HIDRIA 0318-4-1006 사용자 설명서 - 페이지 7

{카테고리_이름} HIDRIA 0318-4-1006에 대한 사용자 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. HIDRIA 0318-4-1006 10 페이지.

SPEED CONTROL DIAGRAM

Rotation speed of a variable speed fan can be controlled by various signals:

- Linear voltage input (0-10V) or current input (4-20mA) or PWM input (PWM duty cycle 0-100%).

- MODBUS RTU protocol (Additional information are in documentation "Hidria EC Modbus parameters".

Linear voltage input is the most common and it is described below. The current input is also widely used, where long cables are necessary. PWM input

is used for electromagnetic noisy environments. PWM signal must be in square form with polarity the same as for linear voltage input (see connection

diagram). PWM duty cycle 0-100% correspond to 0-10V linear voltage input if the amplitude of the PWM voltage is Vp=10V. Amplitude of PWM signal

must not exceed 12Vp.

LINEAR VOLTAGE INPUT:

SPEED CONTROL DIAGRAM

1200

1000

800

600

400

200

1.2 V

Input Voltage (0...10 V)

HYSTERESIS

1.0V

Linear input is factory adjusted to fit the customer's sensor or other speed control reference. The input characteristic can be factory adjusted in terms of

increasing input sensitivity or attenuation.

For example: An air-cooled condenser is using a pressure sensor 0-20Bar => 0-10V, but the highest system pressure reached at maximum load is

16Bar => 8V. For optimal operation of the application the fan mounted on a condenser should run at max speed at 8V of input control voltage. In order

to achieve that, we need to adjust the input characteristic in a way the picture shows.

INPUT CHARACTERISTIC ADJUSTMENT

100%

Fan speed

1.2V

5 V

10 V

1,2V

Input voltage (0...10V)

10V

Input voltage (0...10V)

USER'S GUIDE R18 AXIAL FAN , Iss: 6.05.2021

Speed of a fan increases linearly with input voltage.

The fan operates in two different modes:

0-1.2 V...... Standby or stop mode

1.2-10 V..... Run mode

1.0-1.2V .....Hysteresis

In order to prevent cycling from standby to run mode or run to standby

mode a small hysteresis is implemented. The default value is

approximately 200mV.

Hysteresis can be factory-adjusted in order to achieve customer

requirements.

CONTROL DIAGRAM

100%

adjusted

input curve

Fan speed

1.2V

Input voltage (0...10V)

Linear voltage input (0-10V DC) can be used as 0 (4)-20mA current

input with an additional resistor of 500 Ohms between GND and 0-10V

connection.

10V

7 / 10