phil hughes
Lifetime Supporting Member
- Join Date
- May 2005
- Posts
- 31
We are sending a setpoint to our Ozone generator using a 4-20mA signal from a SLC5/05 NO8I Output card .
The Wedeco Ozone generator receiving the setpoint has a Automation Direct PLC DL250-1 PLC -analog Input card is a F2-O4AD-1.
The system has been in use for 10 years . We have just started experiencing an unstable setpoint at our generator, the SP floats high and low then returns back to normal on random occasions . I used a Fluke 772 mA clamp meter to determine if the signal coming from our SLC is stable -it appears to be rock solid.the 24v power supply is perfect. Both ends of the belden are grounded.
No recent wiring modifications have taken place.
My question is ; I dont know whats going on ? is it noise the my clamp on meter can not detect interfering with the Automation direct PLC input .
Any help would be appreciated
The Wedeco Ozone generator receiving the setpoint has a Automation Direct PLC DL250-1 PLC -analog Input card is a F2-O4AD-1.
The system has been in use for 10 years . We have just started experiencing an unstable setpoint at our generator, the SP floats high and low then returns back to normal on random occasions . I used a Fluke 772 mA clamp meter to determine if the signal coming from our SLC is stable -it appears to be rock solid.the 24v power supply is perfect. Both ends of the belden are grounded.
No recent wiring modifications have taken place.
My question is ; I dont know whats going on ? is it noise the my clamp on meter can not detect interfering with the Automation direct PLC input .
Any help would be appreciated