Author Topic: Help a Technical Dummy Understand His Temp Controller  (Read 600 times)

Offline johnnyb

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Help a Technical Dummy Understand His Temp Controller
« on: June 29, 2015, 10:11:41 PM »
I would be extremely grateful if anyone can help me with this... I'm putting the finishing touches on my new chest freezer kegerator build and am confused by my temperature controller. I want to get the settings correct so I don't kill the compressor.

It's a Love TSX-10140. It has a ton of settings and I'm not clear on all of them even after reading the tech sheet that came with it and doing some online searching.

Here we go with the first group of settings that are giving me trouble...

SP = Set Point
r0 = Differential or hysteresis
r1 = Lower value for SP
R2 = Upper value for SP


So SP is self explanatory. I think r0 is the how many degrees above and below set point to kick the compressor on or off? But if that's the case, what are r1 and r2 for?


Next group of settings that are giving me trouble...

c0 = Minimum stopping time of load
c2 = ON time of fault cycle, when ambient probe is broken
c3 = OFF time of fault cycle, when ambient probe is broken
c4 = Minimum time since compressor start-up until the next stop
c5 = Minimum time since the compressor start-up until the next start-up

Anyone have a clue where I should start with these in order to prolong compressor life? Anyone know if these settings take precedence over the settings in the first group? (i.e. - if c4 = 10 minutes but the temp reaches my lower set point differential in 5 minutes, what happens?)


Offline johnnyb

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Re: Help a Technical Dummy Understand His Temp Controller
« Reply #1 on: July 03, 2015, 04:42:19 PM »
Nobody has experience with this controller?

I've been playing around with it for a few days and with my current settings the compressor kicks on about every 45 to 50 minutes and runs for about 2 or 3 minutes. Does that seem reasonable for compressor life? I only have 1 keg in there at the moment, it may run less when it's full.



These are the setting I'm using at the moment, and they are keeping a glass of water about 40 0F. I should probably adjust the settings to get a little warmer.

SP = Set Point = 42
r0 = Differential or hysteresis = 2
r1 = Lower value for SP = 40
R2 = Upper value for SP = 44
c0 = Minimum stopping time of load = 10
c2 = ON time of fault cycle, when ambient probe is broken = 5
c3 = OFF time of fault cycle, when ambient probe is broken = 5
c4 = Minimum time since compressor start-up until the next stop = 0
c5 = Minimum time since the compressor start-up until the next start-up = 10


I still have no idea what c2 and c3 are supposed to be doing.

Offline a10t2

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Re: Help a Technical Dummy Understand His Temp Controller
« Reply #2 on: July 03, 2015, 05:05:53 PM »
No experience, but the way it's worded seems straightforward.

r1 and r2 are a dummy-check to keep your set point reasonable. As long as r1 < sp < r2, you're good. If you need to move sp outside that range you'll need to adjust.

c2 and c3 are the on/off times for the failure mode where the probe is disconnected or broken. 5 min on, 5 min off isn't going to be great for a compressor, and since you're running a freezer would probably result in it freezing. I'd change c3 to 45 min, since that's what seems to be working for you.

c4 is the minimum time the compressor will stay on. I don't see any reason to increase it.

c5 is the minimum time between compressor cycles. As above, 10 min is pretty short but it seems unlikely you'll ever cycle it that much.
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Offline johnnyb

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Re: Help a Technical Dummy Understand His Temp Controller
« Reply #3 on: July 04, 2015, 12:42:37 AM »
No experience, but the way it's worded seems straightforward.

r1 and r2 are a dummy-check to keep your set point reasonable. As long as r1 < sp < r2, you're good. If you need to move sp outside that range you'll need to adjust.

c2 and c3 are the on/off times for the failure mode where the probe is disconnected or broken. 5 min on, 5 min off isn't going to be great for a compressor, and since you're running a freezer would probably result in it freezing. I'd change c3 to 45 min, since that's what seems to be working for you.

c4 is the minimum time the compressor will stay on. I don't see any reason to increase it.

c5 is the minimum time between compressor cycles. As above, 10 min is pretty short but it seems unlikely you'll ever cycle it that much.

Thanks.

r1 and r2 make sense but then I can't figure out the reason for r0.

I would never have guessed that c2 and c3 meant broken in the literal sense! I will make the suggested change as it makes total sense now.

I'll bump out c5 to 30 minutes.

Offline a10t2

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Re: Help a Technical Dummy Understand His Temp Controller
« Reply #4 on: July 04, 2015, 01:04:55 AM »
r1 and r2 make sense but then I can't figure out the reason for r0.

r1 and r2 don't set the maximum/minimum allowed temperature, they set the max/min *setpoint*.

If you had sp=40, r0=5, r1=38, and r2=42, the temperature would rise to 45, then the controller would kick on.
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Offline Stevie

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Re: Help a Technical Dummy Understand His Temp Controller
« Reply #5 on: July 04, 2015, 01:23:57 AM »

r1 and r2 make sense but then I can't figure out the reason for r0.

r1 and r2 don't set the maximum/minimum allowed temperature, they set the max/min *setpoint*.

If you had sp=40, r0=5, r1=38, and r2=42, the temperature would rise to 45, then the controller would kick on.
This makes since in a way. I guess it could be used to eliminate overshooting your temperature.

Offline johnnyb

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Re: Help a Technical Dummy Understand His Temp Controller
« Reply #6 on: July 04, 2015, 01:24:46 AM »
r1 and r2 make sense but then I can't figure out the reason for r0.

r1 and r2 don't set the maximum/minimum allowed temperature, they set the max/min *setpoint*.

If you had sp=40, r0=5, r1=38, and r2=42, the temperature would rise to 45, then the controller would kick on.

Agghhhhh I have it now.

SP can always be set without a code, while all the other parameters can be protected by code. r1 and r2 make sure that someone can't come along and screw things up too much without having access to the code!

Thank you sir!
« Last Edit: July 04, 2015, 01:26:56 AM by johnnyb »

Offline a10t2

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Re: Help a Technical Dummy Understand His Temp Controller
« Reply #7 on: July 04, 2015, 01:39:16 AM »
Exactly. Your assistant can never set a fermenter to freeze the beer, for example.
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