Bosch Rexroth GTM Series, Project Planning Manual

Page: 30 / 90

5-2
Notes Regarding Application Planetary Gearboxes
DOK-GEAR**-GTM********-PR01-EN-P
The second code number defines the degree of protection against
water. The code number 5 means
•
Protection against a water jet from a nozzle directed against the
housing from all directions (jet water)
The housings are primed and can additionally painted with up to 40
µ
m of
paint.
The prime protects against
•
weather, yellowing and chalking
•
diluted acid and alkali
The primer can, however, peel when the primer is exposed to repeated
steam cleaning.
Operation S5 (intermittent operation)
GTM planetary gearboxes are suitable for the intermittent operation
(intermittent operation with braking) according to EN 60034-1. The duty
cycle should herewith not surpass 60%.
% 60 % 100
T
T T T
ED
S
Br B A
≤ ⋅
+ +
=
A cycle during intermittent operation consists of an acceleration and a
decelerating.
The specified data of the gearboxes in the chapter “Technical data” are
valid for 1,000 cycles per hour.
For more than 1,000 cycles per hour, the technical data have to be
reduced by a factor (see Fig. 5-3).
Time t
P
V
n
T
A
T
B
T
Br
T
s
n = Speed
P
V
= Power loss
T
A
= Starting time
T
B
= Operation time
T
Br
= Braking time
T
s
= Duty cycle time
Power loss curve over time
Speed curve over time
GK000006v01_en.EPS
Fig. 5-2: Operation S5 (intermittent operation with electronical braking)
Are higher cycles than 1.000 cycles per hour needed, the following
reduced technical data, regarding torque and power are valid.
Reduction f
actor k
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
GK000008v01_en.EPS
Fig. 5-3: Reducing factor at higher cycles
Housing paint
Reducing at higher cycles