Parameter listing and descriptions
277
ACH550-01 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 gain of the PID controller.
• 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 setpoint 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
AI
1 or 1306
FILTER
AI
2 until the noise
is filtered from the signal.
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