© Brüel & Kjaer Vibro ● S1079330.002 / V04 ● █ Page 59 of 188
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Brüel & Kjaer Vibro │ Instruction
VC-8000 MPS
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9.3 Rack Control Signals (Reset, Inhibit, Trip Multiply, SAI, Bypass)
There are six input commands (controls) available on the VC-8000. These functions are described in
the table below.
Command Description
Reset (RST)
Resets all latched alarms. This control is highly recommended
when using latched alarms in the MPS.
Inhibit (INH)
Inhibits (disables) all alarming on all signal channels. Inhibited
channels still show data, but the channels will not alarm.
Trip Multiply (TM)
INH does not disable relays, it disables alarms that drive the
relays.
Special Alarm Inhibit (SAI)
Using this control is highly recommended. It allows the
operators to temporarily disable alarming; for example, when
a technician is troubleshooting a sensor.
Signal Channel Bypass
Alarm set-points will be increased by the configured TM factor
(i.e. 2x, or 3x). This feature is intended for large machines that
pass through critical speeds (resonance) on start-up.
Relay Channel Bypass
Inhibits all alarms on Aero-derivative channels. (only used for
Aero-derivative machines)
Table 9-5) VC-8000 control inputs
Four of the control signals (RST, INH, TM, SAI) can be activated using the discrete input (DI)
connector on the RCM. These same four controls can be activated using Modbus. These controls act
on the rack (all channels).
Two of the controls (Signal Bypass, Relay Bypass) can be activated with the VC-8000 Maintenance
software. These controls act on the channel.
Although rarely used, three of the controls (Signal Bypass, INH, TM) can be activated using a UMM
Discrete Input channel and act on a machine group (rather than the whole rack). The machine group
is defined by the Asset Level 1 setting (see section 12.2.3).
Table 9-6 shows these six commands and how they can be set, and if the command applies to the
whole rack, a group within the rack, or a single channel.
Command RST INH TM SAI Signal Bypass Relay Bypass
UMM Discrete Input channel
Table 9-6) Control input - acting on rack, group, or channel
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