Location; Enclosure Class; Terminals; Cables - Grundfos CU 3X2 Montage- Und Betriebsanleitung

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.

4.3 Terminals

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

4.4 Cables

Cables must be rated min. 70 °C.
8

5. Mechanical installation

Fasten the CU 3X2 with the four screws, M5 x 10,
supplied with the unit (pos. 1).
Maximum torque: 1.4 Nm.
Dimensions of the CU 3X2, see section
14. Dimensions.
Min. 1.5 mm
Max. 3 mm
Fig. 6 Mounting in panel front (standard)
In order to achieve enclosure class IP55,
Note
the CU 3X2 must be mounted in a panel or
cabinet.
Connect the earth terminal (between the cable
clamps) on the CU 3X2 to the mounting frame (pos.
2, fig. 6). See fig. 7.
Fig. 7 Earth connection