Siemens SIMOTICS M-1PH8 - Page 80

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 di󹪜erence 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 di󹪜erence of 10K:
T
cool
>T
ambient
–temperature di󹪜erence
Please note that you must also shut o󹪜 the 󹪞ow 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 speci󹪝ed 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 Derating factors
Installation altitude above sea level
m
Cooling water inlet temperature
≤ 30°C 35°C 40°C 45°C
1000 1.00 0.95 0.90 0.84
1500 0.97 0.92 0.87 0.81
2000 0.93 0.88 0.84 0.78
2500 0.91 0.86 0.82 0.76
3000 0.89 0.85 0.80 0.75
3500 0.87 0.83 0.78 0.73
4000 0.85 0.81 0.77 0.71
Cooling data and sound pressure levels
The speci󹪝ed values refer to operation at the rated speed with rated torque. The cooling water
temperature must be ≤30° C.
Table 4-11 Cooling data and sound pressure levels
Shaft height Flow
rate, min.
l/min
Pressure drop
bar
Sound pressure level L
pA
(1 m)
Motor rated load,
tolerance +3 dB
dB
Thread con‐
nection at
NDE
Inch
80 6 0.6 68
1)
G 1/8
100 8 0.4 G 1/4
132 12 0.9 G 3/8
160 15 0.2 69
1)
G1/2
Mechanical properties
4.1Cooling
1PH8 SIMOTICS M main motors
78 Con󹪝guration Manual, 12/2022, A5E51895839A