Maintenance method:
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.
2. The selection of SSR for solid state relay with various load surge characteristics
The controlled load will generate a large inrush current at the moment of switching, and because the heat cannot be dissipated in time, it is likely to damage the internal thyristor of the SSR, so the user should analyze the surge characteristics of the controlled load when selecting the relay, and then select the relay. To make the relay be able to withstand this inrush current under the premise of ensuring steady-state operation, you can refer to the derating coefficient (at room temperature) of various loads in Table 2 when selecting.
If the selected relay needs to work in the occasion with high requirements for more frequent work, life and reliability, it should be multiplied by 0.6 on the basis of Table 2 to ensure reliable operation.
Generally, the above principles are followed in the selection, and the DC solid-state relay using the FET as the output device can be selected when the signal distortion is small at low voltage; For example, for AC resistive loads and most inductive loads, zero-crossing relays can be selected, which can prolong the life of the load and relay, and also reduce its own radio frequency interference. If it is used as a phase output control, a random solid state relay should be selected.
3. The influence of the ambient temperature of use
The load capacity of the solid state relay is greatly affected by the ambient temperature and its own temperature rise, in the process of installation and use, 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 equipped with radiators and fans for strong cooling. During installation, attention should be paid to the good contact between the bottom of the relay and the heat sink, and consider applying an appropriate amount of thermal grease to achieve heat dissipation.
If the relay works at high temperature for a long time (40°C-80°C), the user can consider derating to ensure normal operation according to the large output current and ambient temperature curve data provided by the manufacturer.
4. Over-current and over-voltage protection measures
When the relay is used, the internal output of the SSR solid state relay will be damaged due to overcurrent and load short circuit, and the fast fuse and air switch can be considered in the control loop for protection (the product output protection should be selected for the selection of relay, with built-in varistor absorption loop and RC buffer, which can absorb surge voltage and improve dv/dt resistance); Output protection can also be achieved by connecting an RC absorption loop and a varistor (MOV) at the output end of the relay. The selection principle is 500V-600V varistor for 220V, and 800V-900V varistor for 380V.
5. Relay input loop signal
When the input voltage is too high or the input current is too large to exceed the rated parameters specified in the input, it can be considered to connect the voltage divider resistor in series at the input terminal or connect the shunt resistor at the input port in parallel, so that the input signal does not exceed its rated parameter value.
6. In specific use, the control signal and load power supply are required to be stable, and the fluctuation should not be greater than 10%, otherwise voltage stabilization measures should be taken.
7. When installing and using, it should be kept away from electromagnetic interference and radio frequency interference sources to prevent the relay from malfunctioning out of control.
8. 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, which should be paid attention to when using or designing.
9. 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 to match the original application line and ensure the reliable operation of the system.
|
More on that
|
Selection and features of Pilz safety relays
Selection and features of Pilz safety relays:
1. Understand the necessary conditions first
The power supply voltage of the control circuit, the maximum current that can be delivered;
voltage and current in the controlled circuit;
How many sets of contacts and what form of contacts are required for the controlled circuit.
Choosing the following ...
|
|
Pilz was invited to attend the China Equipment Manufacturing Industry Youth Safety Expert Forum
Recently, the inaugural meeting of the Youth Safety Expert Working Committee of China Machinery Industry Safety and Health Association and the first China Equipment Manufacturing Youth Safety Expert Forum were held in Chengdu, Sichuan.
|
|
Pilz - Presentation of the features of the safety relay PNOZ s60
In addition to the usual emergency stop monitoring, safety gate monitoring, light barrier monitoring and two-hand button monitoring, the safety relays of the PNOZsigma family are also functional, as well as safe speed monitoring, safe braking and braking monitoring. Voltage monitoring safety relays are also one of its features.
PNO ...
|
|
Pilz: New system version PSS 4000 1.24
The automation system PSS 4000 offers new features in the new version 1.24. Here's what you need to know:
New data types FIXED and LFIXED
The data types FIXED (a fixed digit with 6 decimal places) and LFIXED (a fixed number with 11 decimal places) are now ...
|
|
Pilz – how safety light curtains are safe to install
1. The installation of the safety grating must be able to effectively prevent bypassing the detection area of the safety grating and contacting the dangerous moving parts, that is to say, the detection area of the installation grating can not have a blind spot, if the top or bottom of the safety grating has a fixed guard, the guard should be able to ...
|
|
Peel magnetic relay - the application and current situation analysis of solid state relays
Applications for Solid State Relays
(1) The recommended value of the foreign SSR trigger signal (i.e., the current through the light-emitting tube) is 10mA DC, and the recommended value of the domestic SSR trigger signal is 12-25mA DC.
