Connecting Terminals In The Switch Cabinet/Control Transformer Setting; Fittings; General Maintenance And Cleaning - CompAir L15 Operating And Service Manual

9. Service and maintenance
9.9 Connecting terminals in the switch
cabinet/control transformer setting
Danger
Danger of electric shock!
Work on the control cabinet may only be
carried out by electrotechnical specialist
personnel.
When carrying out adjustment work on the
control power transformer, the unit must be
electrically isolated and locked off.
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
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 connecting terminals in the switch cabinet have to
be checked and, if required, re-tightened during first
commissioning and later on in line with the maintenance
schedule.
Fig. 25
Check the control transformer setting as follows:
Switch the unit on as described in Chapter 7.4.
•
Check the control transformer output voltages while
•
operating under load. Several tapping points are
provided for this purpose (see circuit diagram).
Switch the unit off as described in Chapter 7.6.
•
Change the control transformer setting as follows if
the output voltage is not correct:
Set the main power switch to "O" (OFF) and secure
•
it from being switched on again.
L90RS-L132RS: Please wait another 10 minutes.
•
The power condensers require this time in order to
discharge!
Change the control transformer setting accordingly.
•
Fig. 25 illustrates an example.
Then check the setting again.
•

9.10 Fittings

The fittings of the air, water and oil circuits have to be
checked and, if required, re-tightened according to the
maintenance schedule.
Check the hose and piping for unsealed areas.

9.11 General maintenance and cleaning

Important
Remove oil residues and other deposits from unit
parts and from the coolers of compressors, which
are exposed to hot compressed air, according to
the operating instructions.
Blow off the screw compressor unit with
compressed air at the specified intervals (never
direct compressed air towards persons) paying
particular attention to:
Regulating elements
•
Fittings
•
Compressor block
•
Cooler
•
Electric motor
•
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