KAESER KOMPRESSOREN SX User manual

Service Manual
Screw Compressor
SX SIGMA CONTROL BASIC
9_6919 04 E
Manufacturer:
KAESER KOMPRESSOREN GmbH
96410 Coburg • PO Box 2143 • GERMANY • Tel. [phone] • Fax [phone]
http://www.kaeser.com

Original instructions
/KKW/SSX 1.04 en SBA-SCHRAUBEN-SCB

1 Regarding this document
1.1 Using the Document ......................................................................................................... 1
1.2 Further documents ........................................................................................................... 1
1.3 Copyright .......................................................................................................................... 1
1.4 Symbols and Identification ............................................................................................... 1
1.4.1 Warnings ............................................................................................................. 1
1.4.2 Other instructions and symbols .......................................................................... 2
2Technical Specification
2.1 Nameplate ........................................................................................................................ 3
2.2 Options ............................................................................................................................. 3
2.3 Weight .............................................................................................................................. 3
2.4 Temperature ..................................................................................................................... 4
2.5 Ambient conditions ........................................................................................................... 4
2.6 Ventilation ........................................................................................................................ 5
2.7 Pressure ........................................................................................................................... 5
2.8 Free air delivery ............................................................................................................... 6
2.9 Cooling Oil Recommendation .......................................................................................... 6
2.10 Cooling oil charge ............................................................................................................ 7
2.11 Motors and power ............................................................................................................ 7
2.11.1 Drive motor ......................................................................................................... 7
2.12 Sound pressure level ....................................................................................................... 8
2.13 Power supply .................................................................................................................... 9
2.14 Power supply specifications ............................................................................................. 9
2.14.1 Mains frequency: 50 Hz ...................................................................................... 9
2.14.2 Mains frequency: 60 Hz ...................................................................................... 11
3 Safety and Responsibility
3.1 Basic Information ............................................................................................................. 12
3.2 Specified Use ................................................................................................................... 12
3.3 Improper Use ................................................................................................................... 12
3.4 User's Responsibilities ..................................................................................................... 12
3.4.1 Observe statutory and universally accepted regulations .................................... 12
3.4.2 Qualified personnel ............................................................................................. 13
3.4.3 Adherence to inspection schedules and accident prevention regulations .......... 13
3.5 Dangers ............................................................................................................................ 14
3.5.1 Safely Dealing with Sources of Danger .............................................................. 14
3.5.2 Safe Machine Operation ..................................................................................... 16
3.5.3 Organisational Measures .................................................................................... 17
3.5.4 Danger Areas ...................................................................................................... 17
3.6 Safety Devices ................................................................................................................. 17
3.7 Safety Signs ..................................................................................................................... 18
3.8 Emergencies .................................................................................................................... 19
3.8.1 Correct fire fighting ............................................................................................. 19
3.8.2 Remove any cooling oil from your person .......................................................... 19
3.9 Warranty ........................................................................................................................... 19
3.10 Environmental Protection ................................................................................................. 20
4 Design and Function
4.1 Enclosure ......................................................................................................................... 21
4.2 Function ........................................................................................................................... 22
4.3 Floating relay contacts ..................................................................................................... 22
4.4 Remote LOAD-IDLE control ............................................................................................. 23
4.5 Options ............................................................................................................................. 23
4.5.1 Machine mountings ............................................................................................. 23
4.6 Operating modes and control modes ............................................................................... 24
Contents
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4.6.1 Operating modes ................................................................................................ 24
4.6.2 Control modes .................................................................................................... 24
4.7 Safety Devices ................................................................................................................. 25
4.8 SIGMA CONTROL BASIC Keys and Indicators ............................................................... 26
4.9 SIGMA CONTROL BASIC function .................................................................................. 27
4.9.1 Display layout ..................................................................................................... 27
4.9.2 Parameter ........................................................................................................... 27
4.9.3 Messages ........................................................................................................... 29
5 Installation and Operating Conditions
