不忘初心软启动器3RW40381BB04

西门子电动启动器，保护断路器，塑壳式断路器以下部分型号：
三相异步电动机的起动方式
1，直接起动。但三相异步电动机直接起动时电流可达到额定电流的6-7倍，对电网的冲击较大，特别是大功率电动机。
2，降压起动。降压起动主要有热自藕降压起动和星三角降压起动。
热自藕降压起动是指通过自藕变压器在起动时降低电机电压，同时降低起动电流。一般降低为额定电压的55%-75%左右。优点是可以通过改变自藕变压器的抽头圈数方便地改变起动电压。缺点是需要用到自藕变压器，成本较大。
星三角降压起动是指通过改变电机的接线方式而改变起动电压，从而降低起动电流的一种方法，只能适用于正常接线方式为三角形接法的电机。在起动时，使用继电器方法使电机接线方式为星形，此时电机的每相电压降低为原来的根号三分之一，电机转速达到额定转速的80%左右，控制继电器改变电机接线方式为三角形，电机开始正常运转。优点是可以节省自藕变压器，降低成本，同时接线方法简单，可靠性较大。缺点是无法改变起动电压的比率，同时无法使用在星形接法的电机。
3，频敏电阻起动。频敏电阻起动是指在电机起动时在主路中串联频敏电阻，从而降低起动电流。频敏电阻能够平滑地改变起动电流，对电网的冲击较小，是较为理想的起动方式。但是大功率的频敏电阻都是采用电感的形式，所以在使用时会产生较大的电磁涡流，会降低电网的功率因数。
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另有ABPLC全系列产品优势供应：
1756 ControlLogix Digital I/O Modules
Offers a variety of voltages
Provides 8 to 32 points per module
Offers isolated and non-isolated module types
Includes point-level output fault states
Offers direct-connect or rack-optimized communication
Offers field-side diagnostics on select modules
1756 ControlLogix Analog I/O Modules
Includes input, output, and combination modules
Provides thermocouple and RTD modules
Includes on-board data alarming
Offers scaling to engineering units
Provides real-time channel sampling
Offers electronic module keying, and is software configurable
Includes mechanical RTB keying, user-defined
Offers per channel configuration for voltage, current or 2-wire transmitter current sourcing
Offers Per channel configuration for either RTD or Thermocouple
As of March 31, 2017, the ControlLogix 1756 Isolated Analog I/O 6-channel modules will be discontinued and no longer available for sale. Customers are encouraged to migrate to the 1756 Isolated Analog I/O 8-channel modules using the Migrating 6-channel to 8-channel 1756 Analog Modules Migration Guide
1756 ControlLogix Specialty I/O Modules
Includes configurable flow meter modules
Provides high-speed counter modules
Offers programmable limit switch modules
1756 ControlLogix Removable Terminal Blocks (RTBs)
Provides a flexible interconnection between plant wiring and I/O modules
Includes screw-clamp or spring-clamp terminations
Not shipped with I/O modules; you must order separately
1756 HART Analog Isolated I/O Modules
Includes channel-to-channel isolation
Offers HART modem per channel for faster HART data update
Offers basic field device configuration via the Add-on Profile
Helps eliminate the need for field isolating barriers when using isolated modules
Offers 8- or 16-channel density modules
1756 Enhanced Analog I/O Modules
Offers increased accuracy, repeatability, stability, and precision
Includes isolated 8-channel and non-isolated 12- and 16-channel modules with stability over the entire temperature operating range
Does not require field calibration
Offers advanced precision using 24-bit design
Includes per channel status and fault LED annunciation
Offers SIL 1, systematic capability 2, type certified for use in a ControlLogix SIL 2 architecture
Offers an emulation mode that helps enable customers to migrate from 6-channel applications
1756 Communications Modules
Implements network-based access control for users, devices, and networks in the 1756 chassis
Offers security modules to encrypt important information shared between controllers and servers to prevent tampering
In-Cabinet (IP20) distributed I/O can be placed throughout your application and requires an enclosure. Our In-Cabinet Block I/O products provide a complete assembly of sensor and actuator interface points, and include a network adapter. Expansion blocks are available for some families. Choose from a wide range of analog, digital, and specialty I/O, as well as I/O for safety systems.
