7 Preparations for commissioning
27
7.3.1
Check setting of the fan motor
protection switch
Check the setting of the motor protection switch in
accordance with the enclosed circuit diagram for the
compressor.
Set the protection switch to the value stated in the table
corresponding to the mains voltage and frequency (see
circuit diagram).
7.3.2
Checking the setting of the control-
power transformer
DANGER
High Voltage – Hazard of Shock, Burn, or
Death.
•
The electrical connection should be
made by a qualified electrician.
•
Only perform checks and carry out work
on the screw compressor when the unit
is out of operation, depressurized, and
secured from being switched on again!
NOTICE
Incorrectly setting the control transformer poses
a risk to the trouble-free operating of the
system.
Checking the setting of the control transformer
is part of commissioning and part of regular
inspection/maintenance because the supply
voltage can change.
The correct setting should be checked by
measuring the control transformer’s output
voltage while the system is running with a load.
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.
Before first commissioning, set the measured supply
voltage on the control transformer. Fig. 11 illustrates an
example.
Following first commissioning, the setting of the control
transformer must be inspected while operating under
load and corrected where necessary. (see Chapter
10.9).
Fig. 11
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