5.1 Safety ............................................................................................................................... 30
5.2 Installation conditions ....................................................................................................... 30
5.2.1 Determining location and clearances .................................................................. 30
5.2.2 Ensure adequate ventilation. .............................................................................. 31
5.2.3 Exhaust duct design ........................................................................................... 31
5.3 Operating the Machine in an Air System. ......................................................................... 32
6 Installation
6.1 Safety ............................................................................................................................... 33
6.2 Reporting Transport Damage ........................................................................................... 33
6.3 Making the Compressed Air Connection .......................................................................... 33
6.4 Making the Power Supply Connection ............................................................................. 34
6.5 Connecting the remote contact LOAD-IDLE control ........................................................ 35
6.6 Options ............................................................................................................................. 35
6.6.1 Anchoring the machine ....................................................................................... 35
7 Initial Start-up
7.1 Safety ............................................................................................................................... 36
7.2 Instructions to be Observed before before Every Start-Up .............................................. 36
7.3 Checking installation and operating conditions ................................................................ 37
7.4 Setting the overload protection cut-out ............................................................................ 38
7.5 Filling cooling oil into the airend ....................................................................................... 38
7.6 Checking direction of rotation ........................................................................................... 39
7.7 Starting the machine for the first time .............................................................................. 39
7.8 Checking the Door Interlock Switch ................................................................................. 40
7.9 Setting the setpoint pressure ........................................................................................... 41
8 Operation
8.1 Switching on and off ......................................................................................................... 42
8.1.1 Switching on ....................................................................................................... 42
8.1.2 Switching off ....................................................................................................... 42
8.2 Switching Off in an Emergency and Switching On again ................................................. 43
8.3 Acknowledging alarm and warning messages ................................................................. 44
8.4 Setting parameters ........................................................................................................... 44
9 Fault Recognition and Rectification
9.1 Basic Information ............................................................................................................. 46
9.2 Alarm messages (machine stop) ...................................................................................... 46
9.3 Warning messages .......................................................................................................... 47
9.4 Other Faults ..................................................................................................................... 48
10 Maintenance
10.1 Safety ............................................................................................................................... 49
10.2 Maintenance Schedule ..................................................................................................... 50
10.2.1 Logging Maintenance Work ................................................................................ 50
10.2.2 Resetting maintenance interval counters ............................................................ 50
10.2.3 Regular maintenance tasks ................................................................................ 50
Contents
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10.2.4 Cooling Oil: Change Interval ............................................................................... 51
10.2.5 Regular service tasks ......................................................................................... 52
10.3 Cooler: Cleaning or Renewing the Filter Mats ................................................................. 52
10.4 Cleaning or Replacing the Control Cabinet Filter Mats .................................................... 53
10.5 Cooler Maintenance ......................................................................................................... 54
10.6 Air Filter Maintenance ...................................................................................................... 55
10.7 Drive Motor Maintenance ................................................................................................. 56
10.8 Maintaining the drive belts ............................................................................................... 56
10.9 Checking the cooling oil level ........................................................................................... 57
10.10 Pressure relief valve checking ......................................................................................... 58
10.11 Checking the Excess Temperature Safety Shutdown Function ....................................... 59
10.12 Venting the Machine (depressurizing) .............................................................................. 59
10.13 Topping up the Cooling Oil ............................................................................................... 61
10.13.1 Venting the machine (depressurizing) ................................................................ 62
10.13.2 Topping up with cooling oil and trial run ............................................................. 63
10.14 Changing the cooling oil ................................................................................................... 64
10.15 Changing the oil filter ....................................................................................................... 66
10.16 Changing the oil separator cartridge ................................................................................ 67
10.17 Document maintenance and service work. ...................................................................... 69
11 Spares, Operating Materials, Service
11.1 Note the Nameplate ......................................................................................................... 70
11.2 Ordering consumable parts and operating materials ....................................................... 70
11.3 KAESER AIR SERVICE .................................................................................................. 70
11.4 Service Addresses ........................................................................................................... 71
11.5 Spare Parts for Service and Repair ................................................................................. 71
