Delta Electronics VFD-L Series Spezifikationen PDF herunterladen (Seite 52)

VFD-M Series

5-26

Pr.49

Potentiometer Bias Polarity

Factory Setting: 00

Settings 00 Positive Bias

01 Negative Bias

 This parameter sets the potentiometer Bias Frequency to be positive or negative.

Pr.50

Potentiometer Frequency Gain

Factory Setting: 100.0

Settings 0.10 to 200.0% Unit: 1%

 This parameter sets the ratio of analog input vs frequency output.

Pr.51

Potentiometer Reverse Motion Enable Factory Setting: 00

Settings 00 Reverse Motion Disabled in negative bias

01 Reverse Motion Enabled in negative bias

 Pr.48 to Pr.51 are used when the source of frequency command is the analog signal (0 to

+10V DC or 4 to 20mA DC). Refer to the following examples.

Example 1:

Set Pr.00=1 to command frequency with the potentiometer on keypad or Pr.00=2 (4 to 20mA

current signal) potentiometer/current signal of external terminal.

Max.

Output

Freq.

60Hz

Pr.03

0Hz

12m

10V

20m

Factory Settings

Pr.03=60Hz--Max. output Freq.

Pr.48=0%--bias adjustment

Pr.49=0 -- bias polarity

Pr.50=100% -- pot. freq. gain

Pr.51=0 -- REV disable in

negative bias

Potentiometer Scale

10V

Example 2:

A Bias Adjustment (16.7% of 60Hz) determines the Output Frequency to be 10 Hz with the

potentiometer set at 0V as shown. Notice that the entire V/F is transposed accordingly. An

analog input voltage 0-8.33V (or current 4-13.33mA) would set frequency as 0-60Hz.Once the

Maximum Output Frequency is reached any further increase on the potentiometer will not

increase output frequency (If you want to use the range of 60Hz, please refer to the example

3).

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