User manual

Rittal enclosure cooling unit 21

5 Installation

Fig. 34: Connections at rear

Key

1 Connection for communication module (X3)

2 Connection for signal connector (X2)

3 Connection for mains connector (X1)

4 Bolt (here with fitted earth clamp)

Potential equalisation

If the unit is to be integrated into the customer's existing

potential equalisation system for EMC reasons, a con-

ductor with a larger nominal cross-section of at least

10 mm² can be connected to the potential equalisation

connection point (attachment points) on wall-mounted

cooling units. The connection point is labelled with the

required switch symbol.

Fig. 35: Connection point for potential equalisation

Key

1 Connection point



Attach the potential equalisation to the unit's connec-

tion point using the screw, washer and contact wash-

er.

Fig. 36: Potential equalisation arrangement

Key

1 Ring terminal with PE conductor

2 Contact washer

3Washer

4 Screw

5.4.2 Install the power supply



Remove the mains connector from the dispatch bag

and connect to the mains as shown on the connection

diagram (fig. 37 or fig. 38).

Fig. 37: Circuit diagram SK 3186930 and SK 3187930

Note:

According to the standard, the PE conductor

in the mains connection cable is not classed

as an equipotential bonding conductor.

Note:

– The mains supply must be of a shielded

design with preferred EMC types in order

to achieve the values required by the

standard.

– The earth clamp may be used to contact

the cable shielding with the enclosure in-

side the connection box (fig. 34, item 4).