12 Decommissioning, Storage and Transport
12.1 Putting Out of Operation .................................................................................................. 74
12.2 Packing ............................................................................................................................ 74
12.3 Storage ............................................................................................................................. 74
12.4 Transporting ..................................................................................................................... 75
12.4.1 Safety .................................................................................................................. 75
12.4.2 Transporting with a forklift truck .......................................................................... 75
12.4.3 Transporting with a crane ................................................................................... 75
12.5 Disposal ........................................................................................................................... 76
13 Annex
13.1 Pipeline and instrument flow diagram (P+I diagram) ....................................................... 77
13.2 Pipe and Instrument Flow Diagram (P&I diagram): MODULATING control mode ........... 83
13.3 Dimensional Drawing ....................................................................................................... 89
13.4 Electrical Diagram ............................................................................................................ 92
Contents
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Contents
iv Service Manual Screw Compressor
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Fig. 1 Maximum relative humidity ......................................................................................................... 5
Fig. 2 Location of safety signs .............................................................................................................. 18
Fig. 3 Enclosure overview .................................................................................................................... 21
Fig. 4 Machine layout ........................................................................................................................... 22
Fig. 5 Machine mountings .................................................................................................................... 23
Fig. 6 Keys ........................................................................................................................................... 26
Fig. 7 Indicators .................................................................................................................................... 26
Fig. 8 Recommended machine placement and dimensions [mm] ........................................................ 31
Fig. 9 Compressed air connection ........................................................................................................ 34
Fig. 10 Connections to SIGMA CONTROL BASIC ............................................................................... 35
Fig. 11 Inlet valve filling port ................................................................................................................... 39
Fig. 12 Location of the interlock switch .................................................................................................. 40
Fig. 13 Switching on and off ................................................................................................................... 42
Fig. 14 Switching off in an emergency ................................................................................................... 43
Fig. 15 Acknowledging messages .......................................................................................................... 44
Fig. 16 Filter mat for the air and oil cooler .............................................................................................. 53
Fig. 17 Control cabinet ventilation grill ................................................................................................... 54
Fig. 18 Filter mat for the air and oil cooler .............................................................................................. 55
Fig. 19 Air filter maintenance .................................................................................................................. 56
Fig. 20 Changing the belt ....................................................................................................................... 57
Fig. 21 Checking the cooling oil level ..................................................................................................... 58
Fig. 22 Venting the machine ................................................................................................................... 60
Fig. 23 Topping up the Cooling Oil ......................................................................................................... 62
Fig. 24 Changing the cooling oil, oil separator tank ............................................................................... 64
Fig. 25 Changing the cooling oil, oil cooler ............................................................................................. 65
Fig. 26 Changing the oil filter .................................................................................................................. 67
Fig. 27 Changing the oil separator cartridge .......................................................................................... 68
Fig. 28 Transporting with a forklift truck ................................................................................................. 75
Fig. 29 Transporting with a crane ........................................................................................................... 76
List of Illustrations
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List of Illustrations
vi Service Manual Screw Compressor
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Tab. 1 The levels of danger and their meaning ..................................................................................... 2
Tab. 2 Nameplate .................................................................................................................................. 3
Tab. 3 Options ....................................................................................................................................... 3
Tab. 4 Machine weight .......................................................................................................................... 4
Tab. 5 Temperature ............................................................................................................................... 4
Tab. 6 Ambient conditions ..................................................................................................................... 4
Tab. 7 Ventilation (50Hz) ....................................................................................................................... 5
Tab. 8 Ventilation (60Hz) ....................................................................................................................... 5
Tab. 9 Pressure relief valve activating pressure (50 Hz) ....................................................................... 6
Tab. 10 Pressure relief valve activating pressure (60Hz) ........................................................................ 6
Tab. 11 FAD (50 Hz) ............................................................................................................................... 6
Tab. 12 FAD (60 Hz) ............................................................................................................................... 6
