25
ROSSI
GEARMOTORS
UT.D 123 rev. 3
– mount the gear reducer onto the shaft end of driven machine following
the method indicated in fig. 4a, page 40;
– gradually and uniformly tighten the screws of shrink disc by a con-
tinuous sequence (not crossing) and during several phases up to a
torque stated in the table 11b;
– at operation end verify the screw tightening torque by means of a dyna-
mometric key (flat, when the shrink disc is mounted onto machine end).
Protect the shrink disc whit a closed cover ( to be
mounted sealing the mating surface with locking
adhesive) in order to avoid the propagation of sparks
or the reaching of exceeding external superficial tem-
peratures when sliding (see the SPT schemes attached to UT.
D123).
The protection is compulsory for machines of
category 2. Seal the coupling of hollow shaft and shaft end of
driven machine with adhesive, on opposite side to shrink disc.
The locking adhesive to be used must resist at a temperature
135 °C.
Attention!
Do not tighten the screws of shrink disc before mounting the
gear reducer onto machine shaft in order not to deform the hollow shaft.
5.5 - Water cooling by coil
The presence of coil is given by water inlets (pipes DIN 2353) protru-
ding from the casing as shown in the following figure.
1)These values for some mounting positions and designs can vary.
Attention!
Do not tamper with the eventual stop plate in
order to keep the pipes locked; in particular keep the pipe
locked while tightening the nut of connection pipe.
Unless specific indications given on the documentation
attached to UT.D 123,
water
fed into the system must:
– be not too hard;
– be at max tempe20 °C;
– flow at 10
20 dm
3
/min depending on gear reducer size;
– have a pressure 0,2
0,4 MPa (2
4 bar).
Where ambient temperature may be equal to or less than 0 °C, make
provision for water drain and compressed air inlet, so as to be able to
empty out the coil completely and avoid freezing up.
The thermostatic valve permits to have water circulation auto-
matically and without auxiliary supply need, when gear reducer
oil reaches the set temperature. The valve sensor is equipped
with immerson bulb. Mounting and setting, adjustable within
50
90 °C, must be mounted during the assembly. For the setting
use the control knob on valve head.
For ambient temperature lower than 0 °C consult us.
Setting values advised for operating temperature: 50
65 °C.
The direction of flow of the cooling water is discretionary.
The user must install a flow indicator or other device
on the water delivery to ensure the gear reducer/
gearmotor stops when the flow drops below the
required rate;
if the delivery water pressure is too high
or there is a risk of this occurring, install a reducer valve on the
delivery line.
The instruments must be according to ATEX depending on the area
of application and installed as close as possible to the gear reducer/
gearmotor.
The ends of the cooling coil protruding from the gear reducer must
not be damaged (bent, dented, obstructed) as this can prejudice the
correct flow of water for cooling or result in leaks.
Before connecting the coil to the pipe fittings used for feeding and
draining of the cooling water, first rinse to clear out any possible
obstructions.
A polished metallic pipe (with external diameter
d
stated on table) is
sufficient for the connection.
Table 1c. Nature of load and running time (E04)
Nature of load
of driven machine
Running time [h]
Ref.
Description
3 150
6 300 12 500 25 000 50 000
2 h/d
2÷4 h/d 4÷8 h/d 8÷16 h/d 16÷24h/d
a
Uniform
0,8
0
0,9
0
1
,00
1,18
1,32
b
Moderate overloads
(
1,6
x nominal load)
1
,00
1,12
1,25
1,5
0
1,7
0
c
Heavy overloads
(
2,5
x nominal load)
1,32
1,5
0
1,7
0
2
,00
2,24
Table 1b. Nature of load and running time (A04)
Nature of load
of driven machine
Running time [h]
Ref.
Description
3 150
6 300 12 500 25 000 50 000
2 h/d
4 h/d
8 h/d 12 h/d 24 h/d
a
Uniform
0,67
0,85
1
,00
1,25
1,6
0
b
Moderate overloads
(
1,6
x nominal load)
0,85
1,06
1,25
1,6
0
2
,00
c
Heavy overloads
(
2,5
x nominal load)
1
,00
1,25
1,5
0
1,9
0
2,36
size
d A
1)
spanner
Ø
≈
125 ... 180 12
1
40 22
200 ... 280 12
1
50 22
320 ... 360 16
1
60 30
400 ... 631 16 200 30
Table 1a. Nature of load and running time (G05, H02)
Nature of load
of driven machine
Running time [h]
Ref.
Description
6 300
12 500 25 000 50 000 80 000
2 h/d
4 h/d
8 h/d
12 h/d
24 h/d
a
Uniform
0,8 (1)
1)
0,9 (1)
1)
1
,00
1,18
1,32
b
Moderate overloads
(
1,6
x nominal load)
1 (1,12)
1)
1,12 (1,18)
1)
1,25
1,5
0
1,7
0
c
Heavy overloads
(
2,5
x nominal load)
1,32 (1,4)
1)
1,5
1,7
0
2
,00
2,24
1) The different values of cat. H02 are enclosed within brakets.
A
Gear reducer
size
A
1)
≈
B
1)
≈
d
Ø
125 ... 180
40 40 12
200 ... 280
50 40 12
320 ... 360
60 45 16
NOTE
: Verify, with the help of table 13 (page 34), that all installation
operations have been duly done.
It is necessary to protect the thermostatic valve from any shock or stroke.
5.6 - Service factor fs requested
1) Values valid for B3 m.p. and U... A
design only. For other m.p. and/or
design: consult us.
Table 2.
Frequency of starting (G05,
E04,
A04, H02)
2)
n
2
min
-
1
560
355
1,25
355
224
1,18
224
140
1,12
140
90
1,06
90
1
Ref.
load
4)
Frequency of starting z [avv./h]
2 4
8
16 32 63 125 250
a
1 1,06 1,12 1,18 1,25 1,32 1,4 1,5
b
1 1
1,06 1,12 1,18 1,25 1,32 1,4
c
1 1
1
1,06 1,12 1,18 1,25 1,32
Table 3. Output
speed n
2
(G05 and
H02
3)
)
2) For cat. H02 it is necessary to multiply by 0,5 the frequency
of starting in table, for cat. A04 multiply by 2.
4) a) uniform; b) moderate overloads (
1,6
x nominal load); c)
heavy overloads (
2,5
x nominal loads),
3) For cat. H02 multiply
also by
1,06
.
Table 4.
ATEX corrective factor
f
s ATEX (G05, H02, E04, A04)
II 2 G/D
II 3 G/D
ATEX corrective factor
f
s
1,25
1,12
Details of service factor and considerations.
Given fs values are valid for:
– electric motor with cage rotor, direct on-line starting up to 9,2 kW,
star-delta starting for higher power ratings; for direct on-line starting
above 9,2 kW or for brake motors select fs according to a frequency
of starting double the actual frequency; for internal combustion engi-
nes multiply fs by 1,25 (multicylinder) or 1,5 (single-cylinder);
– maximum time on overload 15 s; on starting 3 s; if over and/or
subject to heavy shock effect, consult us;
– a whole number of overload cycles (or start)
imprecisely
com-
pleted in 1, 2, 3 or 4 revolutions of low speed shaft; if
precisely
a
continuous
overload should be assumed;
Service factor fs takes into account the different running conditions
which must be referred to when performing calculations of gear
reducer verification. The service factor is obtained by multiplying the
different factors of tables below depending on catalogues.
