50
60
70
80
90
100
[%]
P2
1
2
3
20 25 30 35 40 45 50 55 60 65 70 75 80
t[ °C ]
1000
2250 3500 4750 m
TM044914
Motor output (P2) in relation to ambient temperature
and altitude
Curve
Motor power
[kW]
Motor make
Motor effi-
ciency class
1 0.06 - 0.18 Siemens IE3
1 0.25 - 0.55 Grundfos MG IE3
2 0.75 - 22 Grundfos MG IE3
3 30-45 Siemens IE3
Example of maximum motor load
Pump with a 2.2 kW IE3 motor (derating curve 2):
• If this pump is installed 4750 m above sea level,
the motor must not be loaded more than 88 % of
the rated output.
• At an ambient temperature of 75 °C, the motor
must not be loaded more than 78 % of the rated
output.
• If the pump is installed 4750 m above sea level at
an ambient temperature of 75 °C, multiply the
derating factors. The motor must not be loaded
more than 88 % × 78 % = 68.6 % of the rated
output.
If the motor load is not reduced in case the
ambient temperature or installation altitude
is exceeded, the motor life will be limited,
and the warranty is void.
11.1.5 Maximum number of starts
Motor power
[kW]
Recommended maximum num-
ber of starts per hour
0.06 - 0.18 100
0.25 - 2.2 250
3-4 100
5.5 - 11 50
15-22 40
30-45 8
11.1.6 Sound pressure level
The table below shows airborne noise emitted by
pumps with motors fitted by Grundfos.
50 Hz
ISO 3743-2 / ISO
1680
60 Hz
ISO 3743-2 / ISO
1680
Motor power
[kW]
L
pA
[dB(A)]
L
pA
[dB(A)]
0.37 50 55
0.55 50 53
0.75 50 54
1.1 52 57
1.5 54 59
2.2 54 59
3.0 55 60
4.0 62 66
5.5 60 65
7.5 60 65
11 60 65
15 60 65
18.5 60 65
22 66 70
30 67 75
37 67 75
45 67.5 75
11.2 Electrical data
See the motor nameplate.
22
English (GB)
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