Rockwell-automation SP600 User Manual Version 3.0 Instrukcja Użytkownika Pobierz pdf (Strona 131)

Parameter Descriptions

11-29

Selects specific features of the PI regulator (see appendix E.)

Proportional control (P) adjusts the output based on the magnitude

of the error (larger error = proportionally larger correction). If the

error is doubled, then the output of the proportional control is

doubled; and, conversely, if the error is cut in half, then the output of

the proportional output will be cut in half. With proportional control

only, there is always an error, so the feedback and the reference are

never equal.

Integral control (I) adjusts the output based on the duration of the

error. The longer the error is present, the larger the correction

output value will become. The integral control by itself is a ramped

output correction and typically gives a smooth output correction and

will continue to integrate until zero error is achieved. By itself,

integral control is slower than many applications require and

therefore is combined with proportional control (PI). It also

contributes to overshoot of the correction value.

Bit 0 - Excl Mode (Exclusive Mode)

• Enabled = Selects speed regulation (PI output used as

speed command).

• Disabled = Selects trim regulation (PI output summed with

speed command).

Bit 1 - Invert Error

• Enables/disables the option to invert the sign of the PI error

signal. Enabling this feature creates a decrease in output for

an increasing error and an increase in output for a

decreasing error.

Bit 2 - Preload Mode

124 PI Configuration

Range: See figure 11.10

Default: See figure 11.10

Access: 2 Path: Speed Command>Process PI

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Rockwell-automation SP600 User Manual Version 3.0 Instrukcja Użytkownika Strona 131