BRUEL & KJAER VIBROCONTROL 8000 - 17.3.2 For Any (1 or 2 or 3…) Logic Block; 17.3.2.1 Radial Vibration Channel Example

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17.3.2 For Any (1 or 2 or 3…) Logic Block
The ‘For Any (1 or 2 or 3…)’ logic block performs the logical OR function. All channels in the selected
asset group (“With: The Rack”, or “With: Motor A”) are included in this logic. This block is often used
for annunciation of any Alert alarm on the machine.
Channel Status
(Any) Alert/Danger
Fault
Bypass
Logic block output
True
-
-
Table 17-2) Truth table For Any Channel (1 or 2 or 3…) logic block
This block performs as follows:
1. Logical OR function between all channels in the selected asset group. For example: (1X or 1Y
or 2X or 2Y or 3X etc.). When any channel evaluates to true the output of the block is true.
2. A Faulted or Bypassed channel does not vote ‘True’ or ‘False’. It is removed from the logic.
For example, If Channel X is bypassed (or in fault) the relay logic (1X or 1Y or 2X or 2Y) would
become (1Y or 2X or 2Y).
17.3.2.1 Radial Vibration Channel Example
The following logic (Figure 17-6) will activate the relay when any radial vibration channel in the Motor
group goes into Alert.
Figure 17-6) For Any (1 or 2 or 3…)’ logic block example
A channel that is faulted (or bypassed) cannot vote “True” and cannot trip the relay. See Table 17-3
for a few examples.
1 2 3 4 5
Brg 1X
Alert
Alert
Alert
Fault
Bypass
Brg 1Y
Ok
Fault
Bypass
Fault
Bypass
Brg 2X
Ok
Fault
Bypass
Fault
Bypass
Brg 2Y
Ok
Fault
Bypass
Fault
Bypass
Output
True True True False
False
Table 17-3) Radial Vibration channel, ‘For Any (1 or 2 or 3…)’ logic block, scenarios