Catalogue ATEX-compliant geared motors - Lenze

Thermal power limit
The permissible gearbox continous power is restricted by:
˘ The mechanical power, defined by the material strength
of the individual components or
˘ The thermal power limit, defined by the heat balance
The thermal power limit may be lower than the mechanical
power rating indicated in the selection tables.
Please consult the Lenze sales office
˘ if you are using the following gearbox type, size and
ratio combinations at input speed n1 > 1500 rpm:
Gearbox type Gearbox size Ratios
i <
GST 07, 09, 11, 14 10
GFL 07, 09, 11, 14 16
GKS 07, 09, 11, 14 25
...or if the input speeds n 1 listed are exceeded:
Mounting position Motor frame size
063...100 112...132
Drive size
1A...òE òF...òG
A, B, E, F 3000 rpm 3000 rpm
C, D 3000 rpm 1500 rpm
G-motion atex en 06/2011
Drive dimensioning
Dimensioning
The thermal power limit is affected by:
˘ The churning losses associated with the lubricant.
These are determined by the mounting position and
circumferential speed of the gears.
˘ The load and the speed
˘ The ambient conditions: temperature, air circulation, heat
input or dissipation via shafts and the foundation
2-3
2