© Brüel & Kjaer Vibro ● S1079330.002 / V04 ● █ Page 35 of 188
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Brüel & Kjaer Vibro │ Instruction
VC-8000 MPS
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5 Engineering – CMS Gateway
The VC-8000 is perfectly designed to replace existing machinery protection racks (for example BN
3300 or 3500). However, in some cases this is not practical and the VC-8000 will be installed as a
gateway for CMS data only.
This solution can be very effective, and the VC-8000 rack remains
usable for machinery protection, in the future, if required.
The most common concern when implementing a CMS Gateway
solution is where to locate the VC-8000 and how to connect to the
existing protection system. Most existing protection systems have
connectors on the back of the rack for permanent connection to
buffered output signals.
Please consider the following when implementing a CMS gateway
solution.
Signal Noise (Environment)
Most signal noise issues are caused by poor cabling decisions.
For example, the cable is not properly shielded, or is not shielded
at all, or the signal cable is in the same cable tray with power
cables.
Figure 5-1) Dynamic signal
connector
Multi-signal cables
In a CMS Gateway solution, it is typical to run multiple signals
(channels) in a single cable. For example, the connector shown in
Figure 5-1) has 24 buffered output signals for a single cable
connection. B&K Vibro recommends limiting the length of multi-
signal cable lengths to 30 ft. (10 m).
Standard signal cable (with one signal per cable)
For standard shielded cables with one signal per cable, the
allowed length is 1000 ft. (300 m) (or more) depending on your
cable specifications and signal frequencies.
For the connector +in Figure 5-1), a longer cable run can be
achieved by using a breakout device (Figure 5-2). The long cable
run can be made with individual signals per cable.
Figure 5-2) Break-out module
Configuration Tips for CMS Gateway Applications
When VC-8000 input signals come from buffered outputs (from another monitoring system), set the
VC-8000 channel (transducer power) to high impedance (High-Z Input).
When there is no connection to an active UMM channel configured with ‘High-Z Input’
transducer power, the UMM Gap voltage will show 18.0 Vdc
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