User's Manual
Motor components of the built-in motor and options
3.3 Cooling
Coolant intake temperature
The intake temperatures must be selected in such a way that no condensation forms on the
surface of the motor. Condensation can lead to corrosion in the machine.
T
kühl
≥ T
Umgeb
- 2 K
The motors are designed in accordance with DIN EN 60034–1 for operation at coolant
temperatures of up to 35°C (rated value of the coolant intake temperature). If the intake
temperature is different, the continuous motor current changes as shown below:
,QIOXHQFHRIFRRODQWLQOHWWHPSHUDWXUH
&RQWLQXRXVPRWRUFXUUHQWLQRI,1
,QOHWWHPSHUDWXUHRIWKHPDLQFRROHULQr&
Figure 3-3 Principal dependency of the continuous motor current on the intake temperature of water
cooling in the main cooler when the rotor losses are disregarded
Heat-exchanger unit
A heat-exchanger unit must be used to ensure a coolant inlet temperature of 35°C. More
than one motor can be operated on a single heat-exchanger unit. The heat-exchanger units
are not included in the scope of supply.
The cooling power is calculated from the sum of the power losses of the connected motors.
The pump power must be adjusted in accordance with the specified flow and pressure loss
of the cooling circuit.
For a list of companies and addresses from whom you can obtain heat-exchanger units, see
the appendix.
Dimensioning the heat-exchanger unit
The power loss generated in the motor during continuous operation causes a heat flow, most
of which is dissipated via the coolant in the cooling system. A smaller proportion of it is
dissipated via the surrounding machine construction. The cooling power of the heat-
exchanger unit in the cooling system must be designed in such a way that it can dissipate at
least 85 - 90% of the generated power loss. If several motors are operated simultaneously
on one cooling system, this value applies to the combined total power loss.
1FW6 Built-in torque motors
Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3
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