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Description
2.5 Design
Any danger areas encountered during normal operation and when maintaining and servicing
the motor must be identified using clearly visible warning and prohibit signs (pictograms) in
the immediate vicinity of the danger (close to the motor). The associated texts must be
available in the language of the country in which the product is used.
2.5.3
Cooling
The power loss generated by the stator winding must be dissipated. To achieve this, the
stator is equipped with cooling ribs to increase the overall surface area.
For natural cooling, the rated torque M
with respect to its surroundings. For instance, this is influenced by the following factors:
● thermal contact to the machine
● temperature difference to the environment
● flow velocity of the cooling air
● increased surface area as a result of the cooling ribs
When very unfavorably installed under certain circumstances, heat cannot be dissipated
through the peripheral motor surface. This can result in a reduction of the S1 characteristic.
In certain operating statuses (e.g. at high speeds or in S1 mode), the rotor temperature can
increase due to iron loss.
2.5.4
Temperature monitoring and thermal motor protection
2.5.4.1
Temperature monitoring circuits Temp-S and Temp-F
The motors are equipped with the two temperature monitoring circuits – Temp-S and Temp-F
– that are described below.
● Temp-S activates the thermal motor protection when the motor windings are thermally
overloaded. In this case the precondition is that Temp-S is correctly connected and
evaluated. For a thermal overload, the drive system must bring the motor into a no-
current condition.
● Temp-F is used for temperature monitoring and diagnostics during commissioning and in
operation.
Both temperature monitoring circuits are independent of one another.
For example, the SME12x sensor module or the TM120 terminal module evaluates the
temperature sensor signals.
You can obtain commissioning information from Technical Support. Contact data is provided
in the introduction.
38
depends on the thermal conductivity of the motor
N
Naturally cooled 1FW6 built-in torque motors
Operating Instructions, 07/2017, 6SN1197-0AF02-0BP2
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