ASD 25 ASD 30 ASD 40S ASD 40
Sound pressure lev‐
el [dB (A)]
66 67 67 69
Tab. 17 Sound Pressure Level
2.13 Power Supply
Basic requirements
The machine is designed for an electrical supply according to National Electric Code (NEC) NEC–
670, particulary NFPA 79, edition 2007, section 4.3. In the absence of any user-specified alternatives,
the limits given in these standards must be adhered to. Consult manufacturer for any other specific
power supply.
Three-phase
Do NOT operate package on any unsymmetrical power supply. Also do NOT operate package on
power supplies like, for example, a three-phase (open) delta or three-phase star with non-grounded
neutral.
The machine requires a symmetrical three-phase power supply transformer with a WYE configuration
output as shown in Figure 2 and Figure 3. In a symmetrical three phase supply the phase angles and
voltages are all the same.
Other power supplies are not suitable.
Fig. 2 Three-phase star (wye); 4 wire; grounded neutral
Fig. 3 Three-phase star (wye); 3 wire; grounded neutral
Further information Please contact authorized KAESER Service representative for options.
The electrical diagram 13.4 contains further specifications for electrical connection.
2.14 Power Supply specifications
The following multi-strand copper core wires are given according to 2005 NEC 310.15, Table 310.16
for 40 °C ambient temperature.
If other local conditions prevail, like for example high temperature, the cross section should be
checked and adjusted according to 2005 NEC 110.14©, 220.3,310.15, Table 310.16, 430.6, 430.22,
430.24 and other local codes.
Dual element time delay fuses are selected according to 2005 NEC 240.6,430.52 and tables 430.52,
430.248 and 430–.250.
2 Technical Data
2.13 Power Supply
9_5721 06 USE
Service Manual Screw Compressor
ASD T Tri-Voltage
9
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