6
uptime
m
e
gazine · 01/09
Safety & Condition Monitoring
DC Outputs
Live Data,
Trended Data
DFT Analyses,
Post-Mortem,
Alarm Status,
Relay Reset
Setup
Trip
Multiplier
Accelerometer and
Temperature Sensors
Bearing Temperature
·
·
·
Casing Vibration
REB Condition
Alert
Trending
Casing Vibr., REB Vibr., Temp.:
10 days to 10 months
Post-Mortem Logging
Casing Vibration:
-994 to +29 sec after Alarm
DFT Analysis
Casing Vibr.: 10-1000Hz
REB Condition: 500-5000Hz
Interface Converter
CAN-Bus/USB
CAN-Bus (up to 40x VC-1500)
Network
Interface
Danger OK
Relays
VC-1500
Control
Center
Software
feature calculates the lead time for
the trend to reach the Danger alarm
limits, together with the data quality
evaluation.
Post Mortem
When a Danger alarm is activated,
the VC-1500 automatically records all
overall vibration data at one second
intervals, 994 sec before the alarm
and 29 seconds after, for each ac-
celerometer. This data can be dis-
played locally on the panel screen
or remotely in a plot in the VC-1500
Control Center software to enable
the condition of the machine at the
time of the alarm or trip to be visual-
ized. This takes the guesswork out of
"what happened" before and after an
alarm or trip.
Remote Monitoring
The VC-1500 has an easy-to-use
local display for data visualiztion,
setup and analysis.This can also
be done remotely over the internet.
The VC-1500 uses the CAN-bus
fieldbus (Controller Area Network)
for sending and receiving informa-
tion to the VC-1500 Control Center
Basic software via an USB interface.
CAN-bus, a multi-master serial net-
working protocol with error detection
capability, is incredibly easy to use!
It is the most widely used fieldbus in
the world (with origins in the automo-
tive industry), and allows up to 40
VC-1500's to be interconnected in a
network.
Frequency Analysis
When trended data shows an in-
crease in amplitude or an Alert alarm
is activated, it is important to iden-
tify, localize or diagnose the fault in
order to plan maintenenance ahead
of time. The VC-1500 allows you to
manually request a Discrete Fourier
Transform analysis (DFT) to be done
with 320 lines of resolution on sam-
ples of the following types of meas-
urements:
n
Overall vibrations Velocity units,
RMS, frequency range 3-1000 Hz
n
Rolling-element bearing condition
Acceleration units, RMS, fre-
quency range 500-5000 Hz
The VC-1500's unique display shows
the highest vibration peaks together
with the associated frequencies for
each type of measurement for each
accelerometer. This frequency analy-
sis can be done at anytime so you
can identify the fault and follow its
development.
Conclusion
The primary task for any vibration
monitor is to reliably protect your
machines. But today's technology al-
lows the VC-1500 to do this plus help
optimise your machine uptime with its
added advanced condition monitor-
ing capability. Rack-based condition
Figure 1.
VC-1500 inputs,
outputs and
functionality.