(2) Multiple SSRs can use the same trigger signal, which is common in the control of three-phase AC loads.
|
|
Peel magnetic relay - the wiring method, function and application of time relay
Wiring method of time relay
1. Control wiring
You think of it as a DC relay. 3. 7 is used to connect to 12V control voltage; 2. 7 is used to connect to 24V control voltage. 7 of them are used as the negative electrode of direct current, which is connected to the neutral line when used. 2. Connect to a 220V live wire.
2 ...
|
|
Requirements for safety circuits for Pilz safety relays
1. When the emergency stop is lifted, the machine cannot be suddenly restarted
2. In case of failure of the machine safety circuit, the power supply of the machine can be stopped
3. When the safety circuit fails, the machine can no longer be started
Confirm safe input such as safety switches, light curtains, etc.
|
|
Requirements for Pilz to fix safety switches
Safety doors are mainly used to prevent the operation of the machine under certain conditions (usually when the guard is not closed) in order to avoid the occurrence of danger as much as possible. If the safety gate switch itself is not installed in compliance, resulting in its interlocking function not being implemented correctly, "it is time to do nothing", obviously ...
|
|
Pierz safety light curtains – what are the components of a safety light curtain?
Luminaire: emits infrared light and is composed of a plurality of light-emitting devices;
Light receiver: Receiving infrared light, composed of a number of light receiving devices, one by one corresponding to the light emitting device of the luminaire, forming a protective light curtain, generating shading, light signal, and at the same time transmitting the signal through the signal cable to control...
|
|
Pilz: Don't underestimate the authorization key, it can make a big difference!
With the increasing functional requirements of industrial production, the continuous optimization of process levels and the escalation of the complexity of production conditions, systems that effectively record and manage relevant data are particularly important for machine safety, especially for production safety.
PITreader Authorization ...
|
|
Pilz: Become a certified expert in industrial security
Industrial security has become an integral part of automation, but with new requirements and specifications, manufacturers, integrators, and operators are faced with the question of how their employees can meet the new challenges. In response, Pilz has launched a new safety training course that can help students learn ...
|
|
Pilz Safety Burner Management System
An autonomously running burner management system has a complex structure and must comply with many international standards. Due to the high level of danger, strict safety regulations need to be applied to avoid the presence of unburned fuel in the combustion chamber. Pilz has a safe burner management system specifically tailored to these requirements.
...
|
|
Pilmagnetic switches – what are the requirements for a fixed safety switch?
1. The fastener itself needs to be reliable and stable enough.
2. Need to rely on special tools to remove, such as hexagon screws, star screws, etc. Phillips/slotted screws are not recommended, as in some cases they can be easily fitted with fingernails or on the go.
|
|
Peel magnetic relay - the selection principle of electromagnetic relays
1. Selection of relay coil application power supply
Under normal circumstances, most of the relays of direct current are selected in the circuit design, and the types of power supplies used in relays can also be considered according to the characteristics of the control circuit. Secondly, it is necessary to think about the power consumed by the relay, and assume that the relay coil is supplied ...
|
|
Peel magnetic relays - analysis of common faults and causes of relays
1. Contact failure
(1) The phenomenon that cannot be disconnected due to mechanical occlusion of the contact (the needle-like protrusion and pit formed on the contact bite each other), fusion welding, or cold welding.
(2) The contact wear of the relay is caused by the absence of arc extinguishing devices or measures, or improper parameter selection, ...
|
|
Pilz: The first products with IO-Link Safety will soon be available on the market
IO-Link is an open sensor communication protocol that represents a powerful and standardized (IEC 61131-9) connection technology in the field of point-to-point communication and is fieldbus and system independent. The communication protocol will also be used for functionally safe data exchange in the near future.
The advantages of IO-Link are ...
|
|
Common faults with Pilz safety relays
The most common ones are the following:
(1) Contact failure
1. The phenomenon that cannot be disconnected due to mechanical occlusion of the contact (the needle-like protrusion formed on the contact and the pit biting each other), fusion welding, or cold welding.
2. Due to the contact resistance becoming larger and unstable, the circuit cannot ...
|
|
Peel magnetic relays – the characteristics and working principle of relays
When the input quantity (such as voltage, current, temperature, etc.) reaches the specified value, the electrical appliances that make the output circuit to be controlled on or off can be divided into two categories: electrical quantity (such as current, voltage, frequency, power, etc.) relays and non-electric (such as temperature, pressure, speed, etc.) relays.
|
|
Pilz: Bake delicious wafers safely
Franz Haas, the founder of the Bühler Group, invented the first wafer machine as early as the end of the 40s of the 20th century. Today, its subsidiaries are spread all over the world. In the wafer area of the consumer food division in Leobendorf, 700 employees are engaged in development, design and production, as well as sales, service, maintenance ...
|
|
Contact
working hours
