Applying Variable Speed Drives to Control Pressure

7/25/2019 Applying Variable Speed Drives to Control Pressure

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Applying Variable Speed Drives ToControl Pressure

Applying Variable Speed Drives To Control Press ure (on photo: ABB 's Variable Speed Drives credit:

bacnetinternational.net)

Pressure Control Pump Station //

Using variable speed drives (VSDs) to control pressure reduces the electrical

energy requirements .

A basic pressure control pump station is equipped with one pump controlled by one

variable speed drive (VSD). In some pump stations, pumps connected in parallel

are a more efficient solution. Several parallel pumps can be controlled with one

VSD controlling the master pump and contactors switching the other pumps on and

off.

Figure 1 shows a set-up with parallel pumps using one drive to control three

pumps.

Figure 1 Pressure control of a pumping system with one variable speed

drive (VSD)

by reducing the amount of hydraulic energy actually produced

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SystemRedundancy

To guarantee

pump

operation, even

when a fault

occurs, the

pump system

needs

redundancy. In

pump stations

this means that

a failure of one

pump, motor or

drive in aparallel

installation does

not cause a

process interruption but the operation will continue with a limited capacity.

In order to have a replacement for a failed unit, a parallel system is needed! This

means that each pump is controlled by an industrial drive for pump control.

Drives share information such as status of the

drive, priority, running time, process feedback,

etc. through a fiber optic link.

In a ring connection implemented with fiber optics it is possible to define the actions

for the drives in the event of failure of the optical link in order to achieve 100%

redundancy. No PLC is needed.

Figure 2 shows a system loop with three industrial drives in ring connection

controlling three pumps.

Figure 2 Pressure control with three industrial drives

Might be interesting for you to try free Pump Efficiency Calculation Tool(MS


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Excel

Spreadsheet).

Pump Efficiency Calculation Tool

Reference // ABB Application guide No. 2 Using variable speed drives (VSDs) in

pump applications

DOWNLOAD TOOL
http://electrical-engineering-portal.com/download-center/electrical-software/pump-efficiency-calculation


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About Author //

Edvard Csanyi

Edvard- Electrical engineer, programmer and founder of

EEP. Highly specialized for design of LV high power busbar

trunking (

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Applying Variable Speed Drives to Control Pressure