  1794 FLEX I/O modules offer flexibility for your application with digital, analog, HART analog, and specialty I/O, with 4…32 points per module. You can mix and match digital and analog I/O with mounting and wiring options.
1794-1734-In-Cabinet (IP20) distributed I/O can be placed throughout your application and requires an enclosure. Our In-Cabinet Modular I/O products let you select the exact mix of I/O interfaces and communication adapters to fit your needs, providing greater flexibility in designing your system. In addition to a wide range of analog, digital, and specialty modules, we provide in-cabinet I/O options for extreme environments, I/O for safety systems, and intrinsic safety (IS) I/O that can be distributed throughout hazardous areas.
1732-Our On-Machine Block (IP67/69K) Distributed I/O modules can be mounted directly on a machine rather than in a remote, central cabinet, which reduces wiring costs and provides easier maintenance. These products provide a complete assembly of sensor and actuator interface points, and each module includes a network adapter. Expansion blocks are available for some products. You can choose from analog, digital, and specialty I/O modules, as well as On-Machine I/O modules for safety systems.
Digital and analog modules plus a breadth of specialty modules support a wide variety of applications
Removal and Insertion Under Power (RIUP) lets you replace modules and make cable connections while the system is in operation
FLEX-I/O XT extreme environment modules are rated for -20...70 °C (-4....185 °F) and are compatible with the ControlLogix-XT extreme environment system
Conformal coated modules are available
Each I/O module requires a terminal base for connection points for I/O wiring
1794 FLEX I/O Digital Modules
Cover a wide electrical range
Densities range from 8…32 points
Isolated inputs or outputs, protected outputs, electronic fusing, or diagnostics available on some modules
1794 FLEX I/O Analog Modules
Individually configurable channels
Selectable input filters on many modules
Single-ended or differential inputs
On-board scaling
Internal calibration
Thermocouple, RTD, and HART (Highway Addressable Remote Transmitter) modules available
1794 FLEX I/O Specialty Modules
Frequency modules
Very High Speed counter module
Pulse counter modules
modules are safety-rated I/O modules designed to fit into the standard POINT I/O system, offering automation and safety functionality in a maximum density I/O solution. POINT Guard I/O communicates by using the CIP safety protocol over EtherNet/IP for GuardLogix controllers or DeviceNet for SmartGuard 600 controllers.1734 POINT I/O modules offer digital, analog, and specialty I/O, as well as POINT Guard safety-rated I/O, with one to eight points per module. You can mix standard and safety I/O in the same system. Comprehensive diagnostics and configurable features make POINT I/O easy to apply.
1738 ArmorPOINT I/O Modules
Our Bulletin 1738 ArmorPOINT I/O modules provides a wide range of input and output modules to span many applications, from high-speed digital to process control. ArmorPOINT I/O supports producer/consumer technology, which lets input information and output status to be shared among multiple Logix controllers.
Choices include digital, analog, and specialty I/O
Available with DeviceLogix technology
Densities range from two to eight points per module
Interfaces up to 63 modules for as many as 252 I/O points per network
Powered from the backplane by the communication module or expansion power supply
1738 ArmorPOINT Digital I/O Modules
Wide variety of AC and DC voltages
Input, output, and relay output modules
On configurable modules each point can be either a DC input or output
Isolated and non-isolated module types
Point-level and field-side diagnostics on select modules
Choice of direct-connect or rack-optimized communications
1738 ArmorPOINT Analog I/O Modules
Includes thermocouple and RTD modules
As many as four single-ended inputs or outputs per module
On-board, channel-level data alarming (four set-points per channel)
Scaling to engineering units
Channel-level diagnostics (electronic bits and status indicators)
1738 ArmorPOINT Specialty I/O Modules
Counter module
Synchronous Serial Interface (SSI) module
Serial interface modules (RS-232, RS-485/RS-422)