01 The role is different
Proximity switches are contactless switches with a long life and are suitable for "pass-through signals". The travel switch is also known as the limit switch, the travel switch and the limit switch are both position switches, but the travel switch can detect the stroke and can be used as an input signal to control the circuit at a certain distance. Different from the limit switch, it detects the signal of the restricted position, and plays the role of stopping and protecting.
02 Different triggers
Travel switch. When the animal approaches a still life, the connecting rod of the switch drives the contact of the switch, causing the closed contact to break or the disconnected contact to close. The action of the circuit and mechanism is controlled by the change of the opening and closing state of the switch contact. An inductive proximity switch is a position sensor with a switching output, which consists of an LC high-frequency oscillator and an amplification processing circuit, which uses a metal object to produce eddy currents inside the object when it approaches the oscillation sensing head that can generate an electromagnetic field. This eddy current reacts on the proximity switch, which attenuates the oscillation ability of the proximity switch and changes the parameters of the internal circuit, thereby identifying whether there is a metallic object approaching, and then controlling the switch on or off.
03 The installation object is different
The travel switch, also known as the limit switch, can be installed on relatively stationary objects (such as fixed frames, door frames, etc., referred to as still life) or moving objects (such as cars, doors, etc., referred to as animals). The proximity switch consists of an LC high-frequency oscillator and an amplification processing circuit that uses a metal object to generate eddy currents inside the object when it approaches the oscillation sensing head, which generates an electromagnetic field.
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Siemens APT Relays - What are the relays that burn out?
1. The position of the auxiliary contact is not suitable.
After the switch has been tripped, the mechanical part has moved, worn phenomenon, resulting in the auxiliary contact position offset to the correct position, in the protection action tripping, when the auxiliary contact is not disconnected, the outlet electrical appliances, electrical appliances, relays have returned, and it is ...
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Siemens APT relay - common faults and solutions for high-voltage relays
1. Poor contact
Poor contact is one of the most common faults in high-voltage relays, which can lead to problems such as hot terminals ® and burned contacts. Workarounds include regularly checking terminals and set screws for loose and cleaning contact surfaces.
2. Excessive wear
At...
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Siemens APT new x. The new product of R series relay was released
On May 8, 2019, APT held a grand online conference in Shanghai, Beijing, Guangzhou, Nanjing, Changsha and Tiantai...... and more than 20 cities across the country witnessed the new Siemens APT x. The new product of R series relay was released.
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Siemens APT Relays – The action of high and low voltage relays and how to adjust the low voltage side
1. Disconnect the control power supply: Before making the low-voltage terminal contact adjustment, the control power supply should be disconnected first to avoid the current directly or indirectly passing through the relay contact, and avoid electric shock or damage to the relay.
2. Open the relay cover: Open the relay cover, you can see the inside of the relay.
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Siemens APT transformer – common faults and analysis of voltage transformers
(1) The insulation between the iron chips is damaged
Problem: The temperature rises during operation.
Possible causes of the problem:
(1) Poor insulation between iron chips
(2) The use of harsh environmental conditions or long-term operation at high temperature to promote the aging of insulation between iron chips.
（ ...
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Siemens APT - AD16 series indicator frequently asked questions
1. Why does the indicator light still glow after the control power supply has been disconnected?
This situation is caused by the presence of interference voltage, and this problem can be solved by ordering our anti-interference indicator light
2. What are the operating hours of the AD16 series indicators?
More than 30000 small ...
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Siemens APT Relays - Maintenance Methods for Solid State Relays
1. The influence of the ambient temperature
The load capacity of the solid state relay is greatly affected by the ambient temperature and its own temperature rise, during the use of the device, it should be ensured that it has good heat dissipation conditions, the rated working current of more than 10A products should be equipped with radiators, and the products above 100A should be dissipated.
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Siemens APT current transformer - introduction to the classification of current transformers
Categorized by use
According to different uses, current transformers can be roughly divided into two categories:
Current transformer for measurement (or measurement winding of current transformer): provides current information of the power grid to measurement, metering and other devices within the normal working current range.
