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Safety function blocks
502
02/16 MN05013001Z EN
Timing relay, off-delayed with retriggering
If the time is running and the trigger coil is operated again,
the actual value of the time already elapsed is set to zero.
The complete setpoint value elapses again; with the subse-
quent drop-out of the trigger coil, the complete allocated
time elapses again.
Figure 262:
Signal diagram of timing relay, off-delayed
(with/without retriggering)
a
The set time t
s
elapses after the trigger coil is deactivated.
b
The Stop coil stops the run down of the set time t
s
.
c
The Trigger coil drops out twice. The actual time t
1
is cleared
and the set time t
s
elapses completely (retriggerable switch
function).
d
The dropping out of the coil TS..SA causes the timing relay to
deactivate and the contact TS..QS opens.
t1
TS..SA
TS..TR
TS..QS
TS..ST
t1
ts
t1 + t2 = ts
t2
ts
t < ts
a
b
c
d
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