Grundfos CU 301 Instrucciones De Instalación Y Funcionamiento página 6

2.2 Electrical connection
For recommended fuse sizes. See section
8. Technical data.
CU 301 has two terminal blocks:
• Screw terminals 1 to 4.
• Spring terminals 5 to 7.
Furthermore, CU 301 is equipped with two screw
terminals for the protective-earth conductors (PE).
The on/off button on CU 301 must not be used as a
safety switch when installing and servicing the pump.
POWER PUMP
PE
PE
L N N L
Electrical connection of CU 301
Legend
Pos. Description
Standard pressure sensor. + 24 VDC,
1
brown conductor, terminal 5.
Standard pressure sensor. Input signal,
2
black conductor, terminal 6.
Standard pressure sensor. Screen,
3
terminal 7.
4 Standard pressure sensor.
Related information
8. Technical data
6
3
1
2
4
2.2.1 Mains supply
POWER, terminals 1, 2 and PE
Connect terminals 1 and 2 to the phase and neutral
conductors of the mains supply. Each terminal can be
connected to any of the two conductors.
Connect the PE terminal to the green and yellow
earth conductor. Each PE terminal must be
connected to an earth conductor of its own.
Maximum cross-section of the conductors to be
2
connected is 6 mm .
Back-up fuse: Maximum 16 A.
The conductors of the mains supply must
not be connected to terminals 3 and 4
(PUMP).
2.2.2 Pump supply
PUMP, terminals 3, 4 and PE
Connect terminals 3 and 4 to the phase and neutral
conductor of the pump. Each terminal can be
connected to any of the two conductors.
Connect the PE terminal to the green and yellow
earth conductor. Each PE terminal must be
connected to an earth conductor of its own.
Maximum cross-section of the conductors to be
2
connected is 6 mm .
Pressure sensor
DANGER
Electric shock
Death or serious personal injury
‐
The total load of terminal 5, +24 VDC,
must not exceed 100 mA.
SENSOR, terminals 5, 6 and 7:
Terminals 5, 6 and 7 (SENSOR) are used for the
pressure sensor.
Sensor signals:
The sensor to be connected must give signals within
one of the following ranges:
• 0-10 V.
• 2-10 V.
• 0-20 mA.
• 4-20 mA.
Changeover between current and voltage signals is
carried out by means of Grundfos GO Remote.