Pfeiffer Vacuum OKTA 2000 ATEX, Руководство по эксплуатации

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6.6 Vibration monitoring
WARNING
Risk of injury due to the bearing bursting after overheating
During longer operation with defective bearings, there is a risk of explosion due to hot surfaces if
there is a potentially explosive atmosphere.
► Perform a vibration measurement at the defined measuring points at the prescribed time inter-
vals.
► Switch the roots pump off if process-independent trend changes of characteristic variables occur.
Boundary conditions of the vibration measurement
The boundary conditions of the vibration measurement (including the operating conditions,
measurement parameters, etc.) and the equipment for vibration measurement (including
the vibration sensors) must comply with the requirements of the following directives and
standards.
●
VDI 3836 : Measurement and evaluation of mechanical vibrations of screw compres-
sors and roots blowers
● VDI 3832 : Measurement of structure-borne sound of rolling element bearings in ma-
chines and plant for evaluation of condition
●
DIN ISO 10816-1 : Mechanical vibrations – Evaluation of machine vibration by meas-
urements on non-rotating parts – Part 1
● DIN ISO 10816-3 : Mechanical vibrations – Evaluation of machine vibration by meas-
urements on non-rotating parts – Part 3
Assess the condition of pump, motor and bearing over the service life of the roots pump using changes
in the trend of characteristic variables, compared with a defined reference value from the start-up
phase. Due to the different set-up and process conditions, Pfeiffer Vacuum will not specify any binding,
generally-applicable limit values. The alarm, warning and shutdown limits for the oscillation variables
specified in the guidelines and standards are not adequate assessment criteria.
1
2
3
Fig. 14: Position of the vibration sensors
1 Position 1 (pump housing on fixed bearing side) 3 Position 3 (motor connection flange)
2 Position 2 (pump housing on floating bearing side)
Installing the vibration sensors
The vibration sensors are installed using the designated M8 threads at the designated positions.
● Position 1 and 2: Condition monitoring of the vacuum pump and the pump bearing
● Position 3: Condition monitoring of the motor
1. Screw the sensors in at the designated positions.
2. Use suitable adapters for sensors with a different thread.
3. As an alternative, fix the sensors to the intended positions using magnets (recessed areas).
Operation
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