Checking The Control Transformer Setting - CompAir L15 Operating And Service Manual

6. Preparations for commissioning
6.4.2 Checking the control transformer
setting
Warning
Danger of electric shock!
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 L90RS-L132RS: 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
Making incorrect settings to the control transformer
poses a risk to the trouble-free operating of the
system.
In the case of an ungrounded 3-phase power
supply (IT-Net), please note the relevant
instructions in the documentation of the inverter
supplied with the drive.
If a Residual Current Detector (RCD) is used as a
system ground fault monitor, only Type B (value
and delay adjustable) devices should be used to
avoid nuisance tripping.
Fig. 13
The control transformer is preset for the rated voltage at
the factory. Experience shows that in practice the actual
supply voltage can differ.
32
Before first commissioning set the measured supply
voltage on the control transformer. Fig. 13 shows an
example.
Following first commissioning the setting of the control
transformer must be inspected while operating under
load and corrected where necessary (see section 9.9).