Application samples (2)

  Remote control by 4-20mA analog signal

By receiving a 4-20mA analog signal from an external controller, the inverter controls airflow as best.

   Connection diagram of the VF-nC1

Title

Function

Setting range

Recommended setting

Command mode selection

0: Remote, 1: Local

0

Frequency setting mode selection

0: Remote, 1: Built-in potentiometer, 2: Operation panel

0

Analog input/logic input function selection

0 to 2

1

VI/S3 reference point 1 setting

0 to 100%

20 %

VI/S3 reference point 2 frequency

0 to 200Hz

60 Hz

The inveter compares two signal and controls that the feedback signal is to be target temperature.
- Target temperature: Inverter's operating frequency
- Feedback signal: From a temperature sensor

ex.
Specifications of a temperature sensor:
 4mA = 0 degreeC, 20mA = 50 degreeC

Target temperature:
 20Hz operation frequency
  = 20 Hz / 60 Hz x 50 degreeC = 16.7 degreeC
 40Hz operation frequency
  = 40 Hz / 60 Hz x 50 degreeC = 33.3 degreeC
 60Hz operation frequency
  = 60 Hz / 60 Hz x 50 degreeC = 50 degreeC

Title

Function

Setting range

Recommended setting

Command mode selection

0: Remote, 1: Local

0

Frequency setting mode selection

0: Remote, 1: Built-in potentiometer, 2: Operation panel

0

Upper limit frequenct

0.5 ~ Maximum frequency[FH]

60

Preset speed frequency 1

Low limit frequency[LL] ~ Upper limit frequency[UL]

20 Hz

Preset speed frequency 2

Low limit frequency[LL] ~ Upper limit frequency[UL]

40 Hz

Preset speed frequency 4

Low limit frequency[LL] ~ Upper limit frequency[UL]

60 Hz

Input terminal function (R)

0 to 57

8

Analog input/logic input function selection

0 to 2

1

VI/S3 reference point 1 setting

0 to 100%

20 %

VI/S3 reference point 2 frequency

0 to 200Hz

60 Hz

PI control

0: Disabled, 1: Enabled

1

Proportional (P) gain

0.01-100.0

Depends on application

Integral (I) gain

0.01-100.0

Depends on application