9. Service and maintenance
48
9.9 Changing V-belts/automatic
tensioning system
Danger
Only perform checks and carry out work when the
screw compressor unit is out of operation and
depressurized, electrically isolated and locked off.
Any safety equipment which had to be removed for
the replacement of the V-belt set must be
remounted after completion of this work.
Important
The replacement of a single V-belt is not permitted,
always replace a complete V-belt set.
During the entire service life of the V-belt set, no
readjustment of the automatic V-belt tensioning
system will be necessary.
Fig. 22
1 Holder
2 Motion screw
3 Lock nut
4 Rotational axis
5 V-belt set
The V-belt preload needed is specified by the weight of
the motor, which is mounted in a rotary fashion (- 4 -
Fig. 22).
Changing the V-belt is carried out as follows:
• Open front panel
• Lift the motor by turning the motion screw
(- 2 - Fig. 22) counterclockwise until the V-belts are
released
• Clean/degrease the V-belt pulleys
• Replace the V-belt set (- 5 - Fig. 22)
• Screw the belt adjusting bolt back until it reaches
the lock nut (- 3 - Fig. 22). Tighten lock nut on holder
(- 1 - Fig. 22).
• Close the front panel
9.10 Connecting terminals in the switch
cabinet/control transformer setting
Danger
In the case of electric voltage:
•
Actuate STOP button
at the operating panel
•
Set the customer-fitted main power switch to
"O" (OFF).
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.
The setting of the control transformer must be checked
according to chapter 6.3 “Electrical connection”.
9.11 Fittings
The fittings of the air 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.
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