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 – constant (p-c) Delivery head H [%] Power requirement [%] Control range Flow volume Q [%] Flow volume Q [%] Control / savings range Linearity/hysteresis approx. ± 2 % ∆p-level = constant Fig.: Pump curve behaviour for stepless constant differential-pressure control (p-c) The differential-pressure setpoint set at the CR / CRn unit will be maintained constant over the entire volume flow range. I.e., any reduction of flow volume (Q) due to throttling of the hydraulic regulating devices will in turn decrease the pump performance to match actual system demand by reducing the speed of the pump. In parallel with speed alteration, the power consumption is reduced to below 50 % of the nominal power. The application of differential-pressure control requires a variable flow volume in the system. Peak-load operation, e. g. in conjunction with a twin-head pump, will be effected automatically and load-sensitively by the control system. If the capacity of the controlled base-load pump becomes insufficient to cover the increasing load demand the second pump will automatically be started to operate in parallel to cover the risen demand. The variable speed pump will then be run down until reaching the preset differential-pressure setpoint value. >Required accessory: - DDG differential-pressure sensor 174 Subject to change without prior notice 09/2006 WILO AG
Switching and Control Devices Wilo-VR, CRn, and CR control devices Control modes Index circuit evaluation Power cable min. 5 x ... mm2 cross-section according to local regulations Fig.: Block diagram for impulse-selector operation Wilo Catalogue A2 - <strong>Glanded</strong> pumps Motor cable, shielded 7 x 1,5 mm2 Cable, shielded 2 x 1,5 mm2 *** Power cable min. 3 x 1,5 mm2 *** Sensor cable, shielded 3 x 1,5 mm2 *** Impulse selector cable, shielded 2 x 1,5 mm2 All cables onsite Fixing sundries and cable onsite Power cable min. 3 x 1,5 mm2 DDG impulse selector DDG transformer DDG DDG DDG DDG It is generally recommended to pick off the differential-pressure directly at the pump and to maintain it there at a constant level. An alternative would be to install the signal transmitter in the heating system as a remote signal transmitter in the so-called index circuit of the system (control-range extension). Operation with a remote signal transmitter will partly allow much larger speed reductions and thus pump performance reductions. It is essential in this respect that the selected measuring point be valid for the consumption performance of all the system sections. Where this calculated measuring point in the index circuit may be subject to shifting to other parts of the pipe system, optimisation by means of the Wilo DDG impulse selector is preferable. Measuring points ranging from 2 to 4 can be compared on a continuous basis. Only the lowest measured value forms the basis for the setpoint / actual value comparison by the CR controller. >Required accessory: - DDG differential-pressure sensor - Power supply unit DDG (for each DDG) - Impulse selector DDG (2...4 DDG) 175 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 123 and 124: Standard Pumps Twin-head pumps (Hea
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Page 171 and 172: Switching and Control Devices Wilo-
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Page 193 and 194: Terminal Diagrams Wilo-CRn, Wilo-CR
Page 199 and 200: Pump Management Systems Wilo-Contro
Page 219 and 220: Pumpen Intelligenz. Worldwide the n
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Glanded Pumps - THERMO-ECO-ENGINEERING úvod

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