26
ROSSI
GEARMOTORS
UT.D 123 rev. 3
Table 6. Thermal factor according to ambient temperature and
type of duty
1)
Duration of running on load [min]
60
· 100
Table 7. Thermal factor according to cooling system G05 and H02
Table 1.
Pt
N
gear reducers and gearmotors cat. G05
Table 2.
Pt
N
for gear reducers cat. H02
Table 3.
Pt
N
for gear reducers and gearmotors cat. E04
Table 5. Thermal factor ATEX
Corrective factor Pt
II 2 G/D
II 3 G/D
0,8
(0,71 for trains of gears
I and CI)
0,9
(0,8 for trains of gears
I and CI)
1) With simultaneous water cooling by coil, values are multiplied by
1,8
.
2) Value valid also for electric fan (installed by the Buyer).
5.7 Thermal power
P
t [kW]
The following tables show the nominal thermal power Pt
N
which can be
applied at the gear reducer input when operating on
continuous duty
,
maximum ambient temperature 40 °C, max altitude
1 000 m
, air speed
1,25 m/s
and max humidity 80%, without the
oil temperature exceeding 95°
C aprox.
In order to calculate
the real thermal power
, which may be applied with
gear reducer running, multiply the power rating stated in tables 1, 2, 3, 4
by the corrective thermal factors of tables 5, 6, 7 and by those of the ch.20.
For right angle shaft gear reducers and gearmotors with double extended
low speed shaft multiply thermal power by
0,85.
For gear reducers and gearmotors with
V
train of gears, mounting position
B6 or B7, multiply P
t
N
by 0,9.
When the thermal power is not stated in the tables 1, 2, 3, 4, it is to be
considered as verified.
Cooling system
n
1
[min
-1
]
710
900
1 120
1 400
Natural
1
Fan cooling
1)
Parallel shafts with 1 fan
1,12
1,18
1,25
1,32
Right angle shafts. Parallel shafts with 2 fans
1,25
1,4
1,6
1,8
2)
Water cooling by coil
2
Train of gears
Gear reducer size
P
t
N
[kW]
400,401 450,451 500,501 560,561 630,631
Parallel shafts
2I
236
265
375
425
530
3I
180
200
280
315
400
4I
132
150
212
236
300
Right angle shafts
CI
224
315
–
–
–
C2I
180
200
280
315
400
C3I
132
150
212
236
300
Train of gears
Gear reducer size
P t
N
[kW]
80, 81 100, 101 125, 126 140
160
180
Coaxial
2I
15
22,4
33,5
35,5
53
56
3I
–
–
25
26,5
40
42,5
Train of gears
Gear reducer size
P t
N
[kW]
50
63, 64 80,81
100
125
140
160
180
200
225
250
280
320, 321
360
Parallel shafts
I
–
11,2
17
25
37,5
50
56
80
90
125
140
200
224
315
2I
5
7,5
11,2
17
25
28
37,5
42,5
60
67
95
106
150
170
3I
–
–
–
–
–
21,2
28
31,5
45
50
71
80
112
125
Right angle shafts
CI
4,75
7,1
10,6
16
23,6
31,5
35,5
50
56
80
90
125
140
200
ICI
–
–
–
–
16
18
23,6
26,5
37,5
–
–
–
–
–
C2I
–
–
–
–
–
21,2
28
31,5
45
50
71
80
112
125
Maximum
ambient
temperature
°C
Duty
continuous
S1
on intermittent load
S3 ... S6
Cyclic duration factor [%]
for 60 min running
1)
60
40
25
15
40
1
1,18
1,32
1,5
1,7
30
1,18
1,4
1,6
1,8
2
20
1,32
1,6
1,8
2
2,24
10
1,5
1,8
2
2,24
2,5
–
standard
level of reliability; if a
higher
degree of reliability is
re quired (particularly difficult maintenance conditions, key import-
ance of gear reducer to production, personnel safety, etc.) multiply
f
s by
1,25
1,4
.
Motors having a starting torque not exceeding nominal values
(star-delta starting, particular types of motor operating on direct
current,and single-phase motors), and particular types of coupling
between gear reducer and motor, and gear reducer and driven
machine (flexible, centrifugal, fluid and safety couplings, clutches and
belt drives) affect service factor favourably, allowing its reduction in
certain heavy-duty applications; consult us if need be.
