Precautions for starting electrical equipment after a long holiday - Senlan

How to choose the speed control form of the general inverter: the general inverter is also known as the high-performance inverter, the PG-free vector inverter, and the torque control inverter, why? Originally, the main speed control form is different, so how to choose the speed control form of the inverter? ...

For the most popular electrical control equipment inverter (Variable-frequency Drive, VFD), as a precision electronic industrial control equipment, in order to run smoothly for a long time, we, as professional and technical personnel, need to be on the VFD device or before the operation.

1. The shield wire should be as close as possible to the low potential end, which can be understood in this way, generally we think that the ground potential is "0", and in reality, if there are two grounding terminals, there will be a potential difference between the two grounding terminals at a certain time, and there will be a current between the two wires, which is also a kind of agitation.

Natural heat dissipation methods are generally used for heat dissipation of small-capacity inverters, because their operating environment should be well ventilated and free of dust and floating objects. The drag targets of such inverters are mostly household air conditioners, CNC machine tools, etc., and the power is small. Still...

Recently, the "General Contracting Project of Boiler Feed Pump Frequency Conversion Technology Transformation Project of Yili Power Plant of Guoshen Group" undertaken by Hope Sunland has been successfully implemented and connected to the grid, adding another classic to the comprehensive application of Sunland's high-power boiler feed pump. In 2020 ...

1. Please explain the maintenance function of the inverter? (1) After detecting the abnormal situation, the correction action will be carried out automatically, such as overcurrent loss rate prevention, regeneration overvoltage stall prevention. (2) After detecting the abnormality, the PWM control signal of the power semiconductor device is closed, so that the motor can park automatically. As...

Dynamic "fast response" DC motors are rectified constrained and excessively high di/dt is not allowed. The asynchronous motor is only constrained by the capacity of the inverter, and the multiple of the forced current can be very high, so the speed echoes quickly, generally reaching the millisecond level, which has surpassed the DC motor in terms of speed. At low frequencies ...

It is necessary to separate the signal line from the power line: when using analog signals for long-distance control of the inverter, in order to reduce the disturbance of the analog amount from the inverter and other equipment, please separate the signal line of the control inverter from the strong current circuit (main circuit and sequential control circuit). Inverter ...

1. The contact screen all-in-one machine adopts the new contact identification technology, and the user only needs to touch it lightly on the contact screen without passing the pressure sensing to complete the operation. Care must be taken not to use too much force or sharps to scratch the surface of the contact screen. ...

1. Wiring of fire emergency lighting Generally, the flame retardant wire is used to wear the metal pipe and the thickness of the protective layer is ≥ 30mm, in the decoration project, when the emergency lighting circuit can only be applied to the ceiling, the heat-resistant or fire-resistant wire should be selected and the fire-resistant and heat-resistant matching should be considered.

There are many control methods for inverters for fans and pumps, which can be selected according to specific conditions. Here are a few common scenarios. (1) Manual adjustment This is the simplest control method, that is, the operator instructs according to the instrument, ...

The first step is not to turn on electricity! First open the inverter panel, wipe the inverter dry, and then use a hair dryer to dry the display, PC board, push board, power components, fans, etc., with 95% alcohol, scrub the components with 95% alcohol, and dry the hair dryer with cold air. Step 2: After an hour, use alcohol ...

Prior to the introduction of frequency converters, overhead crane operators operated the cranes using contactor-based controls. For low-cycle cranes, the system is equipped with a single or two-speed motor. For cranes with higher load cycles, they use so-called wound rotor motors. ...

The wearing parts of the driver mainly include electrolytic capacitors for filtering and cooling fans, and their service life is closely related to the environment and maintenance of the operation. Depending on the operating moment, the user can determine whether a wear part needs to be replaced. Cooling ...

Investigation of the function of the inverter system Before debugging the inverter, it is necessary to carefully read the instruction manual and related information of the inverter to be debugged to understand the use environment and precautions. Especially before the inverter is energized, it is necessary to carefully investigate and check whether the inverter has obvious problems.

Before the asynchronous motor is equipped with an inverter, let's take a look at the three major types of mechanical equipment loads: 1. Constant torque load: such as conveyor belt and mixer; When the inverter drags the load of constant torque nature, the torque at low speed should be large enough, and the overload should be large enough. If you need ...

1. How to distinguish between heavy faults and light faults According to the occurrence time of inverter faults, we can divide the types of faults into two categories: sudden faults and intermittent faults: (1) The sudden fault of inverter repair refers to the failure of the equipment when it is running, without warning.

What is an inverter power supply? A variable frequency power supply converts the alternating current from the main power supply from AC→DC→AC to a pure sine wave. The output frequency and voltage can be adjusted within a specific range. Unlike the inverter governor used for the speed control of electric motors, it is also different from the general AC power supply. Aspiring AC ...

Due to the heavy rain and humidity in some areas recently, in order to avoid long-term power failure and the impact of wetting on the inverter, the following points can be used as various precautions before customers resume production: 1. Look inside the electrical cabinet, e.g. ...

Generally speaking, the inverter will inevitably present some problems during operation, such as oscillation and noise, which are common problems in VFD operations. So, what causes oscillation and noise in VFDs? What is the solution to these problems? Here are the causes of VFD oscillation and noise ...