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6.1 Examples of control variantsSystems withspeed-controlled pumps<strong>Hydro</strong> <strong>MPC</strong>-E<strong>Hydro</strong> <strong>MPC</strong> booster system with three CREpumps shown below.Systems with pumps connected toone CUE variable frequency drive<strong>Hydro</strong> <strong>MPC</strong>-F<strong>Hydro</strong> <strong>MPC</strong> booster system with three CRpumps connected to an external variablefrequency drive in the control panel. Thespeed-controlled operation alternatesbetween the pumps.One CRE pump in operation.PTTM03 0993 0905One CR pump connected to an external variablefrequency drive in operation.PTTM03 1265 1505HHHsetQTM00 7995 2296HsetQTM00 7995 2296Three CRE pumps in operation.One CR pump connected to an external variablefrequency drive and two constant speed CRpumps in operation.HHHset• The <strong>MPC</strong>-E system maintains a constantpressure through continuous adjustment of thespeed of the pumps.• The system performance is adjusted to thedemand through cutting in/out the requirednumber of pumps and through parallel controlof the pumps in operation.• Pump changeover is automatic and dependson load, operating hours and fault.• All pumps in operation will run at equal speed.QTM00 7996 2296Hset• The <strong>MPC</strong>-F system maintains a constantpressure through continuous adjustment ofthe speed of the CR pump connected to theexternal variable frequency drive. The speedcontrolledoperation alternates between thepumps.• One CR pump connected to the externalvariable frequency drive always starts first. Ifthe pressure cannot be maintained by thepump, one or two constant speed CR pumpswill be cut in.• Pump changeover is automatic and dependson load, operating hours and fault.QTM00 7998 22969
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