adccommunitymod (AutomationDirect) asked a question.
Created Date: October 13,2017
Created By: JeffreyH
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My system components: Click Ethernet Basic PLC C0-10DRE-D 1 ea. Click power supply C0-00AC for PLC power 1 ea. Click power supply C0-00AC for field power input devices are manual switches and PNP sourcing position sensors. While reading the Click Manual I found this statement on page 3-15: "A good common ground reference (Earth ground) is essential for proper operation of the CLICK PLC. One side of all control and power circuits and the ground lead on flexible shielded cable must be properly connected to Earth ground. " 1. In all the examples I have seen of Click system wiring the power supplies seem to be floating (not connected to ground). Even the PLC power supply is shown connected directly to the PLC with neither side connected to ground even though a ground terminal is provided. This seems contrary to the manual. Is this observation correct or am I missing something? What should I be doing? 2. Should I be tying down one side of my field power supply? What are the pros and cons?
Created Date: October 13,2017
Created by: JeffreyH
My system components:
Click Ethernet Basic PLC C0-10DRE-D
1 ea. Click power supply C0-00AC for PLC power
1 ea. Click power supply C0-00AC for field power
input devices are manual switches and PNP sourcing position sensors.
While reading the Click Manual I found this statement on page 3-15:
"A good common ground reference (Earth ground) is essential for proper operation of the
CLICK PLC. One side of all control and power circuits and the ground lead on flexible
shielded cable must be properly connected to Earth ground. "
1. In all the examples I have seen of Click system wiring the power supplies seem to be floating (not connected to ground). Even the PLC power supply is shown connected directly to the PLC with neither side connected to ground even though a ground terminal is provided. This seems contrary to the manual. Is this observation correct or am I missing something? What should I be doing?
2. Should I be tying down one side of my field power supply? What are the pros and cons?
Created Date: October 14,2017
Created by: kewakl
On another forum here here
Created Date: October 15,2017
Created by: JeffreyH
Wow, that is a heated debate. So much so it doesn't help me solve my dilemma. I'm of the mind to ground the 0V side of the Click power supplies but I don't want to blow things up. Has anyone else done this? Every 24vdc supply I have ever used has the outputs marked 24V + and - and you tie the appropriate + or - to ground. But the Click is marked +24v and 0v. Ive never seen this before and it makes me suspicious.
Created Date: October 15,2017
Created by: daakers
We don't normally use the C0-00AC power sully with the Click PLC. But we ground the neg side of every power sully we install. So far no problems. We have install over 25 Clicks this year along.
Created Date: October 15,2017
Created by: daakers
Sorry for the type O, that should have been "power supply with the Click "
Created Date: October 15,2017
Created by: JeffreyH
DAAKERS,
So, on the Click PLC itself there are also 3 power connections provided, 24v, 0v and grnd. Are you also tying the 0v to the grnd terminal on the PLC?
Created Date: October 15,2017
Created by: kewakl
Wow, that is a heated debate. So much so it doesn't help me solve my dilemma.
Why I did not immediately weigh in......
Some of the participants have great rationale for their choice. Water, pools, thermocouples, isolation provided by switchmode supplies .....
I'm of the mind to ground the 0V side of the Click power supplies but I don't want to blow things up. Has anyone else done this?
I do.
Every 24vdc supply I have ever used has the outputs marked 24V + and - and you tie the appropriate + or - to ground. But the Click is marked +24v and 0v. Ive never seen this before and it makes me suspicious.
0V is - / -v on this supply.
Created Date: October 16,2017
Created by: JeffreyH
kewakl,
Thank you for that.
At the power supply do you jumper the gnd contact directly to the 0v contact? Do you still run all 3 connections to the PLC? Sorry to be so confused. I have programmed PLC systems in the past but never built one.
Created Date: October 16,2017
Created by: kewakl
I usually do the connection at a dedicated terminal block on a DIN rail. -- just so it looks intentional .
Yes, I do run three wires to he CPU.
Created Date: October 16,2017
Created by: daakers
DAAKERS,
So, on the Click PLC itself there are also 3 power connections provided, 24v, 0v and grnd. Are you also tying the 0v to the grnd terminal on the PLC?
I do the same as Kewakl, we ground the power supply (-) to our grounding TBs and run 3 wires to the Click.