德國費(fèi)斯托比例壓力閥技術(shù)參數(shù)， CRQS-1/4-6
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Choice of different setpoint specifications
– Current input – Voltage input
Integrated pressure sensor with separate output Cable break monitoring
Innovative Versatile Reliable Easy to mount
High repetition accuracy Modular product system
a system deviation will also appear if the reference variable is constant but the controlled variable changes.
element. The output of the final control element acts on the controlled system.
The closed-loop control element thus attempts to compensate for
the difference between the reference variable w and the controlled variable x by using the final control element.
the regulator attempts to readjust the controlled variable x to the reference variable w.
Multi-sensor control (cascade control) of the VPPM
Unlike conventional direct-acting regulators,
with multi-sensor control several control circuits are nested inside each other.
Easy replacement of the valves Tested units Easy extension of the valve terminal
The figure shows a closed-loop control circuit.
The reference variable w (setpoint value, e.g. 5 volts or 8 mA) initially acts on a comparator.
Choice of regulation characteristic
High dynamic response 2 accuracy levels
For all common protocols As an individual pressure regulator
As a pressure zone regulator Choice of 3 valves with different pressure ranges
3 pressure ranges (presets) can be set via the bus
An example of this is when the pressure drops in the air supply.
The disturbance variable z acts on the controlled variable x unintentionally. In all cases,=
Multi-sensor control (cascade control) Diagnostics
Choice of regulation characteristic
Temperature compensated High dynamic response .
Multi-sensor control significantly improves control precision and dynamic response in comparison with singleacting regulators.
– Adjustment/selection buttons
Choice of valves with different pressure ranges
Pressure range can be modified on the valve
Individual valves (in-line valve) Various user interfaces
– LED displays – LCD display
This process runs continuously so changes in the reference variable are always detected. However,
The overall controlledsystem is divided into smaller subcontrolled circuits that are easier to control for the specific task
This happens when the flow through the valve changes in response to a switching action, a cylinder movement or
a change in load. The disturbance variable z will also cause a system deviation.
Pressure is maintained if the controller fails
H-rail mounting Individually via mounting bracket QS fittings
Innovative Versatile Reliable Easy to mount
Multi-sensor control Diagnostics via the bus
Internal or external compressed air supply possible
Long service life LED display for the operating status
Pressure is maintained if the supply voltage fails
Fast troubleshooting thanks to LEDs on the valves and diagnostics via fieldbus
Ease of servicing through replaceable valves
The measuring device sends the value of the controlled variable x (actual value, e.g.
3 bar) to the comparator as a feedback signal r.
The closed-loop control element detects the system deviation e and actuates the final control