Protecting Electricity ...
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Siemens APT Relays – How to Choose the Right Power Relay
1. Measure the resistance of the contact
Use the resistance level of the universal meter to measure the resistance of the normally closed contact and the moving point, and its resistance value should be 0, (the contact resistance value can be measured in a more accurate way within 100 milliohms); The resistance between the normally open contact and the moving point is infinite. From this, it can be distinguished which is a normally closed contact ...
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Siemens APT Relays - the main product technical parameters of relays
(1) Rated working voltage: refers to the voltage required by the coil when the relay is working normally. Depending on the type of relay, it can be either AC voltage or DC voltage.
(2) DC resistance: refers to the DC resistance of the coil in the relay, which can be measured by a multimeter.
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Siemens APT relay - the cause and solution of the fault of the high-voltage relay
1. Some common faults of high-voltage relay coils
1. The common fault cause of the coil is often disconnected: whether the ultrasonic wave is used to clean the high-voltage relay, or whether the overvoltage is added to the coil will also promote the probability of the coil being disconnected.
2 ...
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Siemens APT PB3 series of quick-fit pushbuttons wins CAIMRS "Automation Innovation Award"
On August 26, the CAIMRS2022 China Automation + Digital Industry Annual Conference was held in Beijing. Based on the fields of automation, digitalization, industrial robotics and industrial interconnection, this conference shared top digital innovation ideas, discussed the latest trends in the industry, and how to grasp the new round of science and technology.
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Siemens APT Relays - Installation Precautions for High and Low Voltage Relays
1. Choose the right relay: When choosing a high and low voltage relay, you should choose the right product according to your needs, such as selecting according to the rated voltage, current and other information
2. Installation location: high and low voltage relays should be installed in dry, ventilated, non-corrosive gas, less dusty areas, ...
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Introduction to the features of Siemens APT DY2 miniature relay
Various specifications, with indicator light, with manual test button, with surge suppression loop and other functions
Coil control voltage DC6V-220V, AC6V-240V(50/60HZ)
The rail type is equipped with a variety of adapting sockets
LED indicator, DC is green, AC is red
Illuminating...
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Siemens APT current transformer – wiring method of current transformer
1. The single wiring mode can only feedback the status of single-phase current.
2. Three-phase complete star wiring, usually used in transformer differential protection wiring.
3. The two-phase incomplete star wiring method is used frequently in daily work.
4. The two phases ...
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Siemens APT current transformer - working principle and characteristics of current transformer
How a current transformer works
The principle of current transformer is based on the principle of electromagnetic induction. A current transformer is composed of a closed core and windings. It has a small number of turns on the primary side winding, stringed in the line where the current needs to be measured, so it often has the full current of the line ...
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Siemens APT warning light - the role of LED warning light in life
LED warning light function
1. The luminous method selection items are: solid light, shiny, burst flash, constant/shiny mix.
2. The installation base is: L rod, straight rod, folding, and barrel type.
Effect of LED warning light_Effect in different scenes
1. Construction unit
On the road ...
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Introduction to the advantages and disadvantages of Siemens APT relays - solid state relays
merit
1. High life, high reliability: solid state relay has no mechanical parts, the contact function is completed by solid devices, because there are no moving parts, so it can work in a high impact and vibration environment.
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Siemens APT transformer - the use, principle and selection of current transformer
The principle of the current transformer is based on the principle of electromagnetic induction. A current transformer is composed of a closed core and windings. Its primary side winding turns are very small, string in the line of the current that needs to be measured, so it often has all the current of the line flowing through, the number of turns of the secondary side winding is relatively large, and the series ...
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Siemens APT Relays – Classified by relay form factor
(1) Miniature relay: the longest side of the relay is not more than 10 mm.
(2) Ultra-miniature relay: the longest side size is greater than 10 mm, but not more than 25 mm.
(3) Small miniature relay: the longest side size is greater than 25 mm, but not large...
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