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Technote #Cm3 Vibscanner: Orbit Measurement With The Signal Adapter Vib 8.747 and The Automatic Channel Switch Vib 5.446

The document describes how to use a VIBSCANNER device to record the relative shaft vibration or orbit of a gas turbine. It involves using a signal adapter and automatic channel switch to connect the VIBSCANNER to an existing Bently Nevada machine protection system and vibration sensors on the gas turbine. The summary provides an overview of the key components, connection process, and measurement steps to perform an orbit measurement and evaluation.

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JHON ANGEL VARGAS HUAHUASONCCO
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56 views2 pages

Technote #Cm3 Vibscanner: Orbit Measurement With The Signal Adapter Vib 8.747 and The Automatic Channel Switch Vib 5.446

The document describes how to use a VIBSCANNER device to record the relative shaft vibration or orbit of a gas turbine. It involves using a signal adapter and automatic channel switch to connect the VIBSCANNER to an existing Bently Nevada machine protection system and vibration sensors on the gas turbine. The summary provides an overview of the key components, connection process, and measurement steps to perform an orbit measurement and evaluation.

Uploaded by

JHON ANGEL VARGAS HUAHUASONCCO
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Condition Monitoring

TechNote #CM3 VIBSCANNER®


Orbit measurement with the signal adapter VIB 8.747 and the
automatic channel switch VIB 5.446*

Brief description
This technical note describes how VIBSCANNER can
record the relative shaft vibration (orbit) of an aggre- Bently Nevada
gate (here: gas turbine) using the signal adapter VIB machine protection
8.747. The sensor signal is measured on the buffered system
3300 series
outputs of a Bently Nevada machine protection sys-
tem (3300 series).

3 x BNC cable
(VIB 344221-X)
Advantages
Quick and easy check of the turbine condition using
IN
an orbit measurement. This provides the maintenance
staff with accurate information on which to base Signal adapter
further maintenance decisions. VIB 8.747

Measurement object OUT

Gas turbine: Type GE Frame 6


2 x TNC-BNC cable
Output: 38 MW (VIB 314221-X)
Site: Combined cycle co-generation site

Measurement configuration
The sensors and machine protection system have
VIB 5.432-2,9
already been installed. 2 x VIB 5.433

Signal adapter IN:


Connect 3 BNC cables to the Bently Nevada measure-
ment amplifier (3300 series).
One channel for the trigger signal, two channels for Automatic channel
the signals of the shaft vibration sensors. B A
switch VIB 5.446

Signal adapter OUT:


Connect the trigger cable (VIB 5.432-2,9) to the
VIBSCANNER digital input.
Connect two TNC-BNC cables with two VIBSCANNER
cables for small signal voltage (VIB 5.433) to the
channel switch (VIB 5.446). Connect the channel
switch to the analog VIBSCANNER measurement VIBSCANNER
channel.

* Application with manual channel switch (VIB 5.445) is described


in TechNote CM5.
PRÜFTECHNIK Condition Monitoring
VIBSCANNER® TechNote #CM3 - Page 2 of 2

Measurement
Select orbit measurement, and open the sensor setup.

Select user-defined (voltage) sensor, and enter the


parameters for sensitivity, frequency range, and off-
set. Note the specification of the signal adapter and
measurement amplifier.
Settings in VIBSCANNER
Start measurement:
- RPM measurement and stability check via the
trigger channel.
- First signal measurement via channel A.
- Measurement channel is changed
- RPM is checked.
- Second signal measurement via channel B.

Save the measurement and load the result in OMNI-


TREND using ‘Multimode-Import’.

The following example shows a typical shaft move-


ment (orbit) of the gas turbine mentioned above.

Evaluation in OMNITREND

Combined cycle co-generation site Gas turbine

PRÜFTECHNIK AG
P.O. Box 12 63
D-85730 Ismaning, Germany
Phone: (+49) 89 99 61 60
Fax: (+49) 89 99 61 62 00
http://www.pruftechnik.com Productive maintenance technology

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