Tab. 13 Cooling Oil Recommendation ..................................................................................................... 7
Tab. 14 Cooling oil charge ....................................................................................................................... 7
Tab. 15 Drive motor ................................................................................................................................. 7
Tab. 16 Drive motor rated speed (50 Hz) ................................................................................................ 8
Tab. 17 Drive motor rated speed (60Hz) ................................................................................................. 8
Tab. 18 Sound pressure level .................................................................................................................. 8
Tab. 19 Mains supply 200V/3/50Hz ......................................................................................................... 9
Tab. 20 Mains supply 230V/3/50Hz ......................................................................................................... 10
Tab. 21 Mains supply 400V/3/50Hz ......................................................................................................... 10
Tab. 22 Supply conditions at 400V/3/50Hz ............................................................................................. 10
Tab. 23 Mains supply 230V/3/60Hz ......................................................................................................... 11
Tab. 24 Mains supply 380V/3/60Hz ......................................................................................................... 11
Tab. 25 Mains supply 440V/3/60Hz ......................................................................................................... 11
Tab. 26 Mains supply 460V/3/60Hz ......................................................................................................... 11
Tab. 27 Inspection intervals according to Ordinance on Industrial Safety and Health ............................ 14
Tab. 28 Danger Areas ............................................................................................................................. 17
Tab. 29 Safety Signs ............................................................................................................................... 18
Tab. 30 Energy-efficient control modes ................................................................................................... 24
Tab. 31 Operating modes under MODULATING control ......................................................................... 25
Tab. 32 Keys ........................................................................................................................................... 26
Tab. 33 Indicators .................................................................................................................................... 27
Tab. 34 Display ........................................................................................................................................ 27
Tab. 35 Parameter ................................................................................................................................... 27
Tab. 36 Initial start-up after storage ......................................................................................................... 37
Tab. 37 Installation conditions checklist .................................................................................................. 37
Tab. 38 Switching off with/without run-on time. ....................................................................................... 43
Tab. 39 Alarm indications ........................................................................................................................ 46
Tab. 40 Warning messages ..................................................................................................................... 47
Tab. 41 Other faults and actions ............................................................................................................. 48
Tab. 42 Regular maintenance tasks ........................................................................................................ 50
Tab. 43 Cooling oil changing intervals ..................................................................................................... 51
Tab. 44 Regular service tasks ................................................................................................................. 52
Tab. 45 Permissible cooling oil level under LOAD ................................................................................. 57
Tab. 46 Logged maintenance tasks ........................................................................................................ 69
Tab. 47 Consumable parts ...................................................................................................................... 70
List of Tables
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List of Tables
viii Service Manual Screw Compressor
SX SIGMA CONTROL BASIC 9_6919 04 E

1 Regarding this document
1.1 Using the Document
The service manual is part of the machine. It describes the machine as it was at the time of first
delivery after manufacture.
➤ Keep the service manual in a safe place throughout the life of the machine.
➤ Pass the manual on to the next owner/user of the machine.
➤ Ensure that all amendments received are entered in the manual.
➤ Enter details from the machine nameplate and individual items of equipment in the table in chap‐
ter 2.
1.2 Further documents
Further documents included with this operating manual are:
■ Certificate of acceptance / operating instructions for the pressure vessel
■ One of the following declarations of compliance, according to the applicable directive:
─ Declaration of Conformity
─ Manufacturer’s Declaration
─ Installation declaration
Missing documents can be requested from KAESER.
➤ Make sure all documents are complete and observe the instructions contained in them.
➤ Make sure you provide the data from the nameplate when ordering documents.
1.3 Copyright
This service manual is copyright protected. Queries regarding use or duplication of the documentation
should be referred to KAESER. Correct use of information will be fully supported.
1.4 Symbols and Identification
1.4.1 Warnings
Warning notices indicate three levels of danger signified by the signal word.
■ DANGER
■ WARNING
■ CAUTION
DANGER
These show the kind of danger and its source!
The possible consequences of ignoring a warning are shown here.
The word "Danger" indicates that death or severe injury can result from ignoring the instruction.
➤ The measures required to protect yourself from danger are shown here.
1 Regarding this document
1.1 Using the Document
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SX SIGMA CONTROL BASIC 1

➤ Always read and comply with warning instructions.
Signal word Meaning Consequences of non-observance
DANGER Warns of an imminent threat of danger Death or serious injury may result
WARNING Warns of possible danger Death or serious injury are possible
CAUTION Warns of a possibly dangerous situa‐
tion
Light injuries or material damage are possible
Tab. 1 The levels of danger and their meaning
1.4.2 Other instructions and symbols
This symbol refers to particularly important information.
Material Here you will find details on special tools, operating materials or spare parts.
Precondition Here you will find conditional requirements necessary to carry out the task.
Here conditions relevant to safety are named that will help you to avoid dangerous situations.
➤ This bullet is is placed by lists of actions comprising one stage of a task.
