6. Preparations for commissioning
29
The electrical connection and protective measures
have to be installed in accordance with VDE, BS or
local regulations. As a rule, additional instructions
of the relevant power supplier have also to be
adhered to.
The electrical connections must be made by an
authorized specialist.
Attention: Interference voltage!
If external electric circuits, which cannot be cut out
via the main switch, are connected to the control,
these have to be identified according to EN60204.
Warning signs have to be fixed near the main
switch and near these electric circuits. In addition,
these conductors have to be laid separately and/or
identified by colors. Work on control cabinets may
only be carried out by electrotechnical specialists.
If the installation conditions of the system differ
from the conditions described in EN60204, please
contact your technical adviser.
To establish an electrical connection, proceed as
follows:
Guide in supply cable at cable entry ( - 1 - Fig. 10) and
tighten screw connection.
Connect the supply line to the connecting terminals as
shown in the circuit diagram.
Fig. 10
Checking the setting of the control-power
transformer
The control-power transformer is factory-preset to the
rated voltage. However, practice has shown that the
actual supply voltage often differs from this value. In
order to adjust the unit to the local conditions, the
setting of the control-power transformer must be
checked by measuring the control-power transformer
output voltages during under load operation and, if
required, re-set. Several tapping points are provided for
this purpose (see circuit diagram). Fig. 11 illustrates an
example.
Fig. 11
Danger
When carrying out adjustment work on the control
power transformer, the unit must be electrically
isolated and locked off.
Work on the control cabinet may only be carried
out by electrotechnical specialist personnel.
Only L07RS-L11RS and L07RS FS-L11RS FS:
Danger of electric shock from loaded condensers!
Please always first disconnect the system from the
power supply and wait another 10 minutes before
touching the electrical components. The power
condensers require this time in order to discharge!
Important
A wrong setting of the control-power transformer
jeopardizes the trouble-free operation of
compressor units and can result in malfunction or
damage.
The verification of the control-power transformer
setting is a must during commissioning and
periodic inspection/maintenance, as the voltage
supply conditions may vary.
The correct setting should be checked during
under load operation of the unit by measuring the
control power transformer output voltages.
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