Description
3.4 Design
Synchronous Motors 1FK7
16 Operating Instructions, 03/2011, 610.40700.40c
3.4.4 Ambient conditions
The following temperature ranges apply to naturally-cooled motors.
● Permissible temperature range in operation: T = -15 °C to +40 °C
● Permissible temperature range during storage: T = -20 °C to +70 °C
For deviating conditions (ambient temperature > 40°C or installation altitude > 1000 m
above sea level) the permissible torque/power must be determined from the following table.
Ambient temperatures and installation altitudes are rounded off to 5°C and 500 m
respectively.
Table 3- 4 Power derating as a function of the installation altitude and ambient temperature
Ambient temperature in °C
Installation altitude above
sea level [m]
< 30 30 - 40 45 50 55
1000 1.07 1.00 0.96 0.92 0.87
1500 1.04 0.97 0.93 0.89 0.84
2000 1.00 0.94 0.90 0.86 0.82
2500 0.96 0.90 0.86 0.83 0.78
3000 0.92 0.86 0.82 0.79 0.75
3500 0.88 0.82 0.79 0.75 0.71
4000 0.82 0.77 0.74 0.71 0.67
NOTICE
What has to be observed when installing the motors
1FK7 motors are not suitable for operation
in salt-laden or corrosive atmospheres
outdoors
3.4.5 Cooling
Natural cooling
The rated data only applies when the ambient temperature does not exceed 40 °C (104 °F)
as a result of the installation conditions.
To ensure sufficient cooling, a minimum clearance of 100 mm from adjacent components
must be observed at three lateral surfaces.
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