View Full Version : Carrier 3200MP code question.
05-18-2005, 10:57 PM
I am in the process of retrofitting a new control system into an old chiller plant.The chiller I was working on today is a 19DM, it was on a drive and had a carrier LLid attatched to it.I turned the drive into a soft start and put all the wiring back to the stock 3200MP diagram.The problem I am having is, when the chiller comes upto speed and runs , it trips on code 82, loss of motor current signal.The current signal is still the factory CT and resistor but it used to go into the carrier LLID and then that LLID sent a signal to 23-24 on the 3200MP.I only have .080 volts when compressor is upto speed.I put a 10K ohm resistor in series and it kept the compressor online but this is a bandaid and I can't calibrate the FLA.Is there a toggle point in the 3200MP that can be set to accept a different signal for motor current across 23-24, I worked on this for a few hours today and am still scratching my head, I just can't see why my voltage signal is getting dragged down by the controller, should be .5VAC at FLA and is not even close.
05-18-2005, 11:09 PM
There is an adjustment for % Motor Current on the 32 MP, did you try that?
05-18-2005, 11:11 PM
The adjustment I was playing with was the FLA pot, that is the only one I found,same as the old 32sm panel.
05-18-2005, 11:17 PM
Do you mean the Demand Limit knob?
05-18-2005, 11:19 PM
No, the current calibrator pot inside the control panel.
05-18-2005, 11:21 PM
Yep, that's the one I was meaning.
Did you check or adjust the resistor in the starter?
05-18-2005, 11:26 PM
Yeah, it is outputting the right voltage but for some reason the 3200MP is not reading it right, it is dragging the voltage down to a point to where it loses the signal completely.I need to know if there is an adjustment on the board or in software that changes this to a 0-.5VDC or to a 4-20 etc.
05-18-2005, 11:33 PM
Anything along the way between starter an 23-24?
Is there a ground somewhere?
No, to your questions.
A BAS can have an input to control demand limit.
[Edited by r718 on 05-18-2005 at 11:37 PM]
05-28-2005, 09:19 AM
What did ya find?
05-28-2005, 11:43 AM
I repulled the wire in the starters and also to the controller and the problem went away.It was very strange the way Carrier had this wired.They had 2 chillers and 2 stand alone controllers but the current signal wires between the 2 chillers were parallelled.There is no way both machines could have run at the same time.
05-28-2005, 04:36 PM
Thanks for the update.
Certainly something odd with original wiring.
Powered by vBulletin® Version 4.2.0 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.