User manual

Publication 1760-UM001A-EN-P
4-22 Drawing a Circuit Diagram with Pico
Timing Relays, Off-Delayed With and Without Random Switching
The relay switches a contact immediately and then resets it after
the setpoint delay has elapsed. With random switching, the relay
contact switches randomly at any time up to the specified time
value (shown shaded in figure).
Figure 4.5 Timing Diagram
The trigger coil switches the contact. If the trigger coil (A) drops out, the setpoint
time starts and resets the contact after the time has elapsed. The reset coil has
priority over the trigger coil and always resets the relay contact (B, C). If the time is
set to zero, the contact follows immediately after the trigger signal.
Typical applications
• Activating the deceleration of motors or fans
• Automatic lighting control for vacant buildings with random switching times
?
tt
ABC
Output
Reset
Trigger
On
On
On