BRUEL & KJAER VIBROCONTROL 8000 - Fault (Not OK) Relay

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Brüel & Kjaer Vibro │ Instruction

VC-8000 MPS

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9.2 Fault (Not OK) Relay

The Fault (Not OK) Relay activates whenever machine

protection is compromised due to a detected VC-8000 or

instrumentation failure such as a sensor going bad (Not OK).

When the DCS is connected to the Fault (Not OK) Relay, plant

operators can be notified that there is a problem with the

machinery protection system.

Figure 9-7) OK LED (on RCM)

The relay and its associated LED is located on the RCM module. When the system is operating

correctly the relay is energized and the OK LED is green. When there is a fault the relay de-

energizes and the OK LED is off. The relay will always de-energize on complete power loss. The

status of the relay can also be viewed via Modbus.

The following events will cause the Fault (Not OK) relay to activate:

• Sensor failure (Channel with a Not OK status)

• Any module reboots (UMM, TMM, or SAM)

• Any module is re-configured (UMM, TMM, or SAM)

Other (less common) events that will drive the Fault (NOT OK) Relay

• The SAM is removed from the rack (or stops communicating with the UMMs/TMMs)

• Internal Faults in a UMM/TMM

• If UMM/TMM relays are not in the expected state

• Invalid configuration in a UMM/TMM

The following events will NOT trip the OK Relay (fault tolerant)

• A single power supply fault will not trip the OK relay.

• Loss of communication to the PI Server (or other CMS Data Server) will not trip the OK relay.

CAUTION

Sensor faults (and sensor wiring issues) will trip the Fault (Not OK) Relay. Therefore, this

relay is not recommended for machine shutdown (trips); it is for notification only.