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Brüel & Kjaer Vibro │ Instruction
VC-8000 MPS
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9.6 Relay Output
Relay outputs from the VC-8000 can be used to drive annunciators (lights,
horns), to drive a machine trip circuit, or to connect to a DCS etc. The DCS
might use the input for a status indicator on an operator screen (HMI) or to
drive a secondary relay.
There are four relays in each UMM/TMM. Each relay is programmable and
independent. For example, a “Common High Vibration” relay can be
programmed, with input status (logic) coming from every signal channel on
the machine.
9.6.1 Relay Wiring
Relay wiring ARM-NC (or ARM-NO) will depend on your site. The labelling
of the relay connector is: NO (normally open), ARM (armature), and NC
(normally closed); the labeling refers to the position of the relay contact
when the rack is not powered.
The relay can be configured to be normally energized (fail safe) or normally
de-energized operation (see Section 17).
Figure9-16) Relay Operation
The VC-8000 does not place any voltage on the connectors (ARM, NC, NO); the voltages come from
other systems connected as part of the trip circuit. If you power down the VC-8000 rack, these
external voltages will still be present on the wires!
High voltages (from trip circuits) may be present on relay wiring. Remove power from
trip circuits before servicing VC-8000 relay connections.
See UMM product data sheet for max voltage allowed on relays.
Figure 9-15) Relay Connector
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