HIDRIA 0310-4-0131 Manual do utilizador - Página 6
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05
SPEED CONTROL
Rotation speed of a variable speed fan can be controlled by various signals:
- Linear voltage input (0-10V) or PWM input (PWM duty cycle 0-100%).
- MODBUS RTU protocol (Additional information are in documentation "Hidria EC Modbus parameters" and on www.modbus.org.
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
0
1.2 V
Input Voltage (0...10 V)
HYSTERESIS
10%
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
10%
1.2V
© Copyright HIDRIA d.o.o., All rights reserved. Document is subject to change without prior notification.
5 V
10 V
1,2V
Input voltage (0...10V)
10V
Input voltage (0...10V)
USER'S GUIDE R10 AXIAL FAN , Code: 0000, Iss: 9.07.2019
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
10%
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.
8V
10V
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