Rockwell-automation SP600 User Manual Version 3.0 Manual de usuario descargar pdf (Pagina 132)

11-30

SP600 AC Drive User Manual

• Enabled = Initializes the PI integrator to the commanded

speed while the PI is disabled.

• Disabled = The PI integrator is loaded with the PI Pre-load

(133) while the PI is disabled.

Bit 3 - Ramp Ref

• Enables/disables ramping the PI reference using PI

Feedback as the starting point and ramping to the selected

PI Reference after PI is enabled. The active accel time is

used for the PI ramp reference slew rate. The ramping is

bypassed when the reference equals the setpoint. The ramp

used is set by the active ramps (parameters 140 to 143).

Bit 4 - Zero Clamp

• Enables/disables option to limit operation so that the output

frequency at the PI regulator always has the same sign as

the master speed reference. This limits the possible drive

action to one direction only. Output from the drive will be from

zero to maximum frequency forward or zero to maximum

frequency reverse.

Bit 5 - Feedback Sqrt (Square Root Feedback)

• Enables/disables the option of using the square root of the

feedback signal as the PI feedback. This is used for pressure

control because fans and pumps vary pressure with the

square of the speed.

Bit 6 - Stop Mode

• When enabled, and a stop command is issued to the drive,

the PI loop will continue to operate during the decel ramp.

When disabled, the drive will perform a normal stop.

Bit 7 - Anti Wind Up

• When enabled, the PI loop will automatically prevent the

integrator from creating an excessive error that could cause

instability. The integrator will be controlled without the need

for PI Reset or PI Hold inputs.

Controls the PI regulator. You can use a Datalink parameter or an

assigned digital input to write to this parameter.

PI control allows the drive to take a reference signal (setpoint) and

an actual signal (feedback) and automatically adjust the speed of

the drive to match the actual signal to the reference.

125 PI Control

Range: See figure 11.11

Default: See figure 11.11

Access: 2 Path: Speed Command>Process PI

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Rockwell-automation SP600 User Manual Version 3.0 Manual de usuario Pagina 132