Delta VFD4A8MS23ANSAA User Manual

Chapter 12 Descriptions of Parameter SettingsMS300
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adjustment time; however, the differential operation increases noise interference. Note that a too
large differential causes more noise interference. In addition, the differential shows the change
and the differential output is 0 when there is no change. Note that you cannot use the differential
control independently. You must use it with the other two controllers for the PD controller or PID
controller.
 Sets the D controller gain to determine the deviation change response. Using a suitable
differential time reduces the P and I controllers overshoot to decrease the oscillation for a stable
system. A differential time that is too long may cause system oscillation.
 The differential controller acts on the change in the deviation and cannot reduce the
interference. Do not use this function when there is significant interference.

08-04
Upper Limit of Integral Control
Default: 100.0
Settings
0.0–100.0%
 Defines an upper bound for the integral gain (I) and therefore limits the master frequency.
 The formula is: Integral upper bound = Maximum Operation Frequency (Pr.01-00) × (Pr.08-04%).
 An excessive integral value causes a slow response due to sudden load changes and may
cause motor stall or machine damage. If so, decrease it to a proper value.

08-05
PID Output Command Limit (Positive Limit)
Default: 100.0
Settings
0.0–110.0%
 Defines the percentage of the output frequency limit during the PID control. The formula is
Output Frequency Limit = Maximum Operation Frequency (Pr.01-00) × Pr.08-05%.

08-06
PID Feedback Value by Communication Protocol
Default: 0.00
Settings
-200.00–200.00%
 Use communications to set the PID feedback value when the PID feedback input is set to
communications (Pr.08-00 = 7 or 8). 

08-07
PID Delay Time
Default: 0.0
Settings
0.0–2.5 sec.
08-20
PID Mode Selection
Default: 0
Settings
0: Serial connection
1: Parallel connection
 0: Use conventional PID control structure.
1: The proportional gain, integral gain and differential gain are independent. You can customize
the P, I and D value to fit your application.
 Pr.08-07 determines the primary low pass filter time when in PID control. Setting a large time
constant may slow down the drive’s response speed.

Delta VFD4A8MS23ANSAA Specifications

General

Brand	Delta
Model	VFD4A8MS23ANSAA
Category	DC Drives
Language	English