In lists of actions with several stages the sequence of actions is numbered.
Information that refers to only one option is marked with an indicator (e.g.: H1 means that this
section is only valid for machines with adjustable machine mountings). Option indicators used in
this service manual are explained in chapter 2.2 .
Information referring to potential problems are identified by a question mark.
The cause is named in the help text ...
➤ ... and a remedy given.
This symbol refers to important information or measures concerning environmental protection.
Further information Here, your attention is drawn to further topics.
1 Regarding this document
1.4 Symbols and Identification
2Service Manual Screw Compressor
SX SIGMA CONTROL BASIC 9_6919 04 E
Option H1

2 Technical Specification
2.1 Nameplate
The machine's nameplate provides the model designation and important technical information.
The nameplate is located on the outside of the machine:
■ above the cooler,
or
■ on the rear of the machine.
➤ Enter here the nameplate data as a reference:
Feature Value
Rotary Screw Compressor
Part No.
Serial No.
Year of manufacture
Rated power
Rated motor speed
Maximum working pressure
Ambient temperature
Tab. 2 Nameplate
2.2 Options
The table contains a list of possible options.
➤ Enter options here as a reference.
Option Option code Exists?
Modulating control C1
Direct online starting C17
Adjustable machine feet H1
Air cooling K1
Transformer power supply for refrigeration dryer T2
Refrigeration dryer T3
Tab. 3 Options
2.3 Weight
The weight given is the maximum. The actual weights of individual machines are dependent on
equipment fitted.
2 Technical Specification
2.1 Nameplate
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SX 3 SX 4 SX 6 SX 8
Weight [kg] 140 140 145 155
Tab. 4 Machine weight
2.4 Temperature
SX 3 SX 4 SX 6 SX 8
Minimum cut-in tempera‐
ture [°C]
3 3 3 3
Typical airend discharge
temperature during opera‐
tion [°C]
65–100 65–100 65–100 65–100
Maximum airend dis‐
charge temperature (auto‐
matic safety shut-down)
[°C]
110 110 110 110
Tab. 5 Temperature
2.5 Ambient conditions
SX 3 SX 4 SX 6 SX 8
Maximum altitude AMSL*
[m]
1000 1000 1000 1000
Permissible ambient tem‐
perature [°C]
3–45 3–45 3–45 3–45
Cooling air temperature
[°C]
3–45 3–45 3–45 3–45
Inlet air temperature [°C] 3–45 3–45 3–45 3–45
Maximum relative humidi‐
ty of inlet air
see figure 1 see figure 1 see figure 1 see figure 1
* Higher altitudes are permissible only after consultation with the manufacturer.
Tab. 6 Ambient conditions
2 Technical Specification
2.4 Temperature
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SX SIGMA CONTROL BASIC 9_6919 04 E

Fig. 1 Maximum relative humidity
TInlet air temperature [°C]
HMaximum relative humidity of inlet air [%]
2.6 Ventilation
The values given are minimum guide values.
Mains frequency: 50 Hz
SX 3 SX 4 SX 6 SX 8
Inlet aperture Z see fig‐
ure 8 [m2]
0.2 0.2 0.2 0.2
Exhaust fan for forced
ventilation:
Flow rate [m3/h] at 100 Pa.
1000 1200 1500 2000
Tab. 7 Ventilation (50Hz)
Mains frequency: 60 Hz
SX 3 SX 4 SX 6 SX 8
Inlet aperture Z see fig‐
ure 8 [m2]
0.2 0.2 0.2 0.2
Extractor for forced venti‐
lation:
Flow rate [m3/h] at 100 Pa
1000 1200 1500 2000
Tab. 8 Ventilation (60Hz)
2.7 Pressure
Maximum working pressure: see nameplate
2 Technical Specification
2.6 Ventilation
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Pressure relief valve activating pressure at 50 Hz [bar]
Maximum working pres‐
sure [bar]
SX 3 SX 4 SX 6 SX 8
8 10 10 10 10
11 13 13 13 13
15 — 16 16 16
Tab. 9 Pressure relief valve activating pressure (50 Hz)
Pressure relief valve activating pressure at 60 Hz [bar]
Maximum working pres‐
sure [bar]
SX 3 SX 4 SX 6 SX 8
8.5 10 10 10 10
11 13 13 13 13
15 — 16 16 16
Tab. 10 Pressure relief valve activating pressure (60Hz)
2.8 Free air delivery
FAD [m3/min] at 50 Hz
Maximum working pres‐
sure [bar]
SX 3 SX 4 SX 6 SX 8
8 0.34 0.45 0.60 0.80
11 0.26 0.36 0.48 0.67
15 — 0.25 0.36 0.53
Tab. 11 FAD (50 Hz)
FAD [m3/min] at 60 Hz
Maximum working pres‐
sure [bar]
SX 3 SX 4 SX 6 SX 8
8.5 0.34 0.45 0.60 0.80
11 0.26 0.36 0.48 0.67
15 — 0.25 0.36 0.53
Tab. 12 FAD (60 Hz)
2.9 Cooling Oil Recommendation
A sticker showing the type of oil used is located near the oil separator tank filler.
