Tamson Instruments bv, van 't Hoffstraat 12, 2665 JL Bleiswijk, Netherlands
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+31(0)10 – 522 43 73 Fax. +31(0)10 – 521 19 41
\\word\manuals\tlv25\\mantlv25.doc Date 09-2010 Rev. 1.31 UK
pag. 12 / 26
Automatic tuning
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Chose desired set point,
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Wait until the bath has reached the set point temperature,
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Choose with key Atune,
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Press key option “Tune”,
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Choose with key “on”,
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Press key and simultaneous, the display will show alternating the word “tune”.
The controller will shortly oscillate the temperature in the bath and from the reaction of the bath it will
calculate the “P”, “I” and “D” parameter. It will store these parameters and returns to its controlling function.
The bath will show its actual temperature on the display. The tuning parameters are kept in memory after
power has been shut off.
The time needed for auto tuning the system depends mainly on the cool-down time of the bath. Due to
thermo dynamic law the tuning time behaves like an exponential function of the bath temperature.
Auto tuning should in all cases give you an optimal result. There are cases in which you want to tune by hand
and set the PID parameters yourself. Following will describe how to manage that.
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Choose set point temperature,
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Wait until the bath has reached its set point temperature,
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Choose key to show PID,
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Press for Ti or Td parameter,
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Change the value or press enough times so that the display shows “Off”,
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Choose with Atune,
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Press to show “Tune”,
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Press for “on”,
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Press and to confirm tuning and display will alternate “tune” and bath temperature,
If PI or P control has been chosen, the reached end temperature in the bath will always deviate from the set
point temperature. To eliminate this error, the value off the error has to be appointed to the rES parameter in
the PID menu. This parameter will only be visible when P or PI control is activated.
To eliminate the error offset do following:
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Choose PID with ,
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Press for rES,
Tip. To allow optimal temperature control of the bath fluid, the bath has to be tunded
after following changes:
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Other type of fluid used in the bath,
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Change of fluid level
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Setoint which deviates more than 5
°°°°
of previous tuning set point,
