User manual

Timing relays
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Timing relay, off-delayed with and without random
switching
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 (make contact) Tx
t
s
: 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.
A
B
t
1
+ t
2
= t
s
t
s
C
1
2
4
3
t
s
D
t
EZ500_700.book Page 157 Tuesday, May 3, 2005 5:15 PM