Bently Nevada vbBalancer Specifications
vb Balancer Series Portable Instruments
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
Unbalanced rotating machinery can cause high levels of
vibration which can degrade bearing life and cause major
mechanical complications. Reduce the possibility of outages
and downtime with our vbBalancer and vbBalancer+
portable instruments. Used on-site, they detect unbalanced
machinery and help you diagnose and immediately fix issues
before they become serious, expensiveproblems.
After you input a few basic parameters describing a machine,
use vbBalancer to identify current unbalance levels and
determine ifthe machine is operating within ISO 1940
standards.
If a machine needs balancing, use vbBalancer to identify the
mass and position of permanent balance weights.
To verify that balancing is working, the vbBalancer Series
record basic vibration spectra. Use vbBalancer to view
spectra before and after balancing to validate broad-band
improvement.
132M3167 Rev. A
The two-channel vbBalancer instrument has two
accelerometer inputs for simultaneous recordings. The fourchannel vbBalancer+ instrument uses vibration readings
from four accelerometer inputs to calculate the optimum
balance weights to apply to two correction planes,
minimizing total machine vibration. This enables you, for
example, to monitor both horizontal and vertical axes on a
two-bearing machine, giving you confidence that the
balance you applied to one axis has not worsened vibration
on the other.
The vbBalancer Series provides recordings with up to 800 lines
of resolution and up to 5 kHz Fmax. The vbBalancer Series has
plenty of storage capacity and features all-day battery life.
We back these instruments with a five year warranty.
vb Balancer Series Portable Instruments
Datasheet 132M3167 Rev. A
The vbBalancer Series offers:
l Two or four-channel simultaneous
recordings
l Dual-plane balancing
l Laser speed sensor for machine speed
and vibration phase angle detection
l Keyphasor tach mode (vbBalancer+
only)
l 800 line vibration spectra with Fmax up to
5 kHz
l 1 GB memory
l ≥ 95 dB dynamic range
l Both instruments support IEPE
Accelerometer sensors, and the
vbBalancer+ additionally supports
velocity and displacement sensors
l The vbBalancer+ additionally supports
these balancing-related analysis
features: coast-down and run-up, bump
test, orbit plot
l Sensor cable self-test feature
l USB host port for data transfer to external
USB drive
l Upgradable Proflash system and free
firmware updates for five years
2/10
vb Balancer Series Portable Instruments
Datasheet 132M3167 Rev. A
Specifications
Sensors
Parameter vbBalancer vbBalancer+ Notes
Channels
(simultaneous)
Compatible
sensor types
AC coupled
range
Connectors 2 x BNC (CH1/CH2) 1 x BNC (CH1)
Analog to
digital
conversion
Sensor
excitation
current
Sensor
detection
Two Four Simultaneous sampling
Accelerometer Accelerometer,
velocity and
displacement
16 V peak-peak Allows for ± 8 V sensor output swing (±
1 x LEMO (CH2, CH3,
CH4)
24-Bit ADC
0 mA or 2.2 mA (configurable),
24 V maximum
Warns if short circuit or not connected
Tachometer
80 g)
Safety feature: break-free inline
connector
2.2 mA required for IEPE/ICP®-type
accelerometer
Parameter vbBalancer vbBalancer+ Notes
Sensor Laser sensor with
reflective tape
Laser sensor
range
Other sensor
types
supported
Power supply
to sensor
TTL pulse rating 3.5 V (4 mA) min, 28 V (5 mA) max,
Keyphasor*
thresholds
Contact, TTL, pulse Contact, TTL, pulse,
N/A 7.7 ± 0.5 V 13.2 ± 0.8
10 cm to 2 m nominal Dependent on size of reflective tape
off-state 0.8 V
Laser sensor with
reflective tape
Keyphasor
5 V, 50 mA
V 18.5 ± 1 V
Sensor triggers on beam reflection
Optically isolated output
Nominally 8 V, 13 V, 18 V
3/10
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