ABB ACH550 Bedienungsanleitung PDF herunterladen (Seite 273)

Parameter listing and descriptions 269

ACH550 User's Manual

Group 40: Process PID Set 1

This group defines a set of parameters used with the Process

PID (PID1) controller.

Typically only parameters in this group are needed.

Code Description Range

4001 GAIN 0.1...100

Defines the PID Controller’s gain.

• The setting range is 0.1... 100.

• At 0.1, the PID Controller output changes one-tenth as much as

the error value.

• At 100, the PID Controller output changes one hundred times as

much as the error value.

Use the proportional gain and integration time values to adjust the

responsiveness of the system.

• A low value for proportional gain and a high value for integral time

ensures stable operation, but provides sluggish response.

If the proportional gain value is too large or the integral time too

short, the system can become unstable.

Procedure:

• Initially, set:

• 4001

GAIN = 0.0.

• 4002

INTEGRATION TIME = 20 seconds.

• Start the system and see if it reaches the set point quickly while

maintaining stable operation. If not, increase

GAIN (4001) until the

actual signal (or drive speed) oscillates constantly. It may be

necessary to start and stop the drive to induce this oscillation.

• Reduce

GAIN (4001) until the oscillation stops.

•Set

GAIN (4001) to 0.4 to 0.6 times the above value.

• Decrease the

INTEGRATION TIME (4002) until the feedback signal (or

drive speed) oscillates constantly. It may be necessary to start and

stop the drive to induce this oscillation.

• Increase

INTEGRATION TIME (4002) until the oscillation stops.

•Set

INTEGRATION TIME (4002) to 1.15 to 1.5 times the above value.

• If the feedback signal contains high frequency noise, increase the

value of Parameter 1303

FILTER AI1 or 1306 FILTER AI2 until the

noise is filtered from the signal.

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