EZT-570S User Manual
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Entering a Soak Step
The set point entry for a step defines the target set point, i.e., the set point that will be achieved by the
end of the step. Thus, if the set point of the step matches the set point for the control loop from the
previous step, the loop will soak, i.e., remain at that set point for the entire step creating a soak step.
When adding (inserting) steps into the program, the new step assumes the same set points and
events as the current step. Thus, as steps are added, the new step is automatically a soak step. By
simply adjusting the time of the new step, soak step entry would be complete.
Entering a Ramp Step
A ramp step is merely a step with a set point that is different from the previous step. The loop’s set
point will then ramp from the previous set point, to the set point of the current step, linearly over the
time entered for the step. This creates a ramp step.
When adding (inserting) steps into the program, the new step assumes the same set points and
events as the current step. Thus, as steps are added, the new step is automatically a soak step. By
simply changing the set point for a loop, the step becomes a ramp step. Adjusting the time length of
the step will then vary the ramp rate.
4.1.2.1
Entering Ramp Rate
In order to enter a ramp rate, you can either calculate the time it will take to go from the previous
step’s set point to the current step’s set point at the desired ramp rate and enter the time for the step
directly, or you can enter the ramp rate on the numeric keypad when entering the loop set point.
For example, if you desire a ramp rate of 0.5 degrees per minute from the previous step’s 24 degree
set point to the new 85 degree set point, the step time will be the difference in temperature (61
degrees) divided by the rate of 0.5 degrees per minute. This equates to a time period of 122 minutes
(2 hours and 2 minutes). Thus, the step would require a set point entry of 85 degrees and a time
entry of 2 hours, 2 minutes.
Or, when entering the loop set point for the ramp step of 85 degrees, you could specify a ramp rate
by touching the ramp rate field on the numeric keypad and then enter the desired ramp rate of 0.5
degrees.
Figure 4-3 Set Point (Ramp Rate) Entry
Summary of Contents for EZT-570S
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