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2
Total service factor c
2
The total service factor comprises the basic service factor c
0
and
two further correction factors c
6
and c
8
.
Basic service factor c
0
The basic service factor c
0
takes into account the daily duration of
operation, the type of prime mover and the type of driven machine.
As it is virtually impossible to cover every combination of prime
mover/machine/operating condition in a single standardised
summary, the basic service factors must be taken as
guides
only.
The final drive will depend upon the loads involved in each case.
Table 2.1: Basic service factor c
0
Type of service and examples of
machine applications
Service factor c
0
at number of operating hours per day
Very heavy duty drives, continuous
operation with high shock loading
Grinding mills
Calenders
Extruders
Piston pumps and compressors
Lifting gear
Heavy duty drives, intermittent
operation with medium to high
shock loading
Machine tools
Woodworking machines
Eccentric drives
Belt conveyor systems (heavy goods)
Medium drives, intermittent operation
with low to medium shock loading
Mixing machines
Kitchen machines
Printing machines
Textile machines
Packaging machines
Belt conveyor systems (heavy goods)
Lightweight drives, shock-free and
steady running
Measuring equipment
Film cameras
Office machinery
Belt conveyor systems (lightweight goods)
2 Basics of Drive Design
2.1 Service factors, additional factors and formulae
c
0
Intermittent operation
Hydraulic motors
Low-speed turbines
Piston engines with small
number of cylinders
Steady operation
Electric motors
High-speed turbines
Piston engines with large
number of cylinders
c
2
= c
0
+ c
6
+ c
8
Summary of Contents for ZRL
Page 54: ...53 ...
Page 95: ...94 ZRM ZRP Data Sheet Notes ...
