User manual

Timing relays
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Timing relay, on-delayed and off-delayed with and
without random switching
Time value I1: On-delayed time
Time value I2: Off-delayed time
Random switching: The contact of the timing relay switches
randomly within the setpoint value ranges.
Figure 67: Signal diagram of timing relay, on- and off-delayed 1
1: trigger coil TTx
2: Stop coil HTx
3: Reset coil RTx
4: switch contact (make contact) Tx
t
s1
: pick-up time
t
s2
: drop-out time
• 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.
A
B
C
1
2
4
3
D
tt
s1
t
s2
t
s2
t
s1
t
s2
t
1
+ t
2
= t
s1
EZ500_700.book Page 159 Tuesday, May 3, 2005 5:15 PM