FUJIKURA_KRE
Pressure-Feedback Electro-Pneumatic Converter
- FUJIKURA KRE is a pressure-feedback electro-pneumatic converter with RS485, RS232C, 4–20mA, or 0–10V control. The RS485 model supports up to 32 units.
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Features
- Pressure-feedback control: Output pressure is corrected through pressure feedback for more precise pneumatic control than an open-loop system.
- Excellent pressure and flow characteristics: Feedback control improves output stability while providing excellent pressure and flow performance.
- Four control methods available: RS485, RS232C, 4–20mA current input, and 0–10V voltage input models are available.
- Control up to 32 units: The KRE-8-2-R4 uses RS485 communication and allows one controller to connect to a maximum of 32 units.
- Keyboard input and digital display: Keyboard input is supported, and the display resolution is 0.001MPa for pressure setting and confirmation.
Specification
| Item | KRE-8-2-R4 | KRE-8-2-R2 | KRE-8-2-IP | KRE-8-2-EP |
|---|---|---|---|---|
| Control method | RS485 | RS232C | Current input | Voltage input |
| Input signal | RS485 communication | RS232C communication | DC 4 to 20 mA | DC 0 to 10 V |
| Keyboard input | Supported | |||
| Working fluid | Clean compressed air | |||
| Set pressure range | 0.02 to 0.82 MPa | |||
| Supply pressure range | 0.9 MPa max. and at least set pressure +0.035 MPa | |||
| Display resolution | 0.001 MPa | |||
| Linearity | 0.5 % F.S. or less | |||
| Hysteresis | 1.0 % F.S. or less | |||
| Repeatability | Within ±0.2 % F.S. | |||
| Maximum flow rate | 350 L/min (ANR) or less | |||
| Air consumption | 3.7 L/min (ANR) or less | |||
| Operating temperature range | 5 to 50℃ | |||
| Pipe port | Rc1/4 | |||
| Power-supply voltage | 24±10% VDC | |||
| Current consumption | 100 mADCor less | |||
| Mounting bracket | Standard equipment | |||
| Dimensions | 104 (H) ×75.5 (L) ×102 (W) mm | |||
| Weight | 0.94 kg | |||
FAQ
Q1: What is the FUJIKURA KRE Series?
A: The KRE Series is a pressure-feedback precision electro-pneumatic converter that controls output air pressure through digital communication, current, or voltage input.
Q2: How is the KRE Series different from the RT Series?
A: The RT Series uses open-loop control, while the KRE Series adds pressure feedback for higher pressure-control accuracy and stability.
Q3: What standard models are available?
A: Standard models include KRE-8-2-R4, KRE-8-2-R2, KRE-8-2-IP, and KRE-8-2-EP.
Q4: What control methods are available?
A: R4 uses RS485, R2 uses RS232C, IP is the current-input model, and EP is the 0–10V voltage-input model.
Q5: What is the set pressure range?
A: All four models have a set pressure range of 0.02 to 0.82MPa.
Q6: What is the pressure display resolution?
A: The display resolution is 0.001MPa, equivalent to 1kPa.
Q7: How many KRE units can one controller operate?
A: With KRE-8-2-R4 RS485 communication, one controller can connect to a maximum of 32 units.
Q8: Does the KRE Series require an external power supply?
A: Yes. The required power supply is DC24V±10%, with current consumption of 100mA or less.
Q9: What pipe port is used?
A: All four models use an Rc1/4 pipe port.
Q10: What applications is the KRE Series suitable for?
A: It is suitable for dancer-roll and air-brake tension control, welding-gun and polishing-machine press control, dispensing, air balancers, lifters, pneumatic valves, robotic handling-force control, and programmed coating control.
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