Re: Sanden compressor clutch
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Home away from home
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Hmmmmmm. But the ground of the pump is attwmpting to feed 12 v back into the ground of battery one?????
Cheque the voltage betwwen ground and pos post of battery one.
Posted on: 2013/10/18 20:27
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Sanden compressor clutch
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Home away from home
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Not sure this will work but maybw worth a try:
Starting fresh: Dirrect connect neg post of bat 1 to pos post of bat 2 with a diode in the wire. Neg post of bat 2 direct to clutch. Isolate ground of clutch from rest of car. Ground clutch back to BOTH batteries with 2 seperate wires.
Posted on: 2013/10/18 20:39
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Sanden compressor clutch
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Home away from home
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NOTE.
Testing your current set up: Disconnect ground of bat one from frame of car. Place voltmeter between pos post of bay 1 and framme of car. BE SURE TO NOT USE THE ACTUAL CLUTCH FOR THIS TEST. SUBSTITUTE A 12v lite bulb for the.clutch. i say this because im not sure if the voltmeter will carry the amperage of the clutch thus damaging volt meter. Im guessing with the above test u will find 12v going back into bat 1 from the clutch ( bulb in test case).
Posted on: 2013/10/18 21:02
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Sanden compressor clutch
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Not following what you are saying with the ground of the pump feeding back into ground of bat 1. There is a normally open relay contact in the path unless the relay closes for clutch to be energized. Once relay energizes the batteries are in series. Works as drawn on the bench. Only difference between test bench and on car is I'm using a solid wire for ground instead of a frame.
I am using the reg clutch and the current draw when clutch is energized is about 2.75amp.
Posted on: 2013/10/18 21:05
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Howard
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Re: Sanden compressor clutch
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Home away from home
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Ok. But what is voltage reading at the ground post of bat one?!?
Posted on: 2013/10/18 21:08
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Sanden compressor clutch
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Home away from home
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12v must be coming OUT of the clutch. Only placce the 12v can go from there is back to bat 1 thru the ground strap of bat 1. No????
Posted on: 2013/10/18 21:13
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Sanden compressor clutch
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Forum Ambassador
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Quote:
12v must be coming OUT of the clutch. Only placce the 12v can go from there is back to bat 1 thru the ground strap of bat 1. No???? Correct but it's ground or in this application we'll call it 0 volts. 2 batteries in series will give 12v to the clutch coil feed wire but the return is the same potential as the battery 1 ground. As long as the AC clutch is the only thing to see 12v, no other component will be affected and is no different than any other power supply setup with multiple voltages and polarities sharing a common return or ground in this case. In this setup the only thing that sees a slightly different voltage is the + terminal of bat 2 when they are in parallel. Because of the resistor it is about 200-300mv less than bat 1 + terminal.
Posted on: 2013/10/18 21:24
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Howard
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Re: Sanden compressor clutch
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Home away from home
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Howard - Jim Hollingsworth showed me his '40 One-Sixty Club Sedan with AC. He was operating the Saden compressor's clutch with a 12-volt battery back in the trunk. He said it would provide power for weeks' worth of usage. Not convenient, but workable. I guess you could use an 8-volt batter, but it would probably be more expensive than a 12-volt. Maybe a small motorcycle battery could serve as a power source? I know all of this has been discussed many times before.
David Flack may have a phone number for the guy from Salado who has Jim's '41 AC Clipper. (o{}o) Edit: Not an engineer (far from it), but looks like a nice engineering solution, lots of thought and knowledge went into it. Thanks for sharing.
Posted on: 2013/10/19 11:18
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We move toward
And make happen What occupies our mind... (W. Scherer) |
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Re: Sanden compressor clutch and other things
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Forum Ambassador
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Thanks, John. I guess the fellow with the 41 Clipper doesn't like email or else doesn't like the fact I'm doing strange things to a Packard. I had asked about the clutch and also asked about how the return air was done in the Clipper. Maybe shouldn't have told him my reason for asking.
Another poster is making me a false trunk AC evaporator enclosure so it will at least look somewhat like Packard might have done. He says the AC units were essentially the same in conventional and Clipper bodies. Had to reconfigure my modern AC unit to fit the space. Rather than change anything on the car to make a factory bottom duct piece fit for return air, have made a thin sheet metal plenum to go behind the rear seat to fit needs of my modern unit. Will pull air from the package shelf area and from under seat. It spaces the seat back out 3/4 inch but is barely noticeable. It looks as if the seat bottom can stay in original spot but can move out if it later proves to need to. Am reasonably convinced this battery setup will work as drawn so until proven otherwise will go with it. Was going to mount things in trunk with AC unit. Now am planning to mount it in the real estate that became open when others confirmed nothing was there except a loom. Painted black, it will be relatively unobtrusive. More importantly, will be close to other wiring needed for relay signals. Being lazy at heart, have also decided to give the purists something else to be upset about. Didn't want to lift the hood to find a disconnect switch so made this one operational from inside the car similar to what I did on the 56. Also works from under the hood as well. Couldn't figure a good way or place to mount the switch directly to the firewall for rotary operation like the 56 was done so made it push pull instead. Ran the pull cable thru an existing grommet and made a bracket to fit between the emerg brake and hood release. With a different Packard styled and correct knob it will be relatively unobtrusive and out of the way. Here's a few photos of the planned battery location and the disconnect.
Posted on: 2013/10/19 12:52
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Howard
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