Notes On Electrical Installation; Connection Data; Overvoltage Protection And Supply Line Load; Door Limit Switch - Rittal CS 9761.212 Montageanleitung Und Bedienungsanleitung

Note:
Take care to ensure that the enclosure with
fitted cooling unit complies with protection
category IP 55. In case of a reduced pro-
tection category, condensation may occur
inside the enclosure, and contaminated
external air may enter the enclosure.
Note:
Take care to ensure that the assembly
components are made of a suitable mate-
rial when connecting the cooling unit to the
basic enclosure. Contact corrosion can
occur if the materials mix is unsuitable.

4.4 Notes on electrical installation

When performing the electrical installation, it is im-
portant to observe all valid national and regional reg-
ulations as well as the provisions of the responsible
power supply company. Electrical installation must
only be carried out by a qualified electrician who is
responsible for compliance with the existing stand-
ards and regulations.

4.4.1 Connection data

– The voltage and frequency of the connection must
correspond to the values stated on the rating plate.
– The cooling unit must be connected to the mains
via an all-pin isolating device, which ensures at
least 3 mm contact opening when switched off.
– No additional temperature control may be con-
nected upstream of the unit at the supply end.
– Install the pre-fuse specified on the rating plate
(miniature circuit-breaker "K" characteristic or slow
fuse) to protect the cable and equipment from
short-circuits.
– The mains connection must ensure low-noise
potential equalisation.
4.4.2 Overvoltage protection
and supply line load
– The unit does not have its own overvoltage protec-
tion. Measures must be taken by the operator at
the supply end to ensure effective lightning and
overvoltage protection. The mains voltage must
not exceed a tolerance of ±10%.
– In accordance with IEC 61 000-3-11, the unit is
intended solely for use at sites with a continuous
current-carrying capacity (incoming mains power
supply) of more than 100 A per phase and with a
supply voltage of 230 V. If necessary, the power
supply company must be consulted to ensure that
the continuous current-carrying capacity at the
point of connection to the public grid is sufficient
for connection of such a unit.
RITTAL outdoor cooling unit assembly and operating instructions
4 Assembly and connection
– The fans and compressors in single-phase units
are intrinsically safe (thermal winding protection).
– Install the slow pre-fuse specified on the rating
plate (miniature circuit-breaker with "K" character-
istic, motor circuit-breaker or transformer circuit-
breaker) to protect the cable and equipment from
short-circuits. Select a suitable motor circuit-
breaker/transformer circuit-breaker in accordance
with the information specified on the rating plate:
Set it to the minimum specified value. This will
achieve the best short-circuit protection for cables
and equipment.
Example: Specified setting range 6.3 – 10 A;
set to 6.3 A.

4.4.3 Door limit switch

– Each door limit switch must only be assigned to
one cooling unit.
– Several door limit switches may be connected in
parallel and operated on one cooling unit.
– The minimum cross-section for the connection
2
cable is 0.3 mm for a cable length of 2 m.
– The line resistance to the door limit switch must not
exceed a maximum of 50 Ω.
– The door limit switch only supports a floating con-
nection; 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. 30 mA DC.
• Connect the door limit switch to terminals 1 and 2
of the connector.

4.4.4 Notes on the flicker standard

The flicker limits specified in standard EN 61 000-3-3
or -3-11 are adhered to, provided the supply imped-
ance is less than approx. 1.5 Ω.
Where necessary, the unit operator should measure
the connected impedance or consult the responsible
power supply company. If there is no way of influenc-
ing the supply impedance and sensitive installed
components (e.g. BUS) are subjected to interfer-
ence, a line reactor or starting-current limiting device
should be connected upstream of the cooling unit to
restrict the startup current of the cooling unit.
EN
29