•
Unbalance
•
Misalignment
•
Relaxation
As with the
a-RMS
, the sensor for the
v-RMS
also provides the magnitude, the effective
value of the sum vector of all three axes, which represents the energy contained in the
vibration without directional separation.
9.3.1.3
Limit values based on ISO 10816 (Index 4534-4536)
The ISO10816-3 standard defines limit values that indicate whether
v-RMS
amplitudes
are acceptable when operating rotating machines. Here, 4 evaluation zones are
defined, which describe the machine condition on the basis of the
v-RMS
vibration
values.
The limit values shown in
can be set automatically in the sensor by specifying
the machine type and the associated subassembly.
Machine group 1: Nominal power > 300 kW and < 50 MW, axis height ≥ 315 mm
Machine group 2: Nominal power > 15 kW < 300 kW, axis height 160 mm ≤ and
< 315 mm
Table 11:
v-RMS
limit values based on ISO 10816-3
Machine group
Machine group 1
Machine group 2
Substructure
Elastic substruc‐
ture
Rigid substruc‐
ture
Elastic substruc‐
ture
Rigid substruc‐
ture
Zone limit C/D
[mm/s]
11
7.1
7.1
4.5
Zone limit B/C
[mm/s]
7.1
4.5
4.5
2.8
Zone limit A/B
[mm/s]
3.5
2.3
2.3
1.4
Zone
D
Machines that have vibrations in this range can be damaged.
Zone
C
Machines that have vibrations in this range can run in limited operation. Continuous operation is not
considered suitable.
Zone
B
Machines that have vibrations in this range can run without restrictions.
Zone
A
Newly commissioned machines exhibit vibrations in this area.
The configuration of the sensor for monitoring based on ISO 10816-3 is done via Index
4535. When writing to this index, the corresponding limit between zone B and C is
automatically set as the pre-maximum limit value for
v-RMS
. The limit between zone C
and D is set as the maximum limit value. The zone boundaries are also automatically
entered in Index 4536. The limits in ISO 10816-3 are defined considering a frequency
range of 10-1,000 Hz, therefore this frequency range is also configured in the sensor.
In
, an example of parameterization for a machine from group 1 with a rigid
substructure and a current
v-RMS
of 3.5 mm/s is shown. Index 4534 can be used to
read out in which evaluation zone the plant falls with the currently measured
v-RMS
value.
Table 12: Example parameter ISO 10816
Index
Content
Value
4534
Current evaluation zone
2 = Zone B
4535
Preselection
1 = Group 1: elastic
4536 (Subindex 3)
Zone border C/D
7.1 mm/s
4536 (Subindex 2)
Zone border B/C
4.5 mm/s
4536 (Subindex 1)
Zone border A/B
2.3 mm/s
OPERATION
9
8028041/2022-08-16 | SICK
O P E R A T I N G I N S T R U C T I O N S | MPB10
33
Subject to change without notice
