Siemens SIMOTICS T-1FW68, Configuration Manual

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Mechanical properties
3.1 Cooling
1FW68 radial segment motors
Configuration Manual, 08/2021, A5E51132930B AA
53
The rated motor data refer to operation at a coolant intake temperature of 35 ° C. If the
intake 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 than I
0
.
I
0
is the current (rms value) of the stator segment for torque M
0
and speed n = 1 r/min.
Larger cable cross-sections may be required. This means that you must take into
account the rated current of the cables.
The following diagram shows the dependency of the relative continuous stator segment
current (I
Statorsegment
/ I
N
) * 100 on the water intake temperature into the cooling system.
The rotor segment losses are neglected in this case.
Figure 3-2 Influence of the coolant intake temperature
Heat-exchanger unit
Use a cooling system to ensure an intake temperature of 35 ° C. Several stator segments
can be connected to a cooling system (heat exchanger). The heat-exchanger units are
not included in the scope of delivery.
The cooling power is calculated from the sum of the power losses of the connected
stator segments. Adapt the pump power to the specified flow and pressure loss of the
cooling circuit.
For a list of companies from whom you can obtain heat exchanger units, see the
appendix.