H+L Harley valve

H+L Harley valve

H+LHarley solenoid valve WE01-4R100Z24/OH+RVW-4P2T1MZ300

Hartmann&Lammle, German H+L, VOITH Harley solenoid valve, switch, overflow valve, pressure reducing valve, shock absorber, control valve

Hartmann&Lammle, a German company, offers a complete range of hydraulic control systems and various industrial control valves and accessories. The hydraulic products innovatively developed by H+L in Germany have been recognized by industry professionals for their stable technology and performance. German H+L Harley products: solenoid valves, switches, relief valves, pressure reducing valves, shock absorbers, control valves

H+L Harley valve

German H+L solenoid valve THL.7650210

German H+L solenoid valve THL.7650210

German H+L solenoid valve THL.803217210

German H+L solenoid valve THL.803217210

German H+L solenoid valve THL.8016100810

German H+L solenoid valve THL.8016100810

German H+L solenoid valve THL.9102010010

German H+L solenoid valve THL.9102010010

German H+L solenoid valve WE02-6P

German H+L solenoid valve WE02-6P

German H+L solenoid valve WE02-10H1547-4LR24/OH

German H+L solenoid valve WE02-10H1547-4LR24/OH

German H+L solenoid valve WE09-4L1426-Z024/OH

German H+L solenoid valve WE09-4L1426-Z024/OH

German H+L solenoid valve WE15-4P100E24/0H

German H+L solenoid valve WE15-4P100E24/0H

German H+L directional valve DZ52-120Z300R024/0H

German H+L directional valve DZ52-120Z300R024/0H

German H+L directional valve DZ52-120Z300R220/5H

German H+L directional valve DZ52-120Z300R220/5H

German H+L directional valve DZ52-120Z300Z024/0H

German H+L directional valve DZ52-120Z300Z024/0H

German H+L directional valve DZ52-120Z300Z220/5H

German H+L directional valve DZ52-120Z300Z220/5H

Shandong Sailite's main products include various sensors, hydraulic and pneumatic components, optical detection equipment, analytical instruments, experimental equipment, electrical equipment and components, brake transmission components, machines, tools, etc.

Industrial Knowledge

Precautions for hanging signs and installing barriers:

1. 'Do not close, someone is working' - switch or isolation switch handle;

2. 'Grounded' - hung on the grounded switchgear door inside the cabinet;

3. 'Do not close, there are people working on the line' - on the switch or knife switch handle of the switchgear that is being inspected on the substation line

4. 'Stop, high voltage danger' - working on high voltage equipment, on the fence of live equipment on both sides - climbing up and down the ladder

5. The hanging and removal of signs should be carried out in accordance with the overall command or work order regulations, and it is strictly prohibited for staff to move or remove barriers and warning signs during work.

Precautions during power outage:

1. Firstly, separate the switches of all outgoing loads on the busbar that has lost power, so that there is no or less load during the power reversal process, in order to avoid the impact causing the backup power to trip, resulting in a larger power outage or important loads on the backup power to trip;

Step by step power transmission and prioritize important loads for power transmission;

3. There is someone to supervise and ensure the safety of the overturned electricity;

4. Prepare emergency lights with sufficient power for backup;

5. Avoid contact lines that cannot be connected in parallel during power reversal.

Working principle of frequency converter

A frequency converter is a device that converts a power supply (50Hz or 60Hz) into AC power of various frequencies to achieve variable speed operation of a motor. The control circuit controls the main circuit, the rectifier circuit converts AC power into DC power, the DC intermediate circuit smooths and filters the output of the rectifier circuit, and the inverter circuit converts DC power back into AC power. For inverters such as vector control inverters that require a large amount of computation, sometimes a CPU for torque calculation and some corresponding circuits are also needed. Variable frequency speed regulation is achieved by changing the frequency of power supply to the stator winding of a motor.

Composition of frequency converter

main circuit

The main circuit is the power conversion part that provides voltage and frequency regulation power to asynchronous motors. The main circuit of a frequency converter can be roughly divided into two categories: voltage type is a frequency converter that converts the DC voltage source into AC, and the filtering of the DC circuit is a capacitor. Current type is a frequency converter that converts the DC of a current source into AC, and its DC circuit filter is an inductor. It consists of three parts: a "rectifier" that converts power frequency into DC power, a "smoothing circuit" that absorbs voltage pulsations generated by converters and inverters, and an "inverter" that converts DC power into AC power.

rectifier

The widely used converter is a diode converter, which converts the power frequency power supply into a DC power supply. Two sets of transistor inverters can also be used to form a reversible inverter, which can perform regenerative operation due to its reversible power direction.

Flat wave circuit

In the DC voltage rectified by the rectifier, there is a pulsating voltage with a frequency six times that of the power supply. In addition, the pulsating current generated by the inverter also causes fluctuations in the DC voltage. To suppress voltage fluctuations, inductors and capacitors are used to absorb pulsating voltage (current). When the device capacity is small, if there is excess capacity in the components of the power supply and main circuit, a simple smoothing circuit can be used instead of an inductor.

inverter

Unlike rectifiers, inverters convert DC power into AC power of the required frequency, and by turning on and off six switching devices at a predetermined time, a 3-phase AC output can be obtained. Using a voltage type PWM inverter as an example, illustrate the switching time and voltage waveform.

The control circuit is a circuit that provides control signals to the main circuit that supplies power (voltage and frequency adjustable) to asynchronous motors. It has a frequency and voltage "calculation circuit", a main circuit "voltage and current detection circuit", and a motor "speed detection circuit", which amplifies the control signals of the calculation circuit