Electrical Connection; Power Supply; Pump Supply - Grundfos CU 301 Instrucciones De Instalacion Y Operacion

3.2 Electrical connection

The on/off button on the CU 301 must not be used as
a safety switch when installing and servicing the
pump. Mains disconnect must be provided by the
installer.
Raintight or wet location hubs that comply with the
requirements in the standard for Fittings for Conduit
and Outlet Boxes, UL514B, must be used. Suitable
devices for CU 301 are rated with enclosure type 3,
3R, 3S, 4, 4X, 6 or 6P.
The supply voltage and frequency are marked on the
nameplate. Ensure that CU 301 is suitable for the
power supply on which it will be used.
If CU 301 is connected to a power supply where a
Ground Fault Circuit Interrupter (GFCI) is used as an
additional protection, this device must trip when
ground fault currents with DC content (pulsating DC)
occur.
For recommended fuse sizes and maximum leakage
current, see section 9. Technical
CU 301 has two terminal blocks:
• Screw terminals 1 to 4.
• Spring terminals 5 to 9.
Furthermore, CU 301 is equipped with two screw
terminals for the ground conductors (PE). Always
use copper conductors approved for 60/75 °C (140/
167 °F).
The on/off button on CU 301 must not be used as a
safety switch when installing and servicing the pump.
POWER
PUMP
1
2 3 4
PE
PE
L N N L
Fig. 2 Electrical connection of CU 301
6
data.

3.2.1 Power supply

POWER, terminals 1, 2 and PE
Connect terminals 1 and 2 to the phase (L1) and
neutral(L2) conductors of the power supply. Each
terminal can be connected to any of the two
conductors. Torque: 15 lbf-in.
Connect the PE (ground) terminal to the green and
yellow ground conductor. Torque: 9.0 - 15.3 lbf-in.
Each PE (ground) terminal must be connected to a
ground conductor of its own.
Maximum wire size of the conductors to be
connected is 10 AWG.
Circuit breaker: maximum 16 A.
The conductors of the power supply must
not be connected to terminals 3 and 4
(PUMP).

3.2.2 Pump supply

PUMP, terminals 3, 4 and PE
Connect terminals 3 and 4 to the phase (L1) and
neutral (L2) conductors of the pump. Each terminal
can be connected to any of the two conductors.
Torque: 15 lbf-in.
Connect the PE (ground) terminal to the green and
yellow ground conductor. Torque: 9.0 - 15.3 lbf-in.
Each PE (ground) terminal must be connected to a
ground conductor of its own.
Maximum wire size of the conductors to be
connected is 10 AWG.
In situations where multiple CU 301 pump power
cables are run in parallel in wiring trays or conduits
and less than 10-12 inches (254-305 mm) apart, the
possibility of undesired communication between
units exists.
When this occurs, the indicator light for service alarm
comes on, and 'No contact to pump' is logged in the
alarms and warnings. This can be viewed using
Grundfos GO Remote. See section 6.3.11 Number.