5.36. RAMP

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Purpose

To limit the rate of change of the input signal (value per second). This component can for instance be used to limit the rate of opening or closing a valve

Procedure

The input signal is limited to a maximum rate of change. Different rates are allowed for increases and decreases in the input signal.

Parameters

Parameter

input

unit

range

default

remarks

Ramp increase

real

Ramp decrease

real

Remarks

None.

Examples

Figure 1 presents the input and output signals for a ramp component. The thin green line represents the input signal, while the thick red line represents the output signal. The input signal is a block function. The used ‘ramp increase’ parameter is 1, that means that the maximum change per second is 1 and it takes 10 seconds to reach the required input value. The used ‘Ramp decrease’ parameter is 2; so it takes 5 seconds to change from 10 to 0.

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Fig. 5.36.1 Input and output signals for RAMP (incr = 1, decr = 2)

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Fig. 5.36.2 Input and output signals for RAMP (incr = 1, decr = 2)