The machines listed in the table are intended for operation with a public power supply with a net‐
work impedance at the transfer point (house connection) of maximum Z
max.
[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.
SK 22 SK 25 —
Anticipated number of
start-stop cycles per hour
15 15 —
Highest permissible
mains impedance*
Z
max.
[Ohm]
0.046 0.027 —
*Specification related to the sum of impedances in external and neutral lines.
Tab. 26 Network conditions at 400V / 3 / 50Hz
Machines with current consumption 16 A...≤75 A comply fully with IEC 61000-3-12.
2.14.2 Mains frequency: 60 Hz
Rated voltage: 230V / 3 / 60Hz
SK 22 SK 25 —
Backup fuse [A] 50 63 —
Supply cable [mm
2
]
4x10 4x16 —
Current drawn [A] 42 53 —
Tab. 27 Supply details 230V / 3 / 60Hz
Rated voltage: 380V / 3 / 60Hz
SK 22 SK 25 —
Backup fuse [A] 32 40 —
Supply cable [mm
2
]
4x6 4x6 —
Current drawn [A] 24 32 —
Tab. 28 Supply details 380V / 3 / 60Hz
Rated voltage: 440V / 3 / 60Hz
SK 22 SK 25 —
Backup fuse [A] 25 32 —
Supply cable [mm
2
]
4x4 4x6 —
Current drawn [A] 21 27 —
Tab. 29 Supply details 440V / 3 / 60Hz
2 Technical Specifications
2.14 Power supply specifications
901848 21 E
Operating Manual Rotary screw compressor
SK
13
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