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<strong>Grundfos</strong> E-<strong>pumps</strong><br />
7<br />
7. E-<strong>pumps</strong> in parallel<br />
Control of E-<strong>pumps</strong> connected in<br />
parallel<br />
E-<strong>pumps</strong> represent a complete system consisting of<br />
pump, variable frequency drive, PI controller and in<br />
some cases a sensor. E-<strong>pumps</strong> offer a closed-loop<br />
control solution resulting in for instance constant<br />
pressure in the system.<br />
In some applications, parallel pump operation is<br />
required for one or more of the following reasons:<br />
• One pump cannot achieve the required performance<br />
(flow).<br />
• Standby capacity is required to ensure reliability of<br />
supply.<br />
• Overall efficiency needs to be improved in case of<br />
big variations in the flow demand.<br />
E-<strong>pumps</strong> in parallel<br />
The table below shows the possibilities of controlling<br />
E-<strong>pumps</strong> connected in parallel.<br />
Parallel operation<br />
Control possibilities<br />
Built-in duty/standby function<br />
CRE, CRIE, CRNE with<br />
sensor<br />
CRE, CRIE, CRNE,<br />
SPKE, CKE,<br />
MTRE, CME<br />
without sensor<br />
●<br />
●<br />
Hydro Multi-E<br />
● -<br />
BoosterpaQ Hydro MPC<br />
● -<br />
● Available.<br />
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