9. Service and maintenance
44
9.8 Safety valve
Fig. 23
1 Safety valve
2 Valve cap
Testing the safety valve
The valve should be tested on a separate compressed
air line in accordance with local legislation.
Operate the safety valve (- 1 - Fig. 23), depending on
the type of valve:
Slightly turn the valve cap (-2- Fig. 23) (1-2 turns), and
then re-close it.
Actuation of the bleeding lever/pulling ring
Danger
Never operate a screw compressor system with a
defective safety valve or without safety valve!
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.
• 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. 24
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.
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