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5.3.2.2 Vibration Monitoring
The VLT AQUA Drive FC 202 can be used with an external vibration transducer (velocity or acceleration type 4–20 mA) to monitor
the vibration level in a motor or application. The available functions are baseline measurement, broadband trending, vibration dur-
ing acceleration and deceleration, and transient vibration trending. The vibration monitoring is performed using standardized
methods and threshold levels given in standards such as ISO 13373 for condition monitoring and diagnostics of machines or ISO
10816/20816 for measurement and classification of mechanical vibration. The advantage of performing this monitoring in the drive
is the possibility of correlating data with the actual operating conditions such as steady state running/ramping, load condition, or
speed.
The function detects faults as:
Imbalance and eccentricity.
Looseness.
Misalignment.
Mechanical resonance.
The function is not able to identify bearing wear-out in early stages.
Drive correlates vibration with motor speed.
N O T I C E
EVALUATING VIBRATION
The ISO 10816 standard provides guidance for evaluating vibration severity for machines operating within 10–200 Hz of frequen-
cy range. The standard shall be complied with before commissioning of vibration monitoring function.
5.3.2.3 Load Envelope
The VLT AQUA Drive can determine a baseline load curve for the application. When wear-out occurs, the load curve moves and
triggers a maintenance warning. The function is useful for fault detection in various applications with passive load:
Fouling, sanding, broken impeller, or wear-out of pumps.
Clogged filters and leakages in ventilation systems.
Friction in machines.
Cu
rr
en
t (
A
)
Frequency (Hz)
Upper threshold
Lower threshold
Baseline
-0.5
1
0.5
1.5
2
0
0
10
20
30
40
50
e3
0b
i2
93
.1
0
Illustration 22: Load Curve Example for Load Envelope Monitoring
AJ300847815559en-000101 / 130R0337
36 | Danfoss A/S © 2020.09
Product Overview
VLT® AQUA Drive FC 202
Design Guide