adccommunitymod (AutomationDirect) asked a question.
Click PLC, New to programming
Created Date: February 24,2015
Created By: elstrick22
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I'm learning how to program and troubleshoot plcs. i'm learning through automation directs videos online. i have completed the first project in the click series videos. its just a standard program with a on time delay with an input and output. my program works fine and everything seems to be working properly. i have a web 24 v dc coil starter that i want to start when the out put is on. my question is that i have no 24 v dc to start the starter. any help would be appreciated.
Created Date: February 24,2015
Created by: Adisharr
You can pick up a 24VDC power supply fairly cheap. I would recommend it since just about every low voltage device in industry runs off of 24VDC.
Created Date: February 24,2015
Created by: Bob S BN
my question is that i have no 24 v dc to start the starter.
aren't all the Clicks powered by 24vdc??
Created Date: February 24,2015
Created by: elstrick22
Yes i have the C0-01AC 1.3AMP AC SYSTEM POWER SUPPLY NO POWER BUDGET installed along with the C0-00DD1-D MICRO PLC, 8 DC IN / 6 SINK DC OUT, NO BATTERY BACK-UP, REQ 24VDC POWER.
When I run my program, i flip the switch for the input to come in, the plc recognizes the input which i have programmed for input X001. the program have a on time delay, after five seconds the output is produced. I wont the out to produce 24vdc to seal in the coil of a starter. I have checked voltage on the output and have no voltage.
Thanks for the responses so far.
Created Date: February 24,2015
Created by: kewakl
What do you have connected to C3 and C4?
Created Date: February 24,2015
Created by: elstrick22
I had them wired in as a common. I had the 24 volt on the plus terminal on the bottom of the cpu.
Created Date: February 24,2015
Created by: bcarlton
Since kewakl hasn't posted again I'll ask it - how do you have you load wired to power and the output? Note: check the user's manual carefully. Post a drawing if you think it will be clearer.
As this is a 'sinking ' output it won't 'produce ' 24 volts. It will connect the common to the low side of a load which is wired to 24 volts on its opposite side.
Created Date: February 24,2015
Created by: elstrick22
Thank you, That helps alot. i think i know the root of my problem thanks alot.
Created Date: February 25,2015
Created by: Tinker
Depending on the size of your starter coil current might be an issue with the 0.1A rated transistor outputs, with smaller contactors the current might be ok, but reverse EMF protection will be essential with transistor outputs.
Created Date: February 25,2015
Created by: kewakl
@bernie, thanks for that follow-up.
@elstrick22, all is not lost, you can use a relay to connect the starter.
With this sinking output, tie the relay (+) terminal to +24v and control it with the sinking output to the relay (-) screw. Then switch a +24V signal - through the relay - to the starter as intended.
Following Tinker's statement, this would help protect the CPUs output.
Connect a diode across the relay coil (reversed) to shunt the collapsing magnetic field's induced voltage from going back into the CPU output. Put it at the coil, not at the output.
For this project any 1N400x should work. - Also, for this project, a reverse-connected diode across the starter coil would help protect the relay contact.
Since this is a learning project, consider this a learning experience.;)
In case you haven't located it, the spec sheet has a hookup wiring diagram.
- For reference, what is the 'starter ' that you are using?
Created Date: February 25,2015
Created by: elstrick22
CWC07-10-30L03 CONTACTOR 7A 3 N.O. PWR POLES 24VDC COIL N.O. AUX MINI SERIES
This is the starter i was using.