西门子模块总代理商|阳江PLC模块代理商
西门子模块代理商|阳江PLC模块代理商
概述
Legal frameworkMachine manufacturers and manufacturing plants must ensure that their machines or plants cannot cause danger due to malfunctions in addition to the general risks of electric shock, heat or radiation.
In Europe, for example, compliance with the Machinery Directive 2006/42/EC is legally stipulated by the EU Directive on Safety and Health at Work. In order to ensure compliance with this directive, it is recommended that the corresponding harmonized European standards are applied. This triggers the "assumption of conformity" and gives manufacturers and operators the legal security in terms of compliance with both national regulations and EU directives. The machine manufacturer uses the CE marking to document the compliance with all relevant directives and regulations in the free movement of goods.
Safety-related standards西门子模块代理商|阳江PLC模块代理商Functional safety is specified in various standards. For example, EN ISO 12100 specifies standards pertaining to machine safety (risk assessment and risk reduction). IEC 61508 specifies basic re for electronic and programmable safety-related systems. EN 62061 (only applicable for electrical and electronic control systems) and EN ISO 13849‑1, which has replaced EN 954‑1, define the functional and safety-related re of safety-oriented control systems.
The above-mentioned standards define different safety re that the machine has to satisfy in accordance with the risk, frequency of a dangerous situation, probability of occurrence and the opportunities for recognizing impending danger.
EN ISO 13849‑1: Performance Level PL a ... e; Category B, 1 ... 4
EN 62061: Safety Integrity Level SIL 1 ... 3
Integrated safety functions act much faster than those of a conventional design. The safety of a machine is increased further with Safety Integrated. Furthermore, thanks to the faster method of operation, safety measures controlled by integrated safety systems are perceived as less of a hindrance by the machine operator, therefore significantly reducing the motivation to consciously bypass safety functions.
功能
The safety functions integrated in SIMATIC MICRO-DRIVE are described below.
Safety functions integrated in the SIMATIC MICRO-DRIVE drives (integrated in the failsafe variants, e.g. PDC100F)The large number of safety functions integrated in the SIMATIC MICRO-DRIVE drive system in combination with the sensors and safety control required for the safety function contribute to the implementation of highly effective, practical personnel and machine protection.
They comply with the re of the following safety categories:
PL d and Category 3 according to EN ISO 13849‑1
SIL 2 according to IEC 61508 and IEC 61800‑5‑2西门子模块代理商|阳江PLC模块代理商
The Safety Integrated functions are generally certified by independent institutes. You can obtain the corresponding test certificates and manufacturer's declarations from your Siemens contacts.
The integrated safety functions that are currently available are described below. Their functional safety satisfies the re defined in the international standard IEC 61800‑5‑2 for variable-speed drive systems.
The safety functions integrated into the SIMATIC MICRO-DRIVE drive system can be roughly divided into two categories:
- Functions for safely stopping a drive
Safe Torque Off (STO)
Safe Stop 1 (SS1)
Safely-Limited Speed (SLS)
Safely-Limited Torque (SLT 1))
Safe Speed Monitor (SSM)
1) Only for PDC100F.
Safe Torque Off (STO)西门子模块代理商|阳江PLC模块代理商The STO function is the most common and basic drive-integrated safety function. It ensures that no tor energy can continue to affect a motor and prevents unintentional start-ups.
Effect
This function is a mechanism that prevents the drive from restarting unexpectedly, in accordance with EN 60204‑1, Section 5.4. The STO function suppresses the drive pulses (corresponds to Stop Category 0 according to EN 60204‑1). The drive is reliably tor This state is monitored internally in the drive.
Application
STO has the immediate effect that the drive cannot supply any tor energy. STO can be used wherever the drive will naturally reach a standstill due to load torque or friction in a sufficiently short time or when "coasting down" of the drive will not have any relevance for safety.
STO makes it possible fo西门子模块代理商|阳江PLC模块代理商r persons to work safely when the protective door is open (restart interlock) and is used on machines/installations with moving axes, e.g. on handling or conveyor systems.
