Some questions about the use of the relay

Question

I connect Relay coil  to the AC power source,but  the switch always act.Is there any suitable relay for ac power ?
and when I replaced time delay relay in simulation, there was an error.  I don't know how to get the right parameter setting ?
please help.
Attachments:
time_delay relay.png ‏5 KB

Answer 1

Hi there,
Thank you for your question. There are two ways to do this, for your origianl circuit you can connect the time delay relay in this way:
Set the frequency of the source to 1Hz and simulate, then you can see the NC and NO switch back and forth.
Second method: Instead of using a AC relay, we can use an AC coil which can be found at Electro_Mechanical-->COILS_RELAYS-->ENERGIZING_COIL_AC
In addition, we can add a normally closed (NC) contact or a normally open(NO) contact spicified for this AC coil(say K1)
Just type RELAY_CONTACT_NC or RELAY_CONTACT_NO to place the components and then place them under K1.
Change the Controlling device reference as shown in the picture below,
Now the AC relay can be constructed in this way.
For time delay, we can use TIME_DELAY_NC and TIME_DELAY_NO contact
Hope these two methods help!:-)
Best,
Chen_T
National Instruments