Hi,
In one of our projects, they client is requesting us to design a system where, 4-20mA is coming from PLC (Analog output module), into another panel. The panel has selector switch to switch between PLC or LOCAL control. When switch to "PLC", the 4-20mA signal will pass thru a relay contact and send to the VFD.
My concern is when the 4-20mA (or 0-10V) pass thru a relay, will there be any problem? Signal drops, instability, etc...?
Thanks, guys.
In one of our projects, they client is requesting us to design a system where, 4-20mA is coming from PLC (Analog output module), into another panel. The panel has selector switch to switch between PLC or LOCAL control. When switch to "PLC", the 4-20mA signal will pass thru a relay contact and send to the VFD.
My concern is when the 4-20mA (or 0-10V) pass thru a relay, will there be any problem? Signal drops, instability, etc...?
Thanks, guys.