User manual

5 Installation
EN
22 Rittal enclosure cooling unit
Fig. 38: Circuit diagram SK 3188940 and SK 3189940
There is also a cover for the connection box included in
the dispatch bag.
 Insert the EMC cable gland included with the supply
into the openings in the cover to ensure adequate
strain relief for the connection cable.
 Close the connection box with the cover.
 Cover any unused openings in the cover with sealing
bungs.
When connecting the cooling unit in accordance with
NFPA 70 (NEC):
 Use a conduit fitting instead of the cable gland.
 Use copper conductors only to connect the supply ca-
ble to the mains connector.
5.4.3 Connect the alarm relays
System messages from the cooling unit may be output
to an external signal source via two floating relay out-
puts.
 Connect a suitable connection cable to the connec-
tion terminals 1 (Alarm K1) and/or 3 (Alarm K2) of the
signal connector (X2).
 Configure the alarm relays you wish to use to output
error messages (see section 7.4.2 "Alarm relays").
5.4.4 Interfaces
The cooling unit has the following interfaces for commu-
nicating with external systems:
– Micro-USB interface on the front
– RS 485 interface on the rear
–NFC interface
Micro-USB interface
A micro-USB interface is located on the front, to the right
of the display. A tablet or laptop may be connected here
for easy configuration of the unit.
 Connect a tablet or laptop with installed RiDiag soft-
ware to the micro-USB interface.
No other USB devices will be detected on this connec-
tion.
RS 485 interface
An RS 485 interface is located on the rear of the connec-
tion box. The communication module with which you
can connect the cooling unit to a monitoring system
(Rittal CMC), may be connected here.
 Connect the communication module (available as an
accessory) to the RS 485 interface.
NFC interface
The cooling unit may be accessed with a smartphone
app via the integral NFC interface. Access is only possi-
ble with the app supplied by Rittal.
Note:
The factory setting of the relay outputs in their
de-energised state is NO (Normally Open).
AC
cos φ = 1
I max. = 2 A
U max. = 250 V
Tab. 2: Contact data
Note:
A direct connection to the cooling unit via the
RS 485 interface is not possible.