Hello,
I'm sure having trouble getting a curs100 hooked up correctly on a cr1000, campbell just tells me to read the manual, the programing think I understand - it's the basic wiring I'm really having trouble with.
It's a 4-20ma output in on a motor actuator, here is a link to the schematic for the actuator. I'm using connections #23 and #24 E2 Position feedback.
http://tumalo.org/motor.jpg
I'm trying to hook it up to a cr1000 and curs100 - so far every time I try it just throws all the other sensors out of kilter. Connections #23 and #24 measure 24.7VDC if that matters.
If you can help I'd sure appreciate it.
Thank You,
Have you measured the resistance between 1H and 1L on the CURS100 to make sure the 100 ohm resistor is ok? (without it connected to the datalogger)
I'm assuming you have pin 23 connected to 1H on the CURS100 and pin 24 connected to 1L on the CURS100.
Are you sure you have the correct voltage range setting on your VoltDiff instruction in the CR1000?
* Last updated by: IslandMan on 8/27/2010 @ 4:28 AM *
Thank you, I was wired like in example figure 4-2 but since changing it, everything seems to be working. I may have to fiddle with my multi and offset yet.
this is a slide gate with a 0 to 4' (4-20ma) range, currently I'm reading 0.97 when the gate is closed and it seems to track 1' high on my reading. I'll have to wait until it goes offline before I can fool with it through it's full range and do some more testing.
This is the Voltdiff params I'm using are;
VoltDiff (GPOS,1,mV5000,4,True,0,250,.0025,-1)
Thank You again for your time.
Ken
Ken,
V = 100 X 0.004 A = 400 mV = 0 Inches
V = 100 X 0.02 A = 2000 mV = 4 Inches
Use the mV2500 range.
VoltDiff (GPOS,1,mV2500,4,True,0,250,.0025,-1)
The Multiplier and Offset are correct.
There might be something off with the gate output.
One other factor to watch out for is that you do not have a ground loop between the ground of the logger and that of the 4-20 mA output module.
You first email implied the module had a 24 V bias on it which implies it is designed to drive current to the sense resitor without needing power from the logger.
Your wiring should probably be more like fig 4-7 but where the power to the sensor is already internal to the actuator. If wiring like that you can have problems with ground loops if the logger ground is connected to the same signal ground as the actuator. It depends on the internal design of the current loop driver.