Siemens SIMOTICS T-1FW6 - Page 58

Mechanical properties
3.1 Cooling
1FW6 Built-in torque motors
56 Configuration Manual, 07/2017, 6SN1197-0AE00-0BP9
Calculating the thermal power that can be dissipated by the cooler
Average density of the coolant:
ρ
in
kg/m
3
Average specific heat capacity of the coolant:
c
p
in
J/(kg K)
Temperature deviation vis-à-vis the intake temperature:
ΔT
in
K
Volume flow:
in
m
3
/s
Coolant inlet temperature
NOTICE
Corrosion in the machine
Condensation can lead to corrosion in the machine.
• Choose inlet temperatures that prevent condensation from forming on the surface of the
motor. Condensation does not occur if the intake temperature T
VORL
is higher than the
ambient temperature - or corresponds to the ambient temperature.
The rated motor data refer to operation at a coolant inlet temperature of 35 °C. If the inlet
temperature is different, the continuous motor current changes as shown below:
Note
For a cooler intake
temperature of < 35 °C, the possible continuous motor current is
greater
I
0
.
I
0
is the current (rms value) of the stator at torque M
0
and speed n = 1 rpm.
Larger cable cross
-sections may be required. This means that you must take into account
the rated cu
rrent of the cables.