ROSTA
5.5
Motorbases
Test force table by initial V-belt installation
(standard values for the most common types of V-belts)
Test forces for ideal belt tensioning
The ROSTA Motorbase is offering with its
mechanical pretensioning device the ideal
calibration of the relevant belt tension,
based on the test force recommendations
of the belt suppliers. These recommended
test forces for the most common V-belt
sizes are mentioned in the test force table
on the right.
Exception
For screen applications the belt only tigh-
ten enough that they do not slip during
start-up and operation.
* Test force for V-belts. By ideal belt tensioning a deflection of 16 mm
per 1000 mm pulley center distance shall occur. (By shorter or longer
span, the value 16 mm has to be interpolated.)
V-belt type
Width
[mm]
Height
[mm]
Diam. of smal-
ler pulley [mm]
Initial operation
test-force F
I
* [N]
Operational test-
force F
O
* [N]
XPZ, SPZ
10
8
56–71
75–90
95–125
≥
125
20
22
25
28
16
18
20
22
XPA, SPA
13
10
80–100
106–140
150–200
≥
200
28
38
45
50
22
30
36
40
XPB, SPB
16
13
112–160
170–224
236–355
≥
355
50
62
77
81
40
50
62
65
XPC, SPC
22
18
224–250
265–355
≥
375
87
115
144
70
92
115
Z
10
6
56–100
5–7.5
A
13
8
80–140
10–15
B
17
10
125–200
20–30
C
22
12
200–400
40–60
D
32
19
355–600
70–105
ø d
F
16 mm deflection
Per 1000 mm of span
Usual positioning of the ROSTA Motorbase
These recommendations are based on practical experience, a test run will show the ideal adjustment.
Screen drive applications
„Overhead“ Configuration
ca.45°
ca.15°
„Along-Side“ Configuration
Motor ca. –15° to –45°
Motor ca. +15° to +45°
ca.15°
„Foot-Mounting“ Configuration, Feeder
Extended “off-set” and larger Motorbase
size recommended.
ca.30°
Pump drive applications
Crusher applications
„Overhead“ Configuration
Motor plate „off-set“, towards the pretensioning device.
ca.30°
„Along-Side“ Configuration
Variable Loads
Motor plate „off-set“, towards the pretensioning device.
ca.15°