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Internal Sequential Operation
The following shows the signal flow of the internal sequential operation of
figure 1.1.
1) When the sensor turns on, the coil of the input relay X6 is magnetized.
2) Magnetizing the coil of the input relay X6 conducts the normally open
contact X6 and magnetizes the coil of the output relay Y74.
(As the timer is not magnetized at this time, the normally closed
contact remains conducted.)
3) Once the coil of the output relay Y74 is magnetized, the external
output contact Y74 is conducted and the magnetic contactor (MC) is
turned on.
4) Turning off the sensor demagnetizes the coil of the input relay X6 and
the normally open contact X6 becomes non-conductive.
As the self-maintaining normally open contact Y74 is conducted, the
coil remains magnetized. (Self-maintaining operation)
5) When the coil of the output relay Y74 is magnetized (with the normally
open contact Y74 conducted), turning off the sensor (with normally
closed contact X6 conducted) magnetizes the coil of the timer T1 and
the timer starts measuring the time.
After three sec. (K30 indicates 3.0sec.), the normally open contact of
the timer becomes conducted and the normally closed contact
becomes non-conductive.
6) As a result, the coil of the output relay Y74 demagnetizes and the load
magnet contactor drops.
Also, the output relay self-maintenance is released.
Operation diagram
The following time chart explains the input/output relays and timer
operations.
(Coil)
(Contact)
3 sec.
Input X6
Output Y74
Timer T1
Timer T1