5 Installation
EN
22
Rittal enclosure cooling unit
– Terminal voltage Uc = 350…400 V, 50/60 Hz
– Maximum current Imax = 40 kA
– Rated current In = 20 kA
– Breakdown voltage Up = 1.75 kV
Three-phase devices
– There is no need to observe a counter-clockwise or
clockwise phase rotation when making the electrical
connection to a three-phase voltage supply. The elec-
tronics incorporated into the devices automatically
create the required phase rotation.
– Outgoing equipment is monitored by the inverter, and
deactivated in the event of a malfunction in the elec-
tricity supply.
SCCR – Short-circuit resistance
Under UL508A Supplement SB, the standard SCCR for
cooling units is 5 kA.
If the device is installed on a UL508A feeder circuit
>5 kA, a protective device with the corresponding
SCCR of the feeder circuit and a peak let-through of
<5 kA should be connected upstream in the cooling unit
branch.
Door limit switch
– Each door limit switch can only be assigned to one
cooling unit.
– Several door limit switches may be operated in parallel
with one cooling unit.
– The minimum cross-section for the connection cable
is 0.3 mm² for a cable length of 2 m.
– The line resistance to the door limit switch must not
exceed a maximum of 50 Ω.
– The maximum admissible line length is 10 m.
– The door limit switch only supports a floating connec-
tion; no external voltages.
– The contact of the door limit switch must be closed
when the door is open.
– The safety extra-low voltage for the door limit switch is
provided by the internal power pack: Current approx.
5 mA DC.
Connect the door limit switch to terminals 5 and 6 of
the signal connector.
Fig. 43:
Mains connection and interfaces
Key
1
X1: Mains connection
2
X2: IoT Interface (RS485)
3
X3: Signal connections (external temperature sensor,
door operated switch and alarm relay)
4
X4: USB-C interface
5
X5: Rittal Smart Service Portal (LAN)
6
Potential equalisation (M6)
Potential equalisation
If, for EMC reasons, the unit is to be integrated into the
customer's existing potential equalisation system, a
conductor may be connected to the potential equalisa-
tion connection point. The connection point is labelled
with the required switch symbol (fig. 43, item 6).
Attach the potential equalisation to the unit's connec-
tion point using the screw, washer and contact wash-
er.
1
2
3
4
5
6