Customer benefits
Some of the advantages of the Safety Integrated Function STO over conventional safety technology with electromechanical switchgear include the elimination of separate components as well as of the work that would be required to wire and service them, i.e. no wearing parts as a result of the electronic shutdown. Because of the fast electronic switching times, the function provides a shorter reaction time than the conventional solution comprising electromechanical components. When STO is triggered, the converter remains connected to the network and can be fully diagnosed.西门子模块代理商|阳江PLC模块代理商
The SS1 function causes a motor to stop rapidly and safely and switches the motor to tor mode after coming to a standstill by activating STO.
The SS1 function can safely stop the drive in accordance with EN 60204‑1, Stop Category 1. When the SS1 function is selected, the drive brakes autonomously along a quick stop ramp and automatically activates the Safe Torque Off functions when the set safe delay time has expired.
Application西门子模块代理商|阳江PLC模块代理商
The SS1 function is used when, in the event of a safety-relevant incident, the drive must stop as as possible with a subsequent transition into the STO state (e.g. EMERGENCY STOP). It is thus used to bring large centrifugal masses to a stop as as possible for the safety of the operating personnel, or to brake motors at high speeds as as possible. Examples of typical applications are saws, grinding machine spindles, centrifuges, winders and storage and retrieval machines.
The targeted stopping of a drive by means of SS1 reduces the risk of danger, increases the productivity of a machine, and allows the safety clearances in a machine to be reduced. The principle is to bring the drive actively to a standstill, compared with just using the STO function. Complex mechanical brakes that are susceptible to wear are not normally required to brake the motor.
The SLS function monitors the drive to ensure that it does not exceed a preset speed or velocity limit.
The SLS function monitors the drive against a parameterized speed limit. Four different limit values can be selected. The speed setpoint is not influenced independently. After SLS has been selected, the higher-level control must bring the drive down below the selected speed limit within a parameterizable time. If the speed limit is exceeded, a customizable drive-integrated fault reaction occurs.
The SLS limit stage 1 can be multiplied by a factor that is transferred in 16-bit resolution via PROFIsafe. This allows an almost unlimited number of limits to be specified.
The SLS function is used if people are in the danger zone of a machine and their safety can only be guaranteed by reduced speed. Typical application cases include those in which an operator must enter the danger zone of the machine for the purposes of maintenance or setting up, such as a winder in which the material is manually threaded by the operator. To prevent injury to the operator, the roller may only spin at a safely reduced speed. SLS is often also used as part of a two-stage safety concept. While a person is in a less critical zone, the SLS function is activated, and the drives are only stopped in a smaller area with higher potential risk. SLS can be used not only for operator protection, but also for machinery protection, e.g. if a maximum speed must not be exceeded.
The SLS function can 西门子模块代理商|阳江PLC模块代理商contribute to a significant reduction in downtime, or greatly simplify or even accelerate setup. The overall effect achieved is a higher availability of the machine. Moreover, external components such as speed monitors can be omitted.
The SLT function monitors the current/torque of a motor.
Effect西门子模块代理商|阳江PLC模块代理商
The SLT function allows the torque to be reduced within a defined period of time. If the torque exceeds the SLT monitoring limit, the drive responds with a "Safe Stop". The stop responses STO or SS1 can be specified via parameters.
In the simplest case, this function is used for force limiting when opening and closing a protective door on a machine.
The SLT function avoids the use of external hardware for measuring and limiting the force and the associated wiring effort.
The SSM function warns when a drive is working below an adjustable speed limit. As long as it remains below the threshold, the function issues a safety-related signal.
If a speed value drops below a parameterized limit, a safety-related signal is generated. This can, for example, be processed in a safety controller to respond to the event by programming, depending on the situation.
With the SSM function, in the simplest case, a safety door can be unlocked if the speed drops below a non-critical level. Another typical example is that of a centrifuge that may be filled only when it is operating below a configured speed limit.
Unlike SLS, there is no drive-integrated fault reaction when the speed limit is exceeded. The safe feedback can be evaluated in a safety control unit, allowing the user to respond appropriately to the situation.
The STO safety function for SIMATIC MICRO-DRIVE can be activated via terminals, e.g. for use of a conventional safety circuit.
