ABB CL Series Applications Manual page 160

1SVC 440 795 M0100
Timing relay, on- and off-delayed with and without
random switching
Time value I1: on-delay time
Time value I2: off-delay time
Random switching: The contact of the timing relay switches
randomly within the setpoint value ranges.
1
2
3
4
t t t
s1 s2
A B
Figure 66: Signal diagram timing relay, on and off-delayed 1
1: Trigger coil TTx
2: Stop coil HTx
3: Reset coil RTx
4: Switching contact (n/o contact) Tx
t : Pick-up time
s1
t : Drop-out time
s2
• Range A: The relay processes the two times without any
interruption.
• Range B: The trigger coil drops out before the on-delay is
reached.
• Range C: The stop coil stops the timeout of the on-delay.
• Range D: The stop coil has no effect in this range.
Timing relays
+ t = t
t t t t
1 2 s1 s2 s1 s2
C D
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