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4 Wiring with
4.10 Timing Relay
128
Operating instructions
05/10 MN05013003Z-EN
www.eaton.com
4.10.5.2 Timing relay, off delayed with and without random switching
Time value I1: Off-delay time
Random switching: The contact of the timing relay switches randomly within
the setpoint value range.
Figure 65:
Signal diagram of timing relay, off-delayed
(with and without random switching)
1: trigger coil TTx
2: Stop coil HTx
3: Reset coil RTx
4: Switch contact (N/O) Tx
ts
: setpoint time
• Range A: The time elapses after the trigger coil is deactivated.
• Range B: The Stop coil stops the time from elapsing.
• Range C: The Reset coil resets the relay and the contact. After the Reset coil drops out, the relay
continues to work normally.
• Range D: The Reset coil resets the relay and the contact when the function block is timing out.
Retriggering during the off-delay
If the trigger coil is activated again while the off-delay time is running down,
the timing relay stops the off-delay time and resets the actual value t to 0.
After the trigger coil is reset, the entire off-delay time set is run down.
Figure 66:
Signal diagram of timing relay, off-delayed
(with/without random switching with retriggering)
Range E: The trigger coil drops out twice. The actual time
t1
is cleared and the set time
ts
elapses
completely (retriggerable switch function).
A
B
t
1
+
t
2
=
t
s
t
s
C
1
2
4
3
t
s
D
t
1
2
4
3
t
s
E
t
1
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