Grundfos LS Series User Manual

English (GB)
28
9. Technical data
9.1 Operating conditions
9.1.1 Ambient temperature and altitude
The ambient temperature and the installation altitude
are important factors for the motor lifetime, as they
affect the life of the bearings and the insulation
system.
If the ambient temperature or the altitude exceeds
the recommended maximum ambient temperature or
maximum altitude above sea level, the motor must
not be fully loaded due to the low density and
consequently low cooling effect of the air. See fig.
23. In such cases, it may be necessary to use a
motor with a higher output.
Ambient temperature
Maximum motor output in relation to ambient
temperature and altitude
Fig. 23 Relationship between motor output (P2)
and ambient temperature
Example
Figure 23 shows that an MG IE3 motor must not be
loaded by more than 89 % of the rated output at an
ambient temperature of 70 °C. If the pump is
installed 4750 metres above sea level, the motor
must not be loaded by more than 89 % of the rated
output. In cases where both the maximum
temperature and the maximum altitude are
exceeded, the derating factors must be multiplied
(0.89 x 0.89 = 0.79).
9.1.2 Liquid temperature
The maximum liquid temperature marked on the
pump nameplate depends on the mechanical shaft
seal used:
Motor
make
Motor P2
Permissible ambient
temperature
MG
0.25 - 0.55 kW -20 - +40 °C
0.75 - 22 kW -20 - +60 °C
Siemens 0.75 - 462 kW -20 - +55 °C
MMG-H2 0.75 - 450 kW -20 - +60 °C
MMG-H3 0.75 - 200 kW -30 - +60 °C
MMG-G2 0.75 - 630 kW -20 - +60 °C
MMG-G3 0.75 - 315 kW -20 - +60 °C
Motor
make
Motor P2 Derating curve
MG
0.25 - 0.55 kW Fig. 23, curve 1
0.75 - 22 kW Fig. 23, curve 2
Siemens 0.75 - 462 kW Fig. 23, curve 3
MMG-H2 0.75 - 450 kW Fig. 23, curve 2
MMG-H3 0.75 - 200 kW Fig. 23, curve 2
MMG-G2 0.75 - 630 kW Fig. 23, curve 2
MMG-G3 0.75 - 315 kW Fig. 23, curve 2
TM04 4914 2209
Temperature range for NBR: 0-100 °C.
Temperature range for FKM: 15-100 °C.
20 25 30 35 40 45 50 55 60 65 70 75 80
50
60
70
80
90
100
[%]
P2
1
2
3
t[°C]
1000 2250 3500 4750 m

Grundfos LS Series Specifications

General

Brand	Grundfos
Model	LS Series
Category	Water Pump
Language	English