Siemens SIMOTICS T-1FW3, Configuration Manual

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Mechanical properties
3.1 Cooling
1FW3 complete torque motors
42
Configuration Manual, 08/2020, A5E46027705B AA
Cooling water inlet temperature
Note
Avoid condensation
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 must therefore not exceed a maximum of 5 K (Kelvin).
• Select the cooling water inlet temperature such that condensation does not form on the
surface of the motor: T
cooling
> T
ambient
- 5 K.
•
Additionally shut off the coolant supply if the motor is to remain at a standstill for a long
time.
Lowering the inlet temperature of the cooling water by 5 K relative to the ambient
temperature permits a relative humidity up to approx. 75% for the temperatures in the
"Derating factors" table below. Condensation does not occur. You will find deviations from
these values in the Mollier diagram.
• If the relative humidity is higher than 75%, you will have to further increase the inlet
temperature of the cooling water.
•
If the actual relative humidity is lower than 75%, you can further decrease the inlet
temperature of the cooling water.
The motors are designed for operation up to a cooling water inlet temperature of +30° C, as
long as all of the specified motor data is maintained. For higher cooling water inlet
temperatures, you must maintain a derating referred to the static torque M
0
. After derating,
you shift the S1 characteristic to the new base point of static torque M
0
, see table "Derating
factors".
Table 3- 3 Derating factors
Cooling water inlet temperature ≤ 30 °C 35 °C 40 °C 45 °C
Derating factor 1.00 0.97 0.95 0.92
Note
Cooling water inlet temperatures > 45 °C
Contact your local Siemens office for cooling water inlet temperatures > 45 °C.
The following data are required to answer your inquiry about derating due to increased
ambient temperatures:
•
Ambient temperature in °C
•
Absolute air humidity in g/m³ or relative air humidity in %
• Shaft temperature of the driven machine in °C