Information on ordering cooling oil is found in chapter 11.
2 Technical Specification
2.8 Free air delivery
6Service Manual Screw Compressor
SX SIGMA CONTROL BASIC 9_6919 04 E

SIGMA FLUID
S–460 MOL FG–460/FG–680
Description Silicone-free
synthetic oil
Mineral oil Synthetic oil
Application Standard oil for all applica‐
tions except in connection
with foodstuffs.
Particularly suitable for ma‐
chines with a high duty cy‐
cle.
Standard oil for all ap‐
plications except in
connection with food‐
stuffs.
Particularly suitable for
machines with a low
duty cycle.
Specifically for applications
where the compressed air
comes into contact with food‐
stuffs.
Approval — — USDA H–1, NSF
Approved for the manufacture
of foodstuff packaging, meat
and poultry processing and
other food processing.
Viscosity at
40 °C
45 mm2/s
(D 445; ASTM Test)
44 mm2/s
(DIN 51562–1)
50.7/70.0 mm2/s
(D 445; ASTM Test)
Viscosity at
100 °C
7.2 mm2/s
(D 445; ASTM Test)
6.8 mm2/s
(DIN 51562–1)
8.2/710.4 mm2/s
(D 445; ASTM Test)
Flash point 238 °C
(D 92; ASTM Test)
220 °C
(ISO 2592)
245 °C
(D 92; ASTM Test)
Density at
15 °C
864 kg/m3
(ISO 12185)
— —
Pour point −46 °C
(D 97; ASTM Test)
−33 °C
(ISO 3016)
—
Demulsibility
at 54 °C
40/40/0/10 min
(D 1401; ASTM Test)
— —
Tab. 13 Cooling Oil Recommendation
2.10 Cooling oil charge
SX 3 SX 4 SX 6 SX 8
Total charge [l] 2.8 2.8 2.8 2.8
Topping up volume [l]
(minimum–maximum)
0.12 0.12 0.12 0.12
Tab. 14 Cooling oil charge
2.11 Motors and power
2.11.1 Drive motor
SX 3 SX 4 SX 6 SX 8
Rated power [kW] 2.2 3.0 4.0 5.5
2 Technical Specification
2.10 Cooling oil charge
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SX 3 SX 4 SX 6 SX 8
Enclosure protection IP 54 IP 54 IP 54 IP 54
Tab. 15 Drive motor
Rated speed at 50 Hz [rpm]
Maximum working pres‐
sure [bar]
SX 3 SX 4 SX 6 SX 8
8 2910 2910 2910 2930
11 2910 2910 2910 2930
15 — 2910 2910 2930
Tab. 16 Drive motor rated speed (50 Hz)
Rated speed at 60 Hz [rpm]
Maximum working pres‐
sure [bar]
SX 3 SX 4 SX 6 SX 8
8.5 3490 3520 3520 3540
11 3490 3520 3520 3540
15 — 3520 3520 3540
Tab. 17 Drive motor rated speed (60Hz)
2.12 Sound pressure level
Operational state
■ Nominal volume flow
■ Nominal pressure
Measurement conditions
■ Free-field measurement to CAGI/PNEUROP PN8 NTC 2.3
■ Measurement distance: 1 m
Sound pressure lev‐
el [dB(A)]
SX 3 SX 4 SX 6 SX 8
At 50 Hz 60 61 62 64
At 60 Hz 62 63 64 66
Tab. 18 Sound pressure level
2 Technical Specification
2.12 Sound pressure level
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2.13 Power supply
Basic requirements
The machine is designed for a power supply conforming to EN 60204–1 (IEC 60204–1), section 4.3.
