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>Program Mode ON
Output Hi L im i t 100
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Program Mode ON
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Output H i L im i t 100
Output H i L im i t 95
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Program Mode ON
SET
>Output H i L im i t 100
Temp Unit F
Figure 27. Access the parameters in System Config menu.
Note 12. Program Mode:
Multi-step program switch. By default, this controller is set to
multi-step mode, and this parameter is set to “ON”. If you want to change it to single-step
mode, please change this parameter to “OFF”. For details regarding multi-step mode,
please check section 4.1.3
Note 13. Output Hi/Lo Limit:
It is expressed as a percentage value. This function will
allow you to control the maximum and minimum output power delivered by the heater.
For example, if you set
Output Hi Limit
= 50 and your heater is 1000 watts, the output
will use 50% of the 1000 watts as the full output. It thinks the 1000W heater as a 500W
heater. When the PID algorithm determines 50% output value, the actual power output
will be 250 watts. This function can be used in two situations.
1) When you have a very powerful heater and using a very small pot of water to cook at
very low temperature, for example, a 1400 watts heater with a one litter (1 qt) pot of
water at 130°F, the heater is too powerful for the small water volume. The moment it is
on, it releases too much energy to cause the temperature to overshoot. Although it is still
possible to stabilize the temperature with proper PID parameters, it is much easier to
control if you limit the maximum output to 25%. Ideally, an optimized temperature control
system should consume about 25% of the heater power at set temperature (steady
state). For example, if you found out that only 50 watts of energy is needed to maintain
the temperature at 60°C (141°F), ideally you should use only 200 watts heater for this job.
Too much power will make the system over react too quickly. Too little power will make
the system too slow in response. By using the Out function, you can make the 1400
watts heater to act as a 200 Watts heater for stable temperature control.