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Timing relay, on-delayed with and without random switching
Random switching:
The contact of the timing relay switches randomly within the setpoint value
range.
1
2
3
4
t
t
s
A
B
Figure 188:Signal diagram of timing relay, on-delayed (with and without random switching)
1: Trigger coil T...EN
2: Stop coil T...ST
3: Reset coil T...RE
4: Switching contact (N/O contact) T...Q1
t
: setpoint time
s
• Range A: The time runs down from the set time value.
• Range B: The time does not elapse because the trigger coil drops out prematurely.
• Range C: The Stop coil stops the time from elapsing.
1
2
3
4
t
t
s
s
D
E
Figure 189:Signal diagram of timing relay, on-delayed (with and without random switching)
• Range D: The stop coil is inoperative after the time has elapsed.
• Range E: The reset coil resets the relay and the contact.
• Range F: After the reset coil is activated, the switching contact is switched off and the internal time
counter is reset. The function relay waits for a new trigger pulse.
Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
+ t
= t
t
1
2
s
C
t
F
F
5 Function blocks
5.32 T, timing relay
259
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