Created Date: October 31,2008

Created by: KPrice

psribich, your configuration should work. We did a similar project, not the Modutrol, but one similar. The F2-02DAS-1 sourcing output should work. The damper motor should have an input impedance well within the 0-1375 ohm capability of the F2-02DAS-1.

Is this a new installation, or is this a unit that was working, but now is not?

Using DirectSOFT, can you monitor your raw output to the F2 module? And measure the ma current to, and the voltage at the damper motor 4-20ma terminals? This will tell us if your module is putting out ma proportional to your raw value, and that your wiring is good to the damper motor. And it will let us calculate the impedance of the damper 4-20ma input. Also, verify the correct drive voltage to the damper motor power terminals.

Also, is there any other control wiring that must be in place to allow modulation of the valve? For example, do you have control signals that are causing a lo-fire or hi-fire over-ride to the modulating command signal?

Does the damper move full stroke (easily, no binding) when you do cause lo-fire and hi-fire over-rides?

Created Date: November 02,2008

Created by: psribich

KPrice, This project started out with an exsisting installation. The old setup worked fine, but I have completely replaced the old Seimens PLC with a AD 205 9 slot PLC . I ran new wires direct between AD plc and motor. Anytime both wires are connected, no matter what the signal, the motor goes to full open. If one wire is disconnected, the motor goes to full closed. So I started to think that the motor was bad, bought a new one, took it out of the box and connected, same thing. I saw another post about a similar problem which got me thinking about the sinking sourcing issue but could not find anything in the motors documents stating one or the other.

I believe the impedance of the motor is 135 ohm, which as you state should be fine.

There are no other overrides in the setup, since I have direct wired all together on my test bench. I have been able to measure the voltage, and it changes from .398 V to 1.98 v between 4 mA and 20mA signal. I have watched the value change on the Directsoft program, and that seems to be working fine. I have never been able to measure mA directly. I am not a electical engineer, so I am not 100 certain on how to, but from what others have told me, I am connecting the meter right, it just may be my cheap meter.

ADC App Assist, if this motor requires a sinking setup, would that cause the motor to go full open, when the sourcing card is connected even if the signal is 4mA?

Thanks for the help!

Paul

Created Date: November 03,2008

Created by: KPrice

psribich, it appears that you are outputting 4-20ma from the PLC module, but from your test measurements of voltage at 4ma and 20ma, it looks like the impedance should be about 100 ohm?

OK, so it doesn't sound like another signal (or lack of signal) is enabling or disabling the modulation.

As far as checking amps, many test meters allow you to measure DC amps up to a small amount, perhaps up to 200 ma. Perhaps your meter only measures to 20 ma. Either way, since we 're only measuring up to 20 ma, your meter should have that capability. The test meter dial might read DCA, and the setting might read 200m. But check your meter instructions. The meter then must be connected in series with your output wire. This would be a helpful test.

The PLC raw data is at 0 when you read .398VDC and at 65535 when you are at 1.98VDC?

I don't know the connections on this model to verify the correct connections. Although our motor used the sourcing output module, like you have, I don't know the spec on your motor. I'll see if I can find some info on this and reply back.

Created Date: November 03,2008

Created by: psribich

KPrice,

You are correct the ohm value is 100 not 135 like I thought. I just went through the paper work. No ware in the paper work does it state anything about sinking/sourcing signal. It just shows that the + signal be connected to the + terminal and the -signal be connected to the - terminal.

here is the link to the manual:

http://customer.honeywell.com/techlit/pdf/PackedLit/63-2640.pdf

Thanks.

Created Date: November 03,2008

Created by: KPrice

psribich, yes, the manual does not give many electrical details.

Is this how you have the wiring?

At PLC:

24+ from P/S to module +V1

24- from P/S to module 0V1

4-20ma cable from PLC to damper is shielded, twisted-pair

4-20ma cable shield drain connected to ground terminal

24- from P/S connected to ground terminal

AC ground connected to ground terminal

PLC base ground terminal connected to ground terminal

PLC base earth ground-to-signal ground jumper in place

At Damper:

+I1 from module to + on damper

-I1 from module to - on damper

120VAC hot to L1 on damper

120VAC neutral to L2 on damper

AC ground to ground on damper

4-20ma cable shield drain insulated

But what does not happen?

at 4ma (0.4V) (0 raw data), damper closes (

at 12ma (1.2V) (32767 raw data) damper mid position

at 20ma (2.0V) (65535 raw data) damper opens

And measuring voltage, the + lead is on the damper + terminal, and the - lead is on the damper - terminal.

And, except for the F terminal, you have no other terminals on the damper?

Were you able to also measure ma?

Could the damper + and - terminals be marked wrong? (grasping at straws)

Created Date: November 03,2008

Created by: psribich

KPrice,

All the wiring is as you mentioned. Nothing on the F terminal.

Still can't measure mA, I need to get a better meter. THe voltages, as measured on the motor terminals, are as stated befor between 0 and 65535.

I even talked with the Honeywell tech guy this morning to verify sinking/sourcing. He said there is nothing stated in the engineering data, that it should not matter.

I have a replacement motor coming, maybe this one is just bad. This is such a simple setup, it has been driving me crazy.

Thank you for all the help!

I will post a reply when I get the new motor with the results. I should have it today or tomorrow.