Siemens SIMOTICS M 1PH8 Configuration Manual page 80

Mechanical properties
4.1 Cooling
Cooling water inlet temperature
Note
Cooling water inlet temperature
Select the cooling water inlet temperature so that condensation does not form on the surface
of the motor.
Cooling water temperatures which are lower than the ambient temperature tend to result in
increased water condensation. The difference between the cooling water inlet temperature and
the ambient temperature depends on the relative air humidity. For instance, 50 % air humidity
at an ambient temperature of 40 °C corresponds to a temperature difference of 10 K:
T > T
cool
Please note that you must also shut off the flow of cooling water when the motor is not
operational for prolonged periods of time.
The motors are designed for operation up to a cooling water inlet temperature of +30 °C,
provided that all of the specified motor data is complied with. If the cooling water inlet
temperature deviates from this, the continuous torque will change (see table "Derating
factors").
Table 4-10
Installation altitude above sea level
m
1000
1500
2000
2500
3000
3500
4000
Cooling data and sound pressure levels
The specified values refer to operation at the rated speed with rated torque. The cooling water
temperature must be ≤ 30° C.
Table 4-11
Shaft height
80
100
132
160
78
– temperature difference
ambient
Derating factors
Cooling data and sound pressure levels
Flow
rate, min.
l/min
6
8
12
15
Cooling water inlet temperature
≤ 30 °C 35 °C
1.00 0.95
0.97 0.92
0.93 0.88
0.91 0.86
0.89 0.85
0.87 0.83
0.85 0.81
Pressure drop Sound pressure level L
Motor rated load,
bar
tolerance +3 dB
dB
0.6 68 1)
0.4
0.9
0.2 69
1)
Configuration Manual, 12/2022, A5E51895839A
40 °C 45 °C
0.90 0.84
0.87 0.81
0.84 0.78
0.82 0.76
0.80 0.75
0.78 0.73
0.77 0.71
(1 m) Thread con‐
pA
nection at
NDE
Inch
G 1/8
G 1/4
G 3/8
G1/2
1PH8 SIMOTICS M main motors