Grundfos Booster set Hydro MPC-E 2 CRE32-4-2 U2 D-A-G-A

The pressure booster system Hydro MPC-E, supplied as compact assembly, maintains a constant pressure through
continuous adjustment of the speed of the pumps.
The system performance is adapted 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, time and fault.
From 0.37 to 11 kW, the booster set is equipped with CRE pumps with electronically commutated permanent magnet
motor with extremely high efficiency.
The total efficiency of this motor including the frequency converter is better than the IE4 level in IEC60034-31, even
though this standard only applies for the motor.
From 15 to 22 kW the booster is equipped with CRE pumps with integrated frequency controlled motors. The total
efficiency of this motor including the frequency converter is better than the IE3 level in IEC60034-31, even though this
standard only applies for the motor.
From 30 kW the booster is equipped with CR pumps connected to an external Grundfos CUE frequency converter
(one per pump).
The system consists of these parts:
– vertical multistage centrifugal pumps, type CRE32-4-2. Pump bases and heads are of either cast iron
EN-GJS-500-7; other vital parts are made of stainless steel EN DIN 1.4301 (AISI 304).
The pumps are equipped with a service-friendly cartridge shaft seal, HQQE (SiC/SiC/EPDM).
– Two manifolds of galvanized steel.
Base frame of galvanized steel up to CR 90; above CR90 the pumps are placed on
a galvanized I-Beam frame.
One non-return valve and two isolating valves for each pump.
Adapter with isolating valve for connection of diaphragm tank.
Pressure gauge and pressure transmitter (analog output 4-20 mA).
Control MPC in a steel cabinet, IP 54, including main switch, all required fuses,
motor protection, switching equipment and microprocessor-controlled CU 352.
Dry-running protection and diaphragm tank are available according to the list of accessories.
Pump operation is controlled by Control MPC with the following functions:
– Intelligent multi-pump controller, CU 352.
Constant pressure control through continuously variable adjustment of the speed of
each individual pump.
PID controller with adjustable PI parameters (Kp + Ti).
Constant pressure at setpoint, independent of inlet pressure.
On/off operation at low flow.
Automatic cascade control of pumps for optimum efficiency.
Selection of min. time between start/stop, automatic pump changeover and pump
priority.
Automatic pump test function to prevent idle pumps from seizing up.
Possibility of standby pump allocation.
Possibility of backup sensor (redundant primary sensor).
Manual operation.
Possibility of external setpoint influence
Log function
Setpoint Ramp
Possibility of digital remote-control functions:
system on/off,
max., min. or user-defined duty
up to 6 alternative setpoints.
Digital inputs and outputs can be configured individually.
Pump and system monitoring functions:
minimum and maximum limits of current value
inlet pressure
motor protection.
Sensors monitored against malfunction.
Alarm log with the previous 24 warnings/alarms.
Display and indication functions: