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█ © Brüel & Kjaer Vibro ● S1079330.002 / V04
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EN
9.3.1 RCM Discrete Input Connector
There are four discrete control input signals on the RCM: Rack
Reset (RST), Rack Inhibit (INH), Rack Trip Multiply (TM), and Rack
Special Alarm Inhibit (SAI).
These four controls operate at the rack level. For example, if the
Inhibit contact is closed, all signal channels in the rack will be
inhibited.
These are dry contact, discrete inputs; they are active low and are
asserted (turned on) when the input signal is pulled to common.
The discrete inputs are 5 V logic compatible and can be pulled low
by logic gates.
Connect to the discrete inputs using AWG 14 to AWG 28 wire.
When using ferrules, the maximum wire size is 1 mm² (17 AWG).
Connecting high voltage wetted relays to the
discrete contacts can damage the module.
Connect only dry contact relays or low voltage
logic.
CAUTION
Rack Inhibit (INH) prevents internal signals (in the rack) from driving an alarm.
Rack Inhibit does not prevent
a relay trip that occurs when the rack loses power, a
card is removed from the rack, or when a card is re-configured.
Higher contact potentials cause current levels which are extremely dangerous and can
lead to injury or even death!
The permissible levels of contact potentials are:
• Max. 50 Volts in the case of AC voltages.
9.3.2 UMM Discrete Input Channel
Although rarely used, you can configure UMM
Discrete Input channels to perform Trip Multiply,
Inhibit, and Bypass functions for machine groups
defined in the rack. Use the Asset Level 1 field to
define the machine groups.
When the rack is protecting multiple machine trains,
this feature allows independent control functions for
each train (see section 25.4).
Figure 9-10) UMM Discrete Input channel
Figure 9-9) RCM Discrete Inputs
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