Russ
Lifetime Supporting Member
I have a Robicon 454GT series drive, and am noticing some weird behavior. It was configured to use analog input 1 (4-20ma corresponding to 0-100%). LOS was set to shut off the drive.
What I'm finding is that the analog input signal is currently at 9.88mA with the wires disconnected. I set up a 4-20mA generator, and as I increased the signal the drive would get closer. 20mA matched perfectly, and the 16mA was read as 80%. Which made me think it was initially scaled 0-20mA.
But when I disconnected the wires the drive still saw an input.
I switched control over to analog input two, and while the signal is better than an1, it's still 9.24mA. There are no wires landed at tb18-19 (an1) yet it still reads 9.88mA.
I'd like to trim it, if at all possible, but I suspect there's something more going on.
Any help would be greatly appreciated.
What I'm finding is that the analog input signal is currently at 9.88mA with the wires disconnected. I set up a 4-20mA generator, and as I increased the signal the drive would get closer. 20mA matched perfectly, and the 16mA was read as 80%. Which made me think it was initially scaled 0-20mA.
But when I disconnected the wires the drive still saw an input.
I switched control over to analog input two, and while the signal is better than an1, it's still 9.24mA. There are no wires landed at tb18-19 (an1) yet it still reads 9.88mA.
I'd like to trim it, if at all possible, but I suspect there's something more going on.
Any help would be greatly appreciated.