2.11 Motors and power
2.11.1 Compressor motor
SM 7.5 SM 10 SM 15
Rated power [hp] 7.5 10 15
Enclosure protection TEFC TEFC TEFC
Tab. 13 Compressor motor
Rated speed [rpm]:
Maximum working over‐
pressure [psig]
SM 7.5 SM 10 SM 15
125 3530 3535 3560
160 3530 3535 3560
217 3530 3535 3560
Tab. 14 Compressor motor: Rated speed
2.12 Noise emission
SM 7.5 SM 10 SM 15
Noise emission [dB(A)] 66 67 68
Sound pressure level as per ISO 2151 and the basic standard ISO 9614-2, tolerance: ±3 dB(A) at
maximum machine working pressure
Tab. 15 Noise emission
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 2014 , 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.
The incoming line within the control panel should be as short as possible.
If external sensors or communication lines are to be connected to the machine, use shielded ca‐
bles and insert the same through EMC fittings into the control panel.
Three-phase
Do NOT operate package on any unsymmetrical power supply. Also do NOT operate package on
power supplies such as a three-phase WYE system with the center point not solidly grounded or
three-phase (open) delta.
The machine requires a symmetrical three-phase power supply transformer with a WYE configura‐
tion output as shown in Figure 2 and Figure 3. In a symmetrical three phase supply the phase an‐
gles and voltages are all the same.
2 Technical Data
2.11 Motors and power
9_5875 33 USE
Operator Manual Screw Compressor
SM Tri-Voltage, SIGMA CONTROL 2
9
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