Delta PG-40 Specifications download pdf (Page 105)

VFD-B Series

5-70

Note: The parameter can be set during operation.

10 - 04

Derivative Control (D) a

Factory Setting: 0.00

Settings 0.00 to 1.00 sec

 This parameter specifies derivative control (rate of change of the input) and associated

gain (D). With this parameter set to 1, the PID output is equal to differential time X

(present deviation − previous deviation). It increases the response speed but it may cause

over-compensation.

Note: The parameter can be set during operation.

10 - 05

Upper Bound for Integral Control

Factory Setting: 100

Settings 00 to 100 % Unit: 1 %

 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.10-05). This parameter can limit the Maximum Output Frequency

10 - 06

Primary Delay Filter Time

Factory Setting: 0.0

Settings 0.0 to 2.5 sec Unit: 0.1 sec

 (1) To avoid amplification of measurement noise in the controller output, a derivative

digital filter is inserted. This filter helps in smoothing oscillations.

(2) When Pr.02-01 is set to 01 or 02, the set point (Master Frequency) for PID control is

obtained from the AVI external terminal (0 to +10V) or from multi-step speed. When

Pr.02-01 is set to 00, the set point is obtained from the keypad.

The complete PID diagram is the following:

10-02

10-03

10-04

10-05

10-01

10-07

10-06

10-00

Setpoint

Input Freq.

Gain

PID

feedback

Integral

gain

limit

Output

Freq.

Limit

Digital

filter

Freq.

Command

10 - 07

PID Output Frequency Limit

Factory Setting: 100

Settings 00 to 110 % Unit: 1%

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 178 179

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Delta PG-40 Specifications Page 105

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