User manual

Timing relays
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Function of the timing relay function block
Timing relay, on-delayed with and without random
switching
Random switching: The contact of the timing relay switches
randomly within the setpoint value range.
Figure 63: Signal diagram of timing relay, on-delayed
(with and without random switching)
1: trigger coil TTx
2: Stop coil HTx
3: Reset coil RTx
4: switch contact (make contact) Tx
t
s
: setpoint time
• Range A: The set time elapses normally.
• Range B: The entered setpoint does not elapse normally because
the trigger coil drops out prematurely.
• Range C: The Stop coil stops the time from elapsing.
t
1
+ t
2
= t
s
t
A
B
t
s
1
2
4
3
C
EZ500_700.book Page 155 Tuesday, May 3, 2005 5:15 PM