Glanded Pumps - THERMO-ECO-ENGINEERING úvod

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Switching and Control Devices Wilo-VR, CRn, and CR control devices Control modes Differential pressure – variable (p-v) Delivery head H [m] Power requirement P [%] 100 36 16 100 25 12 n = 60% n = 40% n = 60% n = 100% n = 100% n = 40% Q [%] Q [%] ∆p = constant Control range Control range / savings potential Fig.: Pump curve behaviour for stepless variable differential-pressure control (p-v) When refurbishing or upgrading existing systems it is not always possible to evaluate the point in the circuit which shows the lowest differential pressure. Original installations have been completed years ago and now, after installing thermostatic valves, noise problems have developed. The index circuit of the system is not known or it is not possible to integrate new sensor connections. A control-range extension is nevertheless possible using the p-v control mode (recommended for single-pump systems). A processor unit of the control system adapts the differential-pressure setpoint value to a predetermined variable differential-pressure curve by means of setpoint / actual-value comparison. In addition operation, the differential pressure is kept constant at the design level after the first peak-load pump has been cut in. >Required accessory: - DDG differential-pressure sensor 176 Subject to change without prior notice 09/2006 WILO AG
Switching and Control Devices Wilo-VR, CRn, and CR control devices Control modes Differential pressure – delivery-superimposed (p-q) Delivery head H [%] Power requirement P [%] Fig.: The pump curve behaviour of a multi-pump system with stepless delivery-superimposed differential pressure control (p-q) Wilo Catalogue A2 - <strong>Glanded</strong> pumps Flow volume Q [%] Δp = constant Δp = deliverysuperimposed Key: Pu H = main pump Pu S = peak load pump Q V = full-load flow volume Q T = part-load capacity P 1V = full-load power consumption P 1T = part-load power consumption In order to avoid the time and expenditure associated with index-circuit evaluation (extensive and expensive cable routing, amplifiers, etc.), it is possible to superimpose the setpoint differential-pressure value directly with a signal proportional to delivery. Using this method, it is possible even with multi-pump systems to achieve a control-range extension in spite of central measured-value acquisition (differential pressure sensor at the pump). This method requires, in addition to the differential pressure sensor which is to be fitted directly on the pump system, the heating-circuit output or the input of the consumer rail, the onsite provision by the customer of a volumetric-flow transmitter (0 / 4– 20 mA) to be installed in the system's main feed pipe. The use of p-q-control is recommended for such systems whose index circuit or system performance are not known or in such cases where long signal distances cannot be bridged, particularly for such systems where flow volumetric-flow transmitters are already available. >Required accessory: - DDG differential-pressure sensor - Volumetric-flow transmitter (onsite) 177 Planning Guide Energy-saving pumps Standard pumps Special In-line <strong>Pumps</strong> Switching and Control Devices Pump Management Systems
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Catalogue Heating, Air-Conditioning
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Contents Wilo Catalogue A2 - Glande
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General Notes and Abbreviations Not
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Planning Guide Maintained pressure
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Planning Guide Mechanical seal A me
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Planning Guide This can take the fo
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Planning Guide Principle of operati
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Energy-Saving Pumps Contents Energy
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Energy-Saving Pumps Single-head pum
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Energy-Saving Pumps Twin-head pumps
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Energy-saving pumps Single-head pum
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Energy-saving pumps Twin-head pumps
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Standard Pumps Contents Standard Pu
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Standard Pumps Single-head pumps In
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Standard Pumps Double pumps In-line
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Standard Pumps In-line pumps Techni
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Standard Pumps Single-head pumps (H
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Page 193 and 194: Terminal Diagrams Wilo-CRn, Wilo-CR
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Page 219 and 220: Pumpen Intelligenz. Worldwide the n
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Glanded Pumps - THERMO-ECO-ENGINEERING úvod

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