Direct answer: To achieve 0-10V speed regulation by EFU, three levels need to be confirmed: signal wiring, that is, the analog input terminal and the common terminal; control mode, that is, switching the EFU control card to 0-10V analog mode; speed calibration, that is, confirming the rotation speed or wind speed corresponding to 0V and 10V, and the status when the signal is lost. After the wiring is completed, adjust the fan speed through the external 0-10V signal or the device PLC analog output; during calibration, you need to confirm the corresponding relationship between voltage and speed, and set the safe state when the signal is abnormal.

0-10V speed regulation is a common control method when the EFU is linked to the equipment PLC or host system. The following will start from four aspects: signal wiring, control mode, speed calibration and abnormal status.

1. 0-10V signal wiring method

EFU's 0-10V analog control usually involves the following terminal blocks:

Some control cards use 2-pin terminals for analog control and provide DC millivolt signal output to read speed and motor torque percentage. For EC fans, common wiring includes: one wire for fixed 10VDC output, one wire for 0-10VDC input, one wire for ground, and one wire for speed signal.

Please note when wiring:

1. It is recommended to use shielded wires for analog signal lines, and the shielding layer should be grounded at one end;

2. Signal lines and power lines are routed separately to reduce interference;

3. Confirm the range and polarity requirements of the analog input of the EFU control card.

2. Control mode switching

Most EFU control cards support multiple control modes, 0-10V analog control is only one of them. Common patterns include:

• Local manual control: adjust the speed through the potentiometer on the board;

• Analog remote control: adjusted through external 0-10V signal;

• Network control: controlled through communication protocols such as RS485 and Modbus.

Control mode is usually selected via DIP switches or parameter settings. Some control cards provide three options: network speed control, manual speed control and analog speed control. After switching modes, you usually need to power off and restart to take effect.

For Aili Industrial EFU, the control method can be configured as potentiometer, 0-10V, Modbus or wireless monitoring and other solutions according to the equipment requirements. Some products support stepless adjustment of wind speed and can be controlled through 0-10V signals. Related products can be referencedEquipment-side fan filter unit (EFU) and70mm ultra-thin EFU。

3. Speed ​​calibration method

The core of 0-10V speed regulation is to confirm the corresponding relationship between the voltage signal and the fan speed or face wind speed. The recommended calibration steps are as follows:

Step 1: Confirm the control scope

Determine the EFU's minimum and maximum operating rpm or wind speed. Some control cards support setting the minimum set point, which can limit the minimum speed range corresponding to the 0-10V signal.

Step 2: Measure the correspondence

• Input 0V signal to record whether the fan stops or maintains the minimum speed;

• Input 10V signal and record whether the fan reaches the maximum speed;

• Measure separately at the midpoint to confirm whether the correspondence is smooth.

Step 3: Confirm the correspondence between signal and speed

For EC fans, the 0-10V signal usually corresponds to a certain range of modulation levels or speed ranges. The actual correspondence must be based on the technical documentation of the EFU control card.

Step 4: Record calibration data

Record the corresponding relationship between voltage and speed in the equipment debugging file to facilitate subsequent maintenance and fault diagnosis.

4. Abnormal status settings

The abnormal status setting of 0-10V speed regulation mainly involves signal abnormality and fan abnormality.

4.1 Signal abnormal status

Some EFU control cards are in analog mode, and the operating status and set values ​​are determined by analog signals, so it is necessary to confirm the safe behavior when there is no signal.

4.2 Abnormal status of fan

• Abnormal speed feedback: If the EFU provides a speed feedback signal, you can determine whether the fan is operating normally by comparing the set speed and feedback speed;

• Abnormal current: Some control cards can monitor the motor current to determine whether it is overloaded or blocked;

• Communication anomalies: Even if 0-10V analog control is used, some control cards can still respond to communications, enabling status monitoring and abnormal reporting.

4.3 Alarm setting options

Universal controllers usually provide a variety of alarm modes, including input high and low limit alarms, feedback or output alarms, analog feedback alarms, etc. The appropriate alarm mode can be selected according to project requirements, and the output behavior when abnormality is determined through the alarm or interlock mode.

5. Information required for 0-10V speed regulation configuration

It is recommended to provide: when communicating with the project:

1. EFU model and control card specifications;

2. Analog output specifications of the equipment PLC or control system;

3. Target wind speed range and corresponding voltage;

4. Signal line length and wiring environment;

5. Whether a speed feedback signal is needed;

6. The expected state when the signal is abnormal;

7. Whether local manual control needs to be retained at the same time;

8. Whether it needs to coexist with the communication method.

6. Aili Industrial EFU control supporting capabilities

The control system of Aili Industrial EFU is independently developed and the control method can be configured according to the equipment requirements. For 0-10V speed regulation requirements, the EC or DC fan solution can be combined to achieve stepless speed regulation and be connected to the equipment PLC or upper-level system. More products are available for referenceCustom EFU andDC EFU equipment fan filter unit。

FAQ

Which terminal is connected to the 0-10V signal of the EFU?

Usually connected to the analog input terminal and common terminal on the control card. The specific terminal definitions are subject to the EFU control card manual.

Will the EFU stop at 0V signal?

uncertain. 0V may correspond to stop, minimum speed or maintain the previous state, depending on the settings of the control card, which needs to be confirmed during debugging.

Does the 10V signal correspond to the highest speed?

Usually corresponds to the maximum rotation speed or a certain range of modulation levels, which is actually subject to the control card specifications.

How to switch EFU to 0-10V control mode?

The analog control mode is usually selected through DIP switches or parameter settings. After switching, it needs to be powered off and restarted to take effect.

Can I use ordinary wires for the 0-10V signal line?

It is recommended to use shielded wires and run them separately from power wires to reduce signal interference.

Can the EFU provide speed feedback?

Some models provide speed feedback signal output, which can read speed or pulse signals. Please confirm whether the control card supports it.

What happens to the EFU when signal is lost?

Depends on exception status settings. It is recommended to confirm the behavior when there is no signal during debugging and set it according to the device safety requirements.

Can 0-10V speed regulation be used with Modbus at the same time?

Some control cards support simultaneous response communication for analog control and can realize status monitoring. Please confirm the specifications of the control card.