In the absence of other user-specified conditions, the limits laid down in this standard must be adhered
to.
It is recommended that the supplier and user confer and agree on the basis of the EN 60240–1, Annex
B.
The machine requires a symmetrical three-phase power supply.
In a symmetrical three-phase supply the phase angles and voltages are all the same.
The machine may only be operated from an earthed TN or TT three-phase supply.
Connection to an IT supply is not permitted without taking further measures (earth leak detection,
etc.).
Further requirements
Demands on a three-phase supply for a machine with the following equipment:
■ Variable frequency drive (SFC)
■ Refrigeration dryer powered from a transformer
This machine may only be supplied from an earthed TN or TT three-phase supply in which the neutral
point is earthed.
The machine may not be connected to a three-phase supply in which one of the phases is earthed,
as this can lead to dangerous voltage surges.
Connection to an IT supply is not permitted without further measures being taken (earth leak detection,
specially designed frequency converter, etc.).
Further information The electrical diagram in chapter 13.4 contains further details of the power supply connection.
2.14 Power supply specifications
The following supply cable conductor cross sections (copper multicore) and fusing (slow-blow
class gL) are selected according to German DIN VDE 0100–430 (IEC 60364–4–43 and
IEC 60364–4–473) and DIN VDE 0298-4 standards for 30 °C ambient temperature and wiring
type C.
➤ The conductor cross-sections should be changed accordingly if other conditions prevail.
Other conditions would include, for example:
■ higher temperature
■ other cable laying method
■ cable lengths >50 m
2.14.1 Mains frequency: 50 Hz
Rated power supply 200V±10%/3/50Hz
SX 3 SX 4 SX 6 SX 8
Mains fusing [A] 20 16 20 35
Supply cable [mm2]4x2.5 4x2.5 4x2.5 4x6.0
2 Technical Specification
2.13 Power supply
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SX 3 SX 4 SX 6 SX 8
Current drawn [A] 10 13 16 22
Tab. 19 Mains supply 200V/3/50Hz
Rated power supply: 230V±10%/3/50Hz
SX 3 SX 4 SX 6 SX 8
Mains fusing [A] 20 16 20 25
Supply cable [mm2]4x2.5 4x2.5 4x2.5 4x4.0
Current drawn [A] 9 13 16 24
Tab. 20 Mains supply 230V/3/50Hz
Rated power supply: 400V±10%/3/50Hz
SX 3 SX 4 SX 6 SX 8
Mains fusing [A] 16 10 16 16
Supply cable [mm2]4x2.5 4x1.5 4x2.5 4x2.5
Current drawn [A] 5 6 8 11
Tab. 21 Mains supply 400V/3/50Hz
2.14.1.1 Network conditions
The network conditions apply to machines connected to public mains supplies with the following
characteristics.
■ Frequency: 50 Hz
■ Voltage between exterior and neutral lines 220 V...250 V
■ Voltage between the exterior lines 380 V...440 V
They do not apply to private power supplies within industrial areas isolated from the public mains.
Machines with current consumption >16 A...≤75 A comply fully with IEC 61000–3–12.
The machines listed in table are intended for operation with a public power supply with a network
impedance at the transfer point (house connection) of maximum Zmax [Ohm].
The operator must ensure that the machines are only connected to a network that meets these re‐
quirements. If necessary, ask the local electricity company for the value of the network impedance.
SX 3 SX 4 SX 6 SX 8
Anticipated number of
start-stop cycles per hour
15 15 15 15
Highest permissible sys‐
tem impedance*
Zmax [Ohm]
0.16 0.39 0.23 0.18
*Specification related to the sum of impedences in exterior and neutral liner.
Tab. 22 Supply conditions at 400V/3/50Hz
2 Technical Specification
2.14 Power supply specifications
10 Service Manual Screw Compressor
SX SIGMA CONTROL BASIC 9_6919 04 E