Upper Limit Of Integral Control; Pid Output Frequency Limit; Pid Delay Time; Pid Mode Selection - Honeywell VFD CORE Installation Instructions Manual

• If the integral time is set as 0.00, Pr.08-02 will be disabled.
08 - 03 Derivative Control (D)
Settings
• The differential controller is used to show the change of system error and it is helpful to preview the change of error. So the
differential controller can be used to eliminate the error to improve system state. With the suitable differential time, it can
reduce overshoot and shorten adjustment time. However, the differential operation will increase the noise interference. Please
note that too large differential will cause big noise interference. Besides, the differential shows the change and the output of
the differential will be 0 when there is no change. Therefore, the differential control can't be used independently. It needs to be
used with other two controllers to make a PD controller or PID controller.
• This parameter can be used to set the gain of D controller to decide the response of error change. The suitable differential time
can reduce the overshoot of P and I controller to decrease the oscillation and have a stable system. But too long differential
time may cause system oscillation
• The differential controller acts for the change of error and can't reduce the interference. It is not recommended to use this
function in the serious interference.
08 - 04

Upper limit of Integral Control

Settings
• This parameter defines an upper bound or limit for the integral gain (I) and therefore limits the Master Frequency. The formula
is: Integral upper bound = Maximum Output Frequency (Pr.01-00) x (Pr.08-04%).
• Too large integral value will make the slow response due to sudden load change. In this way, it may cause motor stall or
machine damage
08 - 05

PID Output Frequency Limit

Settings
• This parameter defines the percentage of output frequency limit during the PID control. The formula is Output Frequency Limit
= Maximum Output Frequency (Pr.01-00) X Pr.08-05%.
08 - 06

PID Delay Time

Settings
08 - 19

PID Mode Selection

Settings
• PI Control: controlled by the P action only, and thus, the deviation cannot be eliminated entirely. To eliminate residual
deviations, the P + I control will generally be utilized. And when the PI control is utilized, it could eliminate the deviation
incurred by the targeted value changes and the constant external interferences. However, if the I action is excessively
powerful, it will delay the responding toward the swift variation. The P action could be used solely on the loading system that
possesses the integral components.
• PD Control: when deviation occurred, the system will immediately generate some operation load that is greater than the load
generated single-handedly by the D action to restrain the increment of the deviation. If the deviation is small, the effectiveness
of the P action will be decreasing as well. The control objects include occasions with integral component loads, which are
0.00~1.00 seconds
0.0~100.0%
0.0~110.0%
0.0~35.0 seconds
0: Serial connection
1: Parallel connection
CHAPTER 12: DESCRIPTION OF PARAMETER SETTINGS
207
Factory Setting: 0.00
Factory Setting: 100.0
Factory Setting: 100.0
Factory Setting: 0.0
Factory Setting: 0
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