For standalone safety solutions for small to medium sized applications, it is fre sufficient that the various sensing components are directly hardwired to the drive.西门子模块代理商|阳江PLC模块代理商
For integrated safety solutions, the safety-relevant se are generally processed and coordinated in the fail-safe SIMATIC controller. In this case, the system components communicate via the PROFINET fieldbus. The safety functions are controlled via the safe PROFIsafe communication protocol.
The SIMATIC MICRO-DRIVE drives can be easily integrated into the plant or system topology.
PROFIsafe (only for the failsafe variants, e.g. PDC100F)SIMATIC MICRO-DRIVE drives support the PROFIsafe profile based on PROFINET.
PROFIsafe is an open communications standard that supports standard and safety-related communication over the same communication path (wired or wireless). A second, separate bus system is therefore not necessary. The telegrams that are sent are continually monitored to ensure safety-relevant communication.
Possible errors such as telegrams that have been lost, repeated or received in the incorrect sequence are avoided. This is done by consecutively numbering the telegrams in a safety-relevant fashion, monitoring their reception within a defined time and transferring an ID for transmitter and receiver of a telegram. A CRC (cyclic redundancy check) data security mechanism is also used.
The operating principle of Safety Integrated西门子模块代理商|阳江PLC模块代理商Two independent switch-off signal paths
Two independent switch-off signal paths are available. All switch-off signal paths are low active. This ensures that the system is always switched to a safe state if a component fails or in the event of cable breakage. If a fault is discovered in the switch-off signal paths, the STO or SS1 function (depending on parameter settings) is activated and a system restart inhibited.
Two-channel monitoring structure
All the main hardware and software functions for Safety Integrated are implemented in two independent monitoring channels (e.g. switch-off signal paths, data management, data comparison). A cyclic crosswise comparison of the safety-relevant data in the two monitoring channels is carried out.
The monitoring functions in each monitoring channel work on the principle that a defined state must prevail before each action is carried out and a specific acknowledgement must be made after each action. If these expectations of a monitoring channel are not fulfilled, the drive coasts to a standstill (two channel) and a西门子模块代理商|阳江PLC模块代理商
随着我国电力产业的发展，对配套产业的要求越来越高。作为电力配套产业的重要组成部分，电线电缆制造商也面临着新的需求，以满足我国电力发展的需要。未来，电线电缆公司应努力改进技术，节约原材料，开发新的环保材料。在当今市场形势下，电线消费者对家居装饰电线安全环保性能的要求越来越高，传统电线电缆的市场比例越来越低，许多厂家面对这样的市场形势，积推进转型发展，从传统电线电缆到环保电线电缆，已成为不争的事实。接下来，让我们来看看他们的特点。
环保电线电缆西门子模块代理商|阳江PLC模块代理商电线电缆
环保电线电缆不同于普通电线电缆，不仅材料和工艺不同，而且性能和质量标准与普通电线电缆非常不同。主要体现在以下几个方面：
1、阻燃阻燃：环保电线电缆的阻燃耐火性符合我国消防标准。发生电气火灾时，电线电缆不易燃烧。同时，在持续燃烧的情况下，可以保证一定时间内电控系统的正常运行，大限度地减少电线电缆燃烧后火焰的扩散。
二、电线电缆本身毒性低：环保电线电缆由于原材料的特殊性，电线电缆绝缘和外护套不含铅、镉等对人体有害的重金属，可以大限度地保证自身的健康和安全。西门子模块代理商|阳江PLC模块代理商3、电线电缆不会分解腐蚀性气体：环保电线电缆采用无污染的新型特种材料，在使用过程中不会因高温等原因产生多种有害气体，对设备仪器的危害较小，显示出环保电线电缆的环保特点。
4、无污染：环保电线电缆使用的绝缘材料和护套材料均为绿色环保材料。在保证**稳定电气性能和物理机械功能的同时，保证了电线电缆的安全性能，避免了废弃电线电缆焚烧后形成的“二次污染”。
上述就是电线电缆厂家为您介绍的有关环保电线电缆普通电线电缆的特征相比的内容，对此还有什么不了解的，欢迎前来咨询我们的网站，我们会有专 业的人员为您讲解。西门子模块代理商|阳江PLC模块代理商
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