6
SERIES J
Table 2.
Description of load classifications
Load
classification
Example
Description
Mass acceleration factor
Load
classifications
Uniform
U
Uniform
Ua
Moderate
M
Heavy
H
Mass acceleration factor =
all external moments of inertia *
moment of inertia of driving motor
Service factors
Table 1.
Service factor fb
Daily operation
4 hours
8 hours
16 hours
24 hours
Starts per hour
<10 10-200 >200 <10 10-200 >200 <10 10-200 >200 <10 10-200 >200
Table 6.
Operation time factor fu (All cooling methods)
Table 5.
Ambient air velocity factor fv (Without electric fan)
Table 4.
Altitude factor fa (Only for air cooling)
Table 3.
Ambient temperature factor ft (All cooling methods)
Operation time per each hour
Factor fu
Altitude m
Factor fa
Ambient temperature °C
Factor ft
100%
1.00
80%
1.05
60%
1.15
40%
1.35
20%
1.80
Air velocity V ref
m/s
Environment
Vref < 0.5
Small confined space
0.53
0.5 < Vref < 1.4
Large indoor space
0.71
1.4 < Vref < 3.7 Sheltered outdoor space
1.00
Vref > 3.7
Outdoor space
1.35
10°C
1.17
15°C
1.12
20°C
1.06
25°C
1.00
30°C
0.94
35°C
0.88
40°C
0.81
45°C
0.74
50°C
0.66
* calculated with reference to the motor speed
0203
SELECTION PROCEDURE
U
0.8
0.9
1.0
0.9
1.0
1.1
1.1
1.2
1.3
1.3
1.4
1.5
Ua
1.1
1.2
1.3
1.1
1.3
1.5
1.3
1.5
1.6
1.4
1.6
1.8
M
1.3
1.4
1.6
1.3
1.6
1.8
1.4
1.7
1.9
1.5
1.8
2.0
H
1.5
1.6
1.8
1.6
1.8
2.0
1.7
1.9
2.1
1.8
2.0
2.2
Larger conveyors. Reciprocating pumps with 3 or
more cylinders.
Agitators and mixers for media with high viscosity and
/ or solid particles.
Larger conveyors. Reciprocating pumps with 3 or
more cylinders.
Agitators and mixers for media with high viscosity and
/ or solid particles
Heavy agitators and mixers. Reciprocating pumps
with 1 or 2 cylinders.
Crushers, mills and presses. Vibrators and shakers
Uniform loaded conveyors and elevators. Centrifugal
pumps and fans. Agitators and mixers for liquids and
semi-liquids without solid particles.
Machines with uniform load and no shocks
Mass acceleration factor < 0.2
Machines with small shocks and small
variations in load
Mass acceleration factor < 1
Machines with moderate shocks and
variable load
Mass acceleration factor < 3
Machines with very heavy shocks and
large masses to be accelerated
Mass acceleration factor < 10
0 - sea level
1.00
750
0.95
1500
0.90
2250
0.85
Factor fv
Summary of Contents for J 100
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