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█ © Brüel & Kjaer Vibro ● S1079330.002 / V04
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EN
7 Wiring - Power and Grounding
7.1 RCM Power Strategy
Redundancy
The (single) RCM accepts two external and independent supplies.
The RCM routes the +24 Vdc (from each supply) to the backplane. Each module (UMM, TMM, and
SAM) selects the highest in-specification voltage line. As soon as one voltage is removed or drops
below the other, all modules seamlessly switch to the alternate source, assuring uninterrupted
operation.
Distributed regulation
Some protection systems centrally regulate incoming power and then distribute every voltage needed,
the VC-800 does not. The RCM ensures that primary and secondary supplies are within acceptable
limits and then passes the voltage to the backplane. Each monitor (individually) uses that voltage to
generate the power (i.e. transducer power) that is needed.
This design philosophy reduces the potential for single-point failures. In the VC-8000 system,
regulator problems affect only a single monitoring module, not the entire rack.
Minimize heat inside the rack
Because the +24Vdc power supplies are located outside the rack, heat inside the rack is minimized
and the life of the system is prolonged.
7.2 Connecting Power
7.2.1 RCM Power Connections
The RCM provides the following power and grounding connections:
• +24 Vdc System Power Connection 1
• +24 Vdc System Power Connection 2
• System Chassis Ground (GND)
• Single Point System Common to Chassis Ground jumper
(COM to GND)
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