Search found 270 matches

by richiem
Mon Sep 21, 2015 4:17 pm
Forum: Temperature Controller
Topic: Temp jumps around with JLD-614
Replies: 1
Views: 1319

Re: Temp jumps around with JLD-614

The voltmeter used to monitor the voltage across the RTD may have an integration period that is long enough to hide variations in the probe resistance or in the current source in the 614. Hard to guess which device is at fault, and the only way to tell is by substitution. It is least costly to try a...
by richiem
Sat Sep 12, 2015 12:05 am
Forum: Temperature Controller
Topic: JLD612 How To set to act as thermostat for On/OFF control?
Replies: 3
Views: 1220

Re: JLD612 How To set to act as thermostat for On/OFF contro

Further notes -- Got a chance to look at the manual again -- you want to use Outy set to 3 (see figure 3 int he manual, the heating example); set AH1 to your SV (set value, where the heater turns off) and AL1 to your desired lower temp where you want the system to turn back on; I would suggest a dif...
by richiem
Fri Sep 11, 2015 4:02 pm
Forum: Temperature Controller
Topic: JLD612 How To set to act as thermostat for On/OFF control?
Replies: 3
Views: 1220

Re: JLD612 How To set to act as thermostat for On/OFF contro

This issue has been addressed here in the forum a number of times. The manual details exactly how to use the JLD 612 as a simple thermostat, which includes the ability to set the amount of hysteresis, ie how big a temp differential will occur before turn-on to reheat. Please read the manual for the ...
by richiem
Mon Jul 13, 2015 10:21 pm
Forum: Temperature Controller
Topic: JLD 634 HELP!
Replies: 5
Views: 2079

Re: JLD 634 HELP!

@AlpacaGreg -- so is it working correctly for you? It wasn't clear whether you got what you needed yourself or if there are still questions.... Dick Moore BTW, I won't be able to add anything for a couple of weeks as I'll be travelling (not that I'm familiar with the 634, but I have looked through t...
by richiem
Tue Jul 07, 2015 5:17 pm
Forum: Temperature Controller
Topic: temperature controller for cells incubator
Replies: 3
Views: 1254

Re: temperature controller for cells incubator

Yep -- that's about it. Everything on the power side is in series, and watch polarities very carefully (except the resistance heater -- it doesn't care). The controller has the DC output that drives the relay's control input, and again polarity is critical. Hope this helps.
by richiem
Wed Jul 01, 2015 11:24 am
Forum: Temperature Controller
Topic: temperature controller for cells incubator
Replies: 3
Views: 1254

Re: temperature controller for cells incubator

This isn't a complete answer -- you'll have to be handy with making stuff. I would use the TH100PT sensor -- you'll need to solder on an extra wire to one lead to use with the JLD612 as a Pt100 type sensor. Other things possibly needed -- a circulation pump to keep water/bath-liquid moving over the ...
by richiem
Fri Apr 17, 2015 8:39 pm
Forum: Temperature Controller
Topic: Constant SSR output from JLD-612
Replies: 2
Views: 1464

Re: Constant SSR output from JLD-612

Hi Ross -- the SSR output is a DC current source with a maximum voltage of 8V (compliance V) at zero current output. The SSR responds to the current flowing into it, not the voltage across its control terminals. The correct polarity of the connections is vital -- the 2011 manual version has a great ...
by richiem
Wed Apr 15, 2015 12:23 am
Forum: Temperature Controller
Topic: Analog output of JLD612 temperature
Replies: 1
Views: 1074

Re: Analog output of JLD612 temperature

I've opened one up and it wasn't obvious to me how that might be done. There is a version of the JLD that has RS-232 (or maybe RS-485?) inputs and outputs, and that would be an easier deal for logging anyway.
by richiem
Thu Mar 26, 2015 2:54 pm
Forum: Temperature Controller
Topic: JLD612 and pt100
Replies: 6
Views: 1916

Re: JLD612 and pt100

In a recent previous post, I explained how to check the Pt100 probe with ice water and boiling water using an ohmmeter (DMM) -- this lets you know whether it is the probe or the 612 that has the problem. Could be either, so knowing which is kind of important.
by richiem
Tue Mar 10, 2015 11:06 am
Forum: Temperature Controller
Topic: JLD612 and PT100 RTD
Replies: 5
Views: 1849

Re: JLD612 and PT100 RTD

Yep, that's a lot -- I suspect that either the Pt100 RTD probe is bad, or the JLD612 has a problem. Talk to Marco. If you have a digital ohmeter or a good quality DMM, stick the probe into a slurry of crushed ice and water, and measure the resistance between one red wire and the blue wire -- it shou...
by richiem
Sun Mar 08, 2015 10:32 pm
Forum: Temperature Controller
Topic: JLD612 and PT100 RTD
Replies: 5
Views: 1849

Re: JLD612 and PT100 RTD

How far off does it seem to be? Are we talking a degree or two, or tens?
by richiem
Wed Nov 05, 2014 3:14 pm
Forum: Temperature Controller
Topic: JLD612 AL2 Blinking
Replies: 5
Views: 2127

Re: JLD612 AL2 Blinking

To the best of my knowledge, the manual is entirely correct about alarm functions; for heating, its straightforward, for cooling, a bit counter-intuitive. Correct also for the Hy instructions. Follow the manual and all should be well. I call Outy=4 the thermostat mode -- it works exactly like you wo...
by richiem
Sun Nov 02, 2014 2:50 pm
Forum: Temperature Controller
Topic: JLD612 AL2 Blinking
Replies: 5
Views: 2127

Re: JLD612 AL2 Blinking

Use Outy setting 4, with relay J2 as the controller. See fig 3 on page 4 of the manual I have. I assume you know that you need an external power supply hooked through relay J2 to operate the valve...
by richiem
Sun Nov 02, 2014 2:44 pm
Forum: Temperature Controller
Topic: Autotune missing in menu of 612 controller
Replies: 1
Views: 1232

Re: Autotune missing in menu of 612 controller

I was waiting for Marco to reply... Your controller is fine. Download the manual posted in 2011 here a lightobject.com. It explains how to invoke auto-tuning -- there is a typo in the chart showing the progression of commands, but the text listing of commands is correct.
by richiem
Fri Sep 05, 2014 3:21 pm
Forum: Temperature Controller
Topic: SSD voltage and limit switch
Replies: 2
Views: 1787

Re: SSD voltage and limit switch

@neo -- RE question 2: The mechanical relays J1 and J2 are regular electro-mechanical relays actuated by various programmed functions in the controller -- there is no built-in power source connected to them, so any thing controlled by closing or opening one of the relays needs an appropriate power s...

Go to advanced search