3 Frequently Asked Questions about Small Electronic Diaphragm Pump Speed ​​Regulation

Q: Can Hilin small electronic diaphragm pump be regulated and controlled by PLC?

A: Most of Hilin small electronic diaphragm pumps have speed adjustment function. Among them, pumps with functions such as PWM speed adjustment, voltage speed adjustment, frequency speed adjustment and 485 communication (based on Modbus communication protocol) can be used for PLC control speed adjustment. Customers who use PWM speed control and frequency speed control need to note that the low level range of the PWM and frequency control pulse signals of Hilin small electronic diaphragm pumps is: 0V-0.8V, the high level range is: 3.3V-5V, and the input high The level cannot exceed 5v, otherwise it may cause permanent damage to the small electronic diaphragm pump.

The output pulse signal amplitude of most PLC pulse generators is 24V. Therefore, some PLCs cannot directly output pulse signals to control the small electronic diaphragm pump. An optocoupler isolation conversion module is required to convert the 0-24v pulse signal into 0-5v to control the speed of the pump.

Of course, for customers who do not have programming capabilities or are inconvenient to control through signals, they can choose other pumps with built-in speed regulation, such as knob speed control type and voltage speed control type. In addition, our company provides TS series speed regulators that can be used with pumps to achieve speed control through the touch screen of the speed regulator.

small electronic diaphragm pump

Q: What are the differences between Hilin small electronic diaphragm pump frequency speed regulation type and the previous PWM speed regulation type?

A: PWM speed regulation uses a square wave signal to regulate the speed of the motor. The square wave frequency is fixed. By changing the square wave duty cycle, the conduction time of the internal switch circuit of the motor is changed, thereby changing the motor speed.

Frequency speed regulation is a closed-loop control speed regulation method. The signal form is also a square wave signal. The duty cycle of the square wave is fixed at 50%. The frequency range is the speed range of the corresponding motor, and the set frequency value is the corresponding speed value.

In layman’s terms, this kind of closed-loop control means that the internal processor of the small electronic diaphragm pump collects the frequency signal we set (the frequency value corresponds to the rotational speed value, for example: 700 Hz corresponds to 700 rotations of the motor), and then the processor adjusts the speed of the motor while obtaining The motor feedbacks the speed and then automatically adjusts to the speed we set. For PWM speed regulation, if you want to know the speed value corresponding to the adjusted duty cycle, you must process the motor’s speed feedback signal (FG signal) and convert it into a speed value.

The advantage of frequency speed regulation products is that they can perform closed-loop control and speed regulation through user input of frequency signals. At the same time, they can also start and stop control. For example, the C30 series frequency speed confirm type signal definition can be controlled by setting a frequency signal lower than 100 kilohertz. The small electronic diaphragm pump stops.

Q: What is the difference between knob encoder speed regulation and potentiometer speed regulation?

A: Most of the old customers who often use Hilin micro pumps have come into contact with our C09/C26/C30/D35 series of knob speed-adjustable micro pumps. The speed of the knob speed-adjustable micro pump is adjusted through a knob encoder. Rotating the knob encoder left and right can adjust the speed of the small electronic diaphragm pump, thereby affecting the output flow of the pump. At the same time, the knob encoder has a press start and stop function. Our knob speed regulating products are equipped with a knob encoder and connecting cable as standard.

Our company’s C50/C60/C61/D50/D60 series has launched voltage speed regulation products. The voltage speed-adjustable small electronic diaphragm pump can adjust the pump speed by inputting voltage signals of different sizes. This speed adjustment method can be controlled by a potentiometer, a microcontroller, a host computer such as a PLC. Our voltage speed regulating products are equipped with a knob potentiometer and connecting cable as standard. The knob potentiometer only has the knob speed adjustment function and does not have the push switch function of the knob encoder.

So, what are the differences between potentiometers and encoders, and how to distinguish them? The working principles of potentiometers and encoders are very different, and they can be easily distinguished based on their usage principles. Potentiometer: It is actually a sliding rheostat, which changes the resistance output through rotation. Because there is a resistor inside the potentiometer, the resistor has an angle limit, so the rotation angle is less than 360 degrees. Encoder: The principle is to change the pulse output through rotation. Because there are contacts inside the encoder, the pulse is changed by turning on and off, so it can rotate 360 degrees infinitely.

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