Chapter 12 Description of Parameter Settings
CT2000 Series
12.1-08-4
Upper limit of Integral Control
Factory
Setting:100.0
Settings 0.0~100.0%
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.
PID Output Frequency Limit
Factory
Setting:100.0
Settings 0.0~110.0%
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 %.
PID feedback value by communication protocol
Factory Setting: Read only
Settings -200.00~200.00%
PID Delay Time
Factory Setting: 0.0
Settings 0.0~35.0 sec
PID Mode Selection
Factory Setting: 0
Settings 0: Serial connection
1: Parallel connection
Pr.08-07 determines the primary low pass filter time when in PID control. Setting a large time
constant may slow down the response rate of drive.
Output frequency of PID control will filter by primary low pass function. This function could filtering
a mix frequencies. A long primary low pass time means filter degree is high and vice versa.
Inappropriate setting of delay time may cause system error.
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 controlled by the
P action only, and sometimes, if the integral component is functioning, the whole system will be
vibrating. On such occasions, in order to make the P action’s vibration subsiding and the system
Summary of Contents for CT2000 Series
Page 5: ...Chapter 1 Introduction CT2000 Series 1 2 Model Name VFD 750 CT 43 F 00 A6 Serial Number...
Page 22: ...Chapter 1 Introduction CT2000 Series 1 19 Digital Keypad KPC CC01 KPC CE01 Unit mm inch...
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Page 71: ...Chapter 7 Optional Accessories CT2000 Series 7 18 Wall Mounting Embedded Mounting...
Page 87: ...Chapter 8 Optional Cards CT2000 Series 8 8 PG Card intallation...
Page 88: ...Chapter 8 Optional Cards CT2000 Series 8 9 Disconneting the extension card...
Page 92: ...Chapter 8 Optional Cards CT2000 Series 8 13 PG2 Wiring Diagram...
Page 95: ...Chapter 8 Optional Cards CT2000 Series 8 16 PG2 Wiring Diagram...
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Page 489: ...Chapter 16 PLC Function CT2000 Series 16 48 LD X1 Load Contact a of X1 OUT Y1 Drive Y1 coil...
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