Version Nr. 1-1 - 23.08.2017
Doc. Nr. 994020009
6 / 14
8. Electrical connection
High electric voltage present. Installation, maintenance, cleaning and
any other work must be carried out by qualified personnel only. The
personnel must ensure that for the duration of this work the unit and
the cabinet are disconnected from the electrical supply and protected
against unauthorised/accidental reconnection.
Note: As soon as preperations are finished, mounting procedures may proceed.
Connection to the main electrical supply
The mains connection is made via a connector / terminal block. To connect the unit to the mains
proceed as follows:
Take the control cabinet out of operation in the prescribed manner.
●
See the connection details on the circuit diagram.
●
Attention
Between contact 3 & 4 there is a 12V DC potential. These connections are to be connected to a door
switch only! If no door switch is used, these contacts are to be bridged and protected from
unauthorized and/or accidental external contact. Contacts 1 & 2 are potential free and require an
external power source if wired to operate external components (indicator lamps, switches...). The load
on these contacts is not to exceed 30V DC, 4 A or 120/250V AC, 4 A. If wired to external components it
must be ensured that the wiring and connections are double insulated and safe against touch and
protected from unauthorized and/or accidental external contact.
Ensure that the correct polarity is maintained. The fans should have
clockwise rotation.
Fault warning connection
The fault warning is connected via terminals 1 & 2 on the connection terminal block. The temp.
adjustment range is between 25°C (left-hand stop) and 55°C (right-hand stop). The alarm temp. is
preset at 55°C.
To change the alarm setting:
Remove the outer cover.
●
Remove the fixing screws from the PCB cover and the earth wire from inside it.
●
Lift off the PCB cover
●
Using a screwdriver turn the alarm temp. potentiometer on the PC-board slightly to the right (higher)
●
or the left (lower)
please note that the setting for the alarm signal must be at least 5°C higher than the setting for the
●
cabinet's internal temperature
Close the unit as prescribed.
●
Check that the new setting meets requirments and if not repeat the above process.
Door contact switch connection
