© Brüel & Kjaer Vibro ● S1079330.002 / V04 ● █ Page 37 of 188
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Brüel & Kjaer Vibro │ Instruction
VC-8000 MPS
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6.5 Use Rack Inhibit for Light Maintenance Activities
Rack Inhibit prevents all signal channels from going into alarm. This is very useful when you are doing
light troubleshooting at the rack.
Rack inhibit is very helpful and is easy to use. It is strongly recommended.
The nice thing about Rack Inhibit (when compared to Bypass) is that it does not “turn off” the channel.
You will still be able to see the measurement locally (for troubleshooting). The operators will be able
to see the values at the DCS (Modbus). The only thing disabled are the signal alarms.
The status of Rack Inhibit should be read (over Modbus or hardwire connection) and shown on
operation screens; this will ensure that it is turned off when maintenance activities are completed.
Be advised that Rack Inhibit is for light troubleshooting of sensors. Rack Inhibit does not prevent relay
trips caused by removing, reconfiguring, or rebooting a card.
6.6 Use Channel Bypass Appropriately
Signal (or relay) Channel Bypass is typically used when a signal (or relay) channel is not working
correctly and is causing nuisance alarms. This is a semi-permanent solution that is put in place until
the sensor can be replaced.
Channel Bypass will leave the sensor powered, but all other channel functions are turned off. This
means no values will be seen on the local display or on the DCS.
If you use channel bypass, verify how it will affect your relay logic. For example, if channel Brg 1X is
placed in bypass, how will it affect a relay configured to trip when both Brg 1X & Brg 1Y are in alarm.
Do not use Channel Bypass for maintenance; It is better to use Rack Inhibit. When troubleshooting
sensor issues, Rack Inhibit is more effective, as the channel values will still be shown on the local and
operator displays.
6.7 Reading the Event List
When you need to spend time in the VC-8000 event list, connect with your laptop and use the VC-
8000 Maintenance software.
Clicking on the column headers will sort the columns. You can also perform a multi-column sort. Sort
the first column by clicking the header; hold the SHIFT key and click the second header to add a
second (or third) column to the sort.
From the software, you can move events to Excel for further evaluation (or documentation). Select the
upper left corner of the event list and then copy and paste the list into Excel.
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