallel to Monitor Three Motors Simultaneously
The three Smart Switches
are hooked up in parallel
and installed on each motor
in the horizontal direction.
This provides an
economical solution for
monitoring a group of
machinery while only
having to run one cable.
Pushing any Start
pushbutton will close the
corresponding M contact
and start the motor. If the
start-up delay option for the
switches is enabled, then
during the specified startup
delay time, the switches will
not trip; regardless of the
vibration level. After this
delay, the pilot lamp will be
illuminated if any of the
switches experience a
vibration level over the
alarm threshold value
lasting greater than the
specified operational delay
time.
Since the NL (non-latching)
option is specified, the pilot
lamp will illuminate while
alarm threshold on any of
the switches is exceeded.
When the vibration level for
all switches drops below
their alarm threshold value
(based also on the
specified hysteresis), the
pilot lamp will turn off.
Figures 15 and 16 – Using Three Switches in Parallel to Monitor Three Motors Simultaneously
PAGE 15