staleyt
Member
This is my first time dealing with PLC hardware, so forgive me for a possibly simple problem.
I'm trying to take a 0-50mV signal from a welder and feed it into an Allen Bradley 1756-IF16 analog input. The input module is configured to for differential inputs. The 0-50mV signal represents 0-1250A coming from a welder, and I have taken the wires directly off of the input and output of the analog display on the welder.
I have successfully wired one welder up so I can read the current on the computer, but when two welders are wired into the same module, I run into problems. Both welders must be on in order for the displays to show a nonzero value, and when they are both on, the values I am reading seem like they are low.
The low voltage on the current meter is the voltage being outputted by the welder, which can vary from 0-70V. Could this be a problem, even though the signal is only being compared to something 0-50mV higher than it?
Thanks to anyone who may be able to help!
I'm trying to take a 0-50mV signal from a welder and feed it into an Allen Bradley 1756-IF16 analog input. The input module is configured to for differential inputs. The 0-50mV signal represents 0-1250A coming from a welder, and I have taken the wires directly off of the input and output of the analog display on the welder.
I have successfully wired one welder up so I can read the current on the computer, but when two welders are wired into the same module, I run into problems. Both welders must be on in order for the displays to show a nonzero value, and when they are both on, the values I am reading seem like they are low.
The low voltage on the current meter is the voltage being outputted by the welder, which can vary from 0-70V. Could this be a problem, even though the signal is only being compared to something 0-50mV higher than it?
Thanks to anyone who may be able to help!