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3.5
Cooling
1FK7 DYA G2 is non-ventilated.
The housing surface is sufficient for dissipating heat losses where there is free convection.
Note
Dust deposits prevent heat radiation
Dust deposits prevent heat radiation and cause a high housing temperature.
• Keep the motor free of contamination, dust and other deposits.
The rated data of the 1FK7 DYA G2 only apply up to an ambient temperature of 40 °C
(104 °F).
To ensure sufficient cooling of the 1FK7 DYA G2, maintain a minimum clearance of 100 mm
from adjacent components on three lateral surfaces.
If the housing temperature exceeds a value of +80 °C, please contact Technical Support.
3.6
Holding brake
3.6.1
Type of holding brake
The holding brake is implemented as a permanent-magnet brake.
The magnetic field of the permanent magnets exerts a pulling force on the brake armature
disk. This means that in the no-current condition, the brake is closed and the motor shaft is
held.
When a 24 V DC rated voltage is applied to the brake, the current-carrying coil produces an
opposing field. This neutralizes the force of the permanent magnets and the brake opens
without any residual torque.
The permanent magnet brake has a torsionally stiff connection to the motor rotor. As a
consequence, the brake has no play.
NOTICE
Damage to the motor due to axial forces on the shaft extension
Axial forces on the shaft extension can damage motors with an integrated permanent-
magnet holding brake.
• Avoid axial forces on the shaft extension.
S-1FK7 DYA G2 synchronous motors with planetary gearbox
Operating Instructions, 05/2018, A5E44881183B AA
Mounting and options
3.5 Cooling
39
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