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The machine requires a symmetrical three-phase power supply transformer with a WYE configura‐
tion output as shown in Figure 1 and Figure 2. In a symmetrical three phase supply the phase an‐
gles and voltages are all the same.
Other power supplies are not suitable.
Fig. 1 Three-phase star (wye); 4 wire; center point solidly grounded
Fig. 2 Three-phase star (wye); 3 wire; center point solidly grounded
Further information Please contact an authorized KAESER service representative for options.
The electrical diagram 13.5 contains further specifications for electrical connection.
2.13 Power supply specifications
The following multi-strand copper core wires are given according to 2017 NEC 310.1, Table
310.15(B)(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 2017 NEC 110.14(C), 220.3, 310.15, Table 310.15(B)(2)(a),
430.6,430.22, 430.24, 670.4(A) and other local codes.
Dual element time delay fuses are selected according to 2017 NEC 240.6 , 430.52 and tables
430.52, 430.248 and 430.250.
We strongly suggest using a separate copper conductor for the equipment GROUNDING. 2017
NEC Table 250.122 will point out the “minimum size”, however, we recommend a ground conduc‐
tor the same size as the power leads, if local codes allow.
2.14 Options
Technical data for the options available for your machine are given in the following.
2.14.1 Option C5
Oil level monitoring
Feature
Data
Max. voltage [V]
250
Switching current [A]
0.5
Switching capacity [hp]
0.03
Type of contact
Normally closed
2
Technical Data
2.13 Power supply specifications
Number: 9_9572 28 USE
Installation and Operating Manual Rotary lobe blower
HBPI pr
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