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Maintenance and service
8
January 2017
America
45 /72
4
Undo the lock screw on the closed air vent
valve (ball valve at the pressure-retaining
valve).
5
Relieve the pressure in the aftercooler by
carefully opening the pressure relief valve.
6
Close the vent valve and screw in the sealing
screw.
7
After maintenance work is complete, open the
shutoff valve in the supply line.
Test run
After any maintenance work, a test run should
be performed to locate any leaks, among other
things. For each test run, proper and quiet
performance of the compressor should also be
ensured.
Electrical components
DANGER
Electric shock
Dangerous electrical voltage
➯
Work on the electrical equipment
may be performed by specialized
electrical technicians only.
➯
With the speed-controlled types
there is a risk of electric shocks due
to charged capacitors!
Isolate the compressor and wait
10 minutes before touching any
electrical parts.
➯
Check the DC bus voltage.
Checking the DC bus voltage of the frequency
inverter
The DC bus voltage is measured at the grid
terminal of the frequency inverter. The exact
position of the “DC+” and “DC-” terminals can be
found in the included operating instructions for the
frequency converter.
1
Measure the voltage between terminals DC+
and DC-.
2
Measure the voltage between the terminal DC+
and the chassis.
3
Measure the voltage between the terminal DC-
and the chassis.
The voltage must be zero for all three
measurements.
Water-cooled compressors
When operating water-cooled screw compressor
units please observe the following points.
•
In case of leakage a part of the oil in oil/water
coolers may penetrate into the cooling water
circuit. Cooling water must not be discharged
into public sewage systems in an uncontrolled
manner. Exclude ucontrolled overflow of oil
from separating basins into public sewage
systems. Carefully comply with the sewage
regulations and guidelines.
•
Carefully perform maintenance and repairs.
Removed tube bundles must be checked for
damage before reinstallation (and replaced
even in case of minor damage). When
assembling alwas use new seals.
8.2
Service
For any spare parts needed, the local Gardner
Denver branch or representative retailer is
available.
The local Gardner Denver subsidiary or the
responsible dealer is available for any spare parts
requirements.
It is important to provide the model name
and serial number of the compressor in all
communications.
NOTE
Order spare parts on the basis of the separately
provided spare parts list.
8.3
Inspection of protective and
safety devices
Protective covers and enclosure panels
Ensure that all protective covers and enclosures of
the compressor are installed correctly.
Protective cover for cooling air fans
Protective cover of the coupling between the
drive and compressor
Compressor housing; here especially the
openings (doors)
Safety valve
must be in perfect condition. For
example, it must not be blocked by dirt or paint.
Emergency-Stop pushbutton /Emergency-Stop
function
The switching function of the contacts can be
checked by an electrician.
NOTE
The emergency stop function may be actuated
only in dangerous situations. Otherwise
increased wear, up to and including damage to
the compressor, can be expected.
Summary of Contents for L160 110A V2
Page 1: ...User manual Screw compressor L160 L290 V2 L160RS L290RS V2 America ZS1149274 03 January 2017...
Page 7: ...Foreword 1 January 2017 America 7 72 1 6 Rating plate Fig 1 1 Rating plate...
Page 69: ...Appendix 9 January 2017 America 69 72...
Page 70: ...9 Appendix 70 72 America January 2017...