JUMO DICON touch - Page 87

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12 Configuration
Optimization according to the step response method
Initially, a configurable standby output is produced until the actual value "settles" to a constant.
This is automatically followed by a configurable output level step (step size) to the control path.
Main applications of the step response method:
• Optimization immediately after "power on" during startup (considerable time saving, stand-
by output setting = 0 %)
• Control process does not oscillate easily (for example, extremely well insulated furnace with
low losses, long oscillation period)
• Actual value must not exceed the setpoint value
If the output level is known for the corrected setpoint value, overshooting is prevented with
the following setting:
Standby output + step size ≤ output level in corrected state
The progression of the output level and actual value depends on the status of the process at
the point when autotuning starts:
Autotuning
during the startup phase
Autotuning
during operation
t
y
S
y
t
x
w
t1
t2
t3
}
Dy
{
y
x
y
S
t1
t2
t3
Dy
t
t
w
y Output level ΔyStep size
y
S
Standby output t1 Start of autotuning
x Actual value t2 Time of output level step
w Setpoint value t3 End of autotuning