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Prima pagina / Teorie / Serviciul factor
  - Serviciul factor

This value indicates how a certain drive system is to be over-sized in order to assure the requested service and stand up to shocks.

The tables given in the catalogue offer a wide range of drive system with different service factors able to satisfy most types of applications. To correctly understand service factor values sf given for each item, approximate values for load classes A, B and C along with the number of hours of daily operation h/d and number of start-ups/hours need to be known.

Once the load class required for the application has been determined, locate corresponding value sf to be used when selecting the most suitable drive system.
Type of load
A- Uniform
fa < 0,3
 fa = Je/Jm
-Je (kgm2)moment of reduced external intertia at the drive shaft
-Jm (kgm2) moment of intertia of motor
If fa > 10 call our Technical Service
B-Moderate shocks
fa<3
C-Heavy shocks
fa<10

A Uniform load

sf
h/d
n. start-up/ hour
2
4
8
16
32
63
125
250
500
4
0.8
0.8
0.9
0.9
1.0
1.1
1.1
1.2
1.2
8
1.0
1.0
1.1
1.1
1.3
1.3
1.3
1.3
1.3
16
1.3
1.3
1.3
1.3
1.5
1.5
1.5
1.5
1.5
24
1.5
1.5
1.5
1.5
1.8
1.8
1.8
1.8
1.8

B Moderate shock load

sf
h/d
n. start-up/ hour
2
4
8
16
32
63
125
250
500
4
1.0
1.0
1.0
1.0
1.3
1.3
1.3
1.3
1.3
8
1.3
1.3
1.3
1.3
1.5
1.5
1.5
1.5
1.5
16
1.5
1.5
1.5
1.5
1.8
1.8
1.8
1.8
1.8
24
1.8
1.8
1.8
1.8
2.2
2.2
2.2
2.2
2.2

C Heavy shock load

sf
h/d
n. start-up/ hour
2
4
8
16
32
63
125
250
500
4
1.3
1.3
1.3
1.3
1.5
1.5
1.5
1.5
1.5
8
1.5
1.5
1.5
1.5
1.8
1.8
1.8
1.8
1.8
16
1.8
1.8
1.8
1.8
2.2
2.2
2.2
2.2
2.2
24
2.2
2.2
2.2
2.2
2.5
2.5
2.5
2.5
2.5

Application example:

Conveyor belt assigned to load class B (moderate shock load), to be run 16 hours a day (h/d) with 8 start-ups/hour.

The following value is obtained from the table: sf = 1.5

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