SICK MPB10 - Page 33

•
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 table 11 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 table 12, 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