Интеллектуальный дизайн: цифровой позиционер ARCAPRO® типа 827А
Позиционер ARCAPRO® – это интеллектуальный позиционер второго поколения. Он не только предлагает широкий диапазон функций и высокую надежность, но еще и передовую диагностику системы в реальном времени, а также имеет дисплей обслуживания . Информация о положении штока посылается на потенциометр, выходной сигнал которого микропроцессор сравнивает с заданным значением. Используя специальный алгоритм управления, контроллер активирует два пьезо-датчика , которые связывают привод с атмосферой или подаваемым воздухом.
Позиционером ARCAPRO® можно управлять на месте или с пульта управления.
Спецификации
ARCAPRO® positioner type 827A
General data | Enclosure material | Anodized aluminum, stainless steel, polycarbonate |
Temperature range | –40.+80 °C | |
Steady-state deviation | Typically < 0,3% | |
Linearity error | Typically < 0,5% | |
Dead zone | Self-adjusting (typically 0.3%) or adjustable (0.1% to 10%) | |
Explosion protection | without / intrinsically safe / non-sparking / explosion-proof | |
Communication / input signal | Standard / HART | 4.20mA 2 wire connection, 0/4.20mA 3/4 wire connection |
Profibus PA | Profibus PA, profile B, version 3.02 | |
Foundation Fieldbus | H1 communication, version 2.4 | |
Binary inputs |
Switching or voltage inputs, parameterizable (e.g. «Move valve to CLOSED») |
|
Option modules | Analog module | 4.20mA position transmitter, passive |
Binary module | 2 NAMUR limit switches, 1 NAMUR fault switch, 1 binary input | |
Slot initiator module | 2 inductive NAMUR limit switches, 1 NAMUR fault switch | |
Contact module | 2 mechanical limit switches | |
Pneumatic data | Inlet air pressure | 1.4.7bar |
Continuous air consumption | < 36 Ndm3/h | |
Mounting | Linear actuators | ARCA-integrated, integrated to VDI/VDE 3847 or to IEC 534; range of stroke 3.130mm |
Quarter turn actuators | Integrated to VDI/VDE 3847 or VDI/VDE 3845; angle of rotation 30.100° |
The intelligent design: ARCAPRO® digital positioner type 827A
Functional principle ARCAPRO® is an intelligent, second-generation positioner. It not only offers a wider range of functions and higher level of reliability, but also fea-tures an advanced online diagnostics system and optional maintenance dis-play. The position of the stem is sent to a potentiometer whose output signal is then compared with the set-point by the microprocessor. Using a special control algorithm, the con-troller activates the two piezo valves, which connect the actuator with the inlet air or atmosphere.
The ARCAPRO® positioner can be operated locally or from the control room.
Optimized operating modes The ARCAPRO® positioner supports the following operating modes:
- Automatic or manual mode
- Initialization
- Parameterization
- Diagnostics
Modular design The ARCAPRO® positioner is compact and modular.
Additional modules increase your range of options:
- Analog module: Position trans-mitter for signaling the actual posi-tion as a current signal of 4…20 mA
- Binary module: Two adjustable software limit switches, fault sig-naling switch, binary input
- Slot initiator module: Two vari-able inductive limit switches, fault signaling switch
- Contact module: Two adjustable mechanical limit switches
Automatic commissioning The automatic initialization function allows you to commission the posi-tioner quickly and easily. The parame-ters can be set on the device or by means of HART, PROFIBUS or Foun-dation Fieldbus communication. The following parameters can be set:
- Setpoint direction, characteristic
- Split-range mode
- Tight closing function
- Function for position and fault signaling outputs and the binary inputs