GMC-I Messtechnik GmbH
R2500–23
Setpoint Ramps
Function
The parameters
SPuP
/
SPdn
cause a gradual temperature change (rising / falling) in degrees per minute.
Activated by:
– Switching auxiliary power on
– Changing the momentary setpoint, activating setpoint 2
– Switching from manual to automatic operation
Setpoint display
The targeted setpoint is displayed (not the currently valid setpoint) with a blinking
r
at the left-hand digit.
Limit values
Relative
limit values make reference to the ramp, not the targeted setpoint. As a rule, no alarm is triggered for this reason.
Suppression of Periodic Disturbances
If the measured value is superimposed with highly periodic oscillation which, for example, occurs due to cyclical withdrawal of energy from the control
loop, the manipulated value may fluctuate between its extreme values resulting in unsatisfactory control results.
If the period is constant, this oscillation can be filtered out by setting the period in the
oscillation suppression
tSUP
parameter. This is accomplished
by means of narrow-band filtering in order to remove the signal component with the selected period, which is then disregarded for measuring signal
control. The actual values for the display are not influenced.
As opposed to adaptive measured value correction (see also page 24), oscillation can also be suppressed with this function whose periods are greater
than half of the system’s delay time.
Periods can be selected within a range of 0.3 to 25 seconds, and the filter remains inactive for other setting values.
Due to the fact that this suppression filter influences control dynamics, ascertainment of control parameters by means of self-tuning or manual
optimization has to be performed while oscillation suppression is active.
Summary of Contents for R2500
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