Grundfos Control MPC Montage- Und Betriebsanleitung Seite 13

Systems with speed-controlled pumps
Control MPC-E/-EC
Three E-pumps in operation.
Control MPC-E/EC maintains a constant
pressure through continuous adjustment of the
speed of the pumps.
The system performance is adjusted to the
demand through cutting in/out the required
number of pumps and through parallel control
of the pumps in operation.
Pump changeover is automatic and depends
on load, operating hours and fault.
All pumps in operation run at the same speed.
The number of pumps in operation also
depends on the energy consumption of the
pumps. If only one pump is required, two
pumps will be running at a lower speed if this
results in a lower energy consumption. This
requires that the differential pressure of the
pump is measured and pump curve data are
available for the controller.
Systems with pumps connected to one
CUE frequency converter
Control MPC-F
One pump connected to a Grundfos CUE
frequency converter and two mains-operated
pumps in operation.
Control MPC-F maintains a constant pressure
through continuous adjustment of the speed of
the pump connected to the Grundfos CUE
frequency converter. The speed-controlled
operation alternates between the pumps.
A pump connected to the Grundfos CUE
frequency converter always starts first. If the
pressure cannot be maintained by the pump,
one or two mains-operated pumps will be cut
in.
Pump changeover is automatic and depends
on load, operating hours and fault.
Systems with mains-operated pumps
Control MPC-S
Three mains-operated pumps in operation.
H
Control MPC-S maintains an almost constant
pressure through cutting in/out the required
number of pumps.
The operating range of the pumps lies
between Hset and Hstop (cut-out pressure).
Pump changeover is automatic and depends
on load, operating hours and fault.
Q
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