I'm having some problems with my REX-C100 as well. I'm not really sure if this is the right forum for this discussion, but a lot of people seem to be talking about it here... so here it goes...
For example I'll set the 'set value' to 66, it will heat the water up to that level and then the 'present value' display will read as if it is holding a steady temp at 66. Afterwards I'll raise the set value to 75, and instantly the present value temperature reading will increase dramatically. So while displaying that it was holding a temp at 66, it was actually increasing the temperature of the water and it doesn't show the actual temperature until the SV has been changed.
I have no idea what is going on here. Do any of you know what it could be?
Here are some pictures of my box:http://i43.tinypic.com/33uzsr6.jpghttp://i44.tinypic.com/nmjig4.jpgNote: I hadn't calibrated the temperatures yet in this picture, so that's why the PVs for the three PIDs are all reading different room temperatures. And, yes, I know the middle one isn't currently connected to an SSR.
Check out this video for an example of what I am talking about:http://youtu.be/SAPQVwNdjV8?t=30s
In this next video, I tinker with the SV some more to narrow down which temperatures will cause the controller to misread the PV.http://www.youtube.com/watch?feature=player_embedded&v=kbVs1Bs1di8Between 10-30°, I'm getting a consistent PV reading.
10.3° SV = 42.9° PV
20.3° SV = 42.9° PV
30.3° SV = 42.9° PVWhen I hit 40° (close to the actual temperature, but a little under) the PV reading drops 2°.
40.3° SV = 40.9 PVIf I set the SV over the real reading, it goes back to reading the normal PV.
50.5° SV = 42.9 PVLastly, I demonstrate that the reading gets more and more off the closer I get to the real temperature reading.
33.3° SV = 42.8 PV
35.3° SV = 42.4 PV
37.3° SV = 41.9 PV
39.3° SV = 41.5 PV
All of my PIDs are having this same problem, and I have tried swapping the probes. Maybe it is something that could be adjusted in the settings.
If it helps, here is a copy of the manual and a transcription of all of the PID's current settings:http://www.rkcinst.co.jp/english/pdf_ma%20...%20zc21e1.pdfOption -Setting- Explanation
AL1 -000.0- Alarm 1
ATU -0000- Auto-tune
P -12.3- Proportional Band
I -88- Integral Time
d -22- Derivative Time
AR -51- Anti Reset Wind-up
T -2- Heat Side Proportioning
SC -000.0- ????
LCK -1000- Set Data Lock
after the lock I get these options with these settings:Option -Setting- Explanation
COD - 0000 - ????
SL1 - 1000 - Input Type
SL2 - 0000 - Temperature Type and Cooling Type
SL3 - 0000 - ????
SL4 - 0000 - Alarm 1 Type
SL5 - 0000 - Alarm 2 Type
SL6 - 0001 - ????
SL7 - 0000 - ????
SL8 - 0000 - ????
SL9 - 0000 - ????
SL10 - 1001 - ????
SL11 - 0000 - ????Changing COD to 0001 brings up these options:
SLH - 100 - Setting Limiter High
SLL - 000.0 - Setting Limiter Low
PGdP - 3 - ????
oH - .2 - Differential Gap Setting
dF - 1 - ????
-Yes, these PIDS are the model meant for running an SSR
-Yes, I'm using pt100 probes and I have the PIDS set up for them
-Water is not getting into the probes
SO! Do any of you have any ideas as to what I could do to get these things running correctly?