Location; Enclosure Class; Terminals; Cables - Grundfos CU 3 Serie Instrucciones De Instalación Y Funcionamiento

Warning
Short-circuit protection
The installation must incorporate external
fuses.
EU/IEC:
Use fuses that comply with IEC 60127.
Rated maximum 10 A, minimum 250 VAC
in both line and in neutral when connecting
the controller to the power source.
USA and Canada (branch circuit
protection):
Use a UL/CSA-listed non-time delay,
class-rated Branch Circuit Fuse (such as
class RK5) rated maximum 10 A, minimum
250 VAC in both line and in neutral when
connecting the controller to the power
source.
Warning
The terminals are only separated with
basic insulation. Therefore, do not connect
a PELV circuit to a terminal adjacent to a
terminal connected to live voltage.
PELV circuits and live wires must be
separated with double or reinforced
insulation.

4.1 Location

The CU 3X2 is designed for installation in the front of
a control panel or a separate cabinet.
For outdoor installation the CU 3X2 must be
mounted in a control cabinet with an enclosure class
of minimum IPX4.

4.2 Enclosure class

The CU 3X2 is IP55 when mounted in the front of an
IPX4 enclosure. The cabinet must be of a
flame-retardant material.
USA and Canada
The CU 3X2 is type 3R when mounted in the front
of a cabinet with type rating 1, 2, 3, 3R, 5, 12, 12K
or 13.
8

4.3 Terminals

All terminals are suitable for conductors of 0.5 to
2
2.5 mm or AWG 20-13.

4.4 Cables

Cables must be rated min. 70 °C.

4.5 Security

Grundfos connected products must be behind a
firewall or connected to a private network.
If a firewall or private network is not in place, the
Grundfos product may be subject to a cyber-security
risk and becomes vulnerable to an attack or
compromise.
Follow the highly recommended configuration
requirements below. If in doubt, consult an IT
Infrastructure Specialist.
4.5.1 CU 352/354/362/372/3X2 DH
CU 3xx is a traditional network connected device and
must be placed on a private network behind a
firewall. It must not be connected directly to the
Internet. Also, no TCP/IP ports must be forwarded to
the product. If you need remote access to the device,
you must use technologies such as Virtual Private
Networks (VPNs) to ensure a secured connection.
Consider contacting an IT Infrastructure Specialist to
establish such a solution.
Grundfos
device
Firewall
Fig. 6 Secure connectivity for
CU 352/354/362/372/3X2 DH
Internet