KAESER KOMPRESSOREN SX, Service Manual, Page: 19 / 122

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 [mm
2
] 4x2.5 4x2.5 4x2.5 4x6.0
2 Technical Specification
2.13 Power supply
9_6919 04 E
Service Manual Screw Compressor
SX SIGMA CONTROL BASIC
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