Power Connection; Operationg Conditions; Putting Into Operation And Function; General Remarks - Pfannenberg DTS Notice D'utilisation Et De Montage

6) DTFI units: Connect the device hood (C) to the earth cable
and then fix to the cooling unit by means of the screws (B).
7) Clamp cables in accordance with the connection diagram
(see rear of unit) to the plug-in connectors (enclosed
package) and connect to the unit.
- lead cross-section: 0.5 – 2.5 mm², or AWG20 – AWG14
(for the selection of the cable cross-section the relevant pro-
visions are to be taken into account).
8) Connect the cooling unit to the power source (see section 8.4).
8.4

Power connection

Caution!
•
The cooling unit must be connected to the mains by means of a
disconnecting device with a contact gap of at least 3 mm when
switched off.
•
No temperature control must be series-connected to the coo-
ling unit feed.
The fuse as indicated on the ID plate must be series-connected
as line protection.
•
Power connection and repairs, if applicable, may only be car-
ried out by authorized trained electricians.
Power supply connection (mains):
Both mains voltage and frequency must correspond to the nominal
values indicated on the ID plate of the cooling unit.
Attention: The cooling unit may be damaged if the
voltage is too high.
Refers to cooling units for nominal voltages 400 V/440V.
As an option, some units, different to the standard (400 V/
440 V), may be connected to a different mains voltage (For
voltage range see enclosed sheet).The feed cables on
the transformer primary must be unclamped for this.
Door contact:
The door contact is supplied form the cooling unit with an extra-
low voltage (<20V, 20 mA).
•
In order to avoid any disruptive influences, it is recommended
that a sheathed cable with twisted pair leads be used.
screen can be secured on one side to the PE connection point
provided on the cooling unit.
•
If the use of sheathed cables is not possible, during installation of
the cables it must be ensured that they are not routed in the imme-
diate vicinity of potential interference sources (e.g. supply lines,
components with relatively high electromagnetic emission).
Warning! No external voltage may be applied.
If no door-contact switch is used, the connecting contacts
are to be bridged.
Centralised fault indication:
For connection of the fault signal line there are 2 connection
contacts and/or connecting lines available (see circuit diagram on
the Technical Supplementary Sheet
The installation of the fault signal line is not subject to any special
requirements.
Warning! The contact may be loaded with
max. 230 V, 1A.
085 408 065f
The
1 )
9 Operating Conditions
•
Voltage must be within ± 10 % of the value indicated.
Frequency must be within ± 3 Hz of the value indicated.
•
Ambient temperature must be below 45 °C (for options see
supplement).
•
Use the unit such that the cooling capacity suits the actual
demand.
•
Use refrigerant as indicated only.
•
Use genuine spare parts only.

10 Putting into operation and function

10.1 General remarks

The cooling unit is provided with an electronic control system. The
drawn-in switch cabinet internal air temperature is measured by a
temperature sensor. By means of a DIP switch on the control board,
different switch cabinet temperatures as well as upper limit
temperatures can be selected (see accompanying sheet).
Exceeding the limit temperature generates an alarm.
Warning!
Ambient conditions and temperature in the switch cabinet must
be in accordance with the values indicated in the supplement.
Warning! Too little heat transfer at the heat
exchanger in the external circuit (condenser).
The cooling unit may only be operated with cover, otherwi-
se heat dissipation at the condenser is not sufficient, and
the cooling unit may be damaged.
Immediately after the switch-on of the service voltage, the
unit goes into the start-up/test mode. After that the evapo-
rator fan continues to run.
fans run on as required (the temperature of the switching
threshold (T ) has been reached, or are switched off
set
(temperature lower than switching threshold (T
• Free discharge of any condensate produced must be provided
to ensure trouble-free operation.
10.2

Indicator elements

The cooling unit has an operational display in the form of a LED on the
external hood of the unit. If the light of this indicator remains on when
the supply voltage is applied it shows that the unit is in the normal
operating mode. If a fault occurs or if the unit is in the start-up or test
mode, this indicator lights up in various flashing sequences which
make it easier to diagnose fault in the unit (see Sections 10.4 and 13)
10.3

Test mode / start-up

The test mode is basically activated after renewed connection of
the supply voltage and is independent of the instantaneous ambient
conditions when the door contact is closed.
First of all the unit runs through a start-up mode lasting 30 seconds
which is followed by a test mode lasting 30 seconds.
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Compressor and condenser
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set
13