1. The resistive load should not exceed 60% of the rated current;
2. Overcurrent and load short circuit may cause permanent failure of the internal thyristor in SSR, so it is necessary to install a fuse or air switch, and a fuse can be used if the capacity is small;
3. The inductive or capacitive load can not exceed 40% of the rated current, and when controlling the inductive load, we must consider the start-up of the load, and try to choose a product with a relatively high withstand voltage, because the inductive load has the reverse peak voltage of Liu Bei;
4. Parallel varistors can be used for overvoltage protection, and built-in varistors can also be built according to the needs of users;
5. When the solid state relay is turned on, there will always be a voltage drop at both ends, which will produce Joule heating, especially when the large current is working, it will appear more as before, and when the current is 10 amperes, it is necessary to install a home heat dissipation device, such as a radiator, when the current is greater than 40 amperes, it is necessary to install fan cooling or water cooling;
Solid state relay is a combination of semiconductor devices, which has the advantages of no contact, high reliability and safe use, small electromagnetic interference and long service life, which is divided into two types: DC solid state and AC solid state.
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Siemens APT current transformer - how to see the multiple of the current transformer
1. Most of the multiple values can be seen from the nameplate attached to the instrument, which will show the style of the value/value, which can be known by dividing the previous value by dividing the back value when calculating the standard core-piercing turns. If the actual number of turns of the grommet does not conform to the standard, then the multiple should be ...
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Siemens APT Relays – Testing of Relays
(1) Measure the resistance of the contact: use the resistance of the multimeter to measure the resistance of the normally closed contact and the moving point, and the resistance value should be 0; The resistance between the normally open contact and the moving point is infinite. From this, it is possible to distinguish which is a normally closed contact and which is normally open.
(2) Coil resistance: multimeter R...
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Siemens APT Relays – Reliability of Relays
1. The influence of the environment on the reliability of the relay: the average time between failures of the relay is the highest under GB and SF, reaching 820,000h, while in the NU environment, it is only 60,000h.
2. The influence of quality grade on the reliability of relays: when the relay of A1 quality grade is selected, the flat ...
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Siemens APT limit switch - wiring method of limit switch
1. First of all, there is a general understanding of the knowledge of the limit switch, which is usually composed of a shell, an interconnection system and an operating head.
2. First of all, the limit switch should be set to the desired location, and then connected, in addition, it is necessary to figure out the meaning of different letters, such as NC for the long ...
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Siemens APT current transformer - how to choose a current transformer?
First, the principle of primary parameter selection of current transformer
The rated primary current of the current transformer is determined by the actual load of the tested circuit, and the rated primary current of the current transformer should not be less than the rated primary current of the circuit.
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Siemens APT Relays – an introduction to the new type of relay
The new relay refers to the electromagnetic relay developed and produced in order to meet the special requirements of the new and meet the use of special environmental conditions, its main characteristics are small size, light weight, vibration resistance, shock resistance, load range from low level load to 5A, 28 V rated load, product ...
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Siemens APT Relays – Common Causes of Failure of Solid State Relays
1. The reason for the frequent disconnection of the coil: whether the solid state relay is cleaned with ultrasonic, whether the coil is overvoltaged, etc., will cause the coil to be disconnected.
2. The reason for the insufficient power supply of the coil: First, it is necessary to confirm the voltage of the solid state relay coil. If the voltage supplied to the coil is lower than ...
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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 Limit Switches - Introduction to the types and characteristics of limit switches
Conventional domestic travel switch
LX19-001/111 in the LX19 series, LXK3-20S/T in the LXK3 series, JLXK1 series JLXK1-111/411/511 in the conventional travel switch are the most representative.
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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 – the solution to common faults in solid state relays
1. The simplest and most effective way is to use a new solid state relay.
2. The other is to determine the voltage of the coil to avoid the voltage provided by the coil being less than the operating voltage.
3. Check whether the polarity is reversed.
4. Reasonable power-on time for the solid state relay coil, if ...
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Siemens APT - LW39 series 10,000 revolutions FAQ
1. What are the current specifications of universal transfer switches?
At present, there are four forms: 10A, 16A, 25A, and 63A
2. What are the positioning angles of the universal transfer switch?
At present, it is divided into four angles: 30°, 45°, 60° and 90°
3. There is no customer's ...
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What are the main problems with Siemens APT Relays – Solid State Relays?
When the solid state relay is open and there is voltage at the load end, there will be a certain leakage current at the output end, and care should be taken to prevent electric shock when using or designing. When the solid-state relay fails to be replaced, the original model or the product with the same technical parameters should be selected as far as possible, so as to match the original application line and ensure that the system ...
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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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Siemens APT Relays – Classified by relay load
(1) Micro-power relay: when the contact open circuit voltage is DC 28V, the (resistivity) is 0.1A, 0.2A relay.
(2) Weak power relay: when the contact open circuit voltage is DC 28V, (resistivity) is 0.5A, 1A relay.
(3) Medium power relay ...
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Siemens APT current transformers – measures to reduce errors
The excitation current is the main cause of the error of the current transformer, so reducing the excitation current can reduce the error
(1) The core is made of materials with high permeability, because the magnetic properties of the core not only affect the ratio difference and angular difference, but also affect the saturation multiple.
(2) Increase the cross-section of the iron core and shorten the magnetic circuit.
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Siemens APT - ALH-0.66 series transformer FAQ
1. What is the maximum voltage that can be used for an ALH transformer?
AC low voltage up to 720V
2. Is there a protective grade product for ALH transformers?
II-P AND III-P are available in both protective grades
3. What is the maximum primary current of ALH transformer?
The maximum primary side current is 8 ...
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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 LA39 series button FAQ
1. What are the installation methods of LA39-A/B/C button?
There are five types in total: the Z1 diagonal screw unit, the Z2 straight screw unit, the Z3 nut device with fastening screws, the Z4 nut device without fastening screws, and the Z5 quick and convenient one-handed device
2. LA39 series products can be used ...
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Siemens APT Relays - Selection Method for Solid State Relays
1. When selecting the solid-state relay used in the printed circuit board with small current specifications, because the lead terminal is made of high thermal conductivity material, the soldering should be carried out under the condition that the temperature is less than 250 °C and the time is less than 10S.
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