Disarm; Channel Disarm; Slot Disarm; Rack Disarm - SKF Multilog On-Line System IMx-M User Manual

Protection
Protection Part Operation

Disarm

There are three different types of disarm;


Channel disarm



Slot disarm



Rack disarm

Important - In order to engage disarm when relays are configured to trigger on
channels in more than one protection module or solely on channels of a PRM in a
different slot, it is strongly recommended always to use
disarm the entire rack at once.
The disarm status is stored in the backplane and will be recovered after a power cycle
or hot-swap procedure.
Channel Disarm

Channel disarm can be set through Local display selection keypad by selecting
CHANNEL ACTION then ARM/DISARM CH.
on each condition monitoring module.

It can also be set through Modbus register 258 as described in
Single) Modbus
The characteristics of channel disarm:

Latching cable fault is not triggered during channel disarm.

Latching cable fault issued before disarm is kept during channel disarm mode (user
must be sure to manually reset latching cable faults).

Alert relays go to state OK when associated channel(s) enter channel disarm mode.

Danger relays go to state OK when associated channel(s) enter channel disarm
mode.

Not OK relays go to state OK when associated channel(s) enter channel disarm
mode.

For the behavior of channel disarm relay, refer to the table
relays

For combined measurements, if the corresponding channel X or channel Y is in
channel disarm, then the combined measurement will be set to channel disarm.

Warning! Exercise extreme caution where N-out-of-N alarm logic is being used, as
any of those channels in disarm will mean that the condition will never be TRUE
(relay can never be triggered).
2 - 58
Register.
in Relays chapter.
rack disarm input
Local display selection keypad
Imported (Write
Behavior of channel status
SKF Multilog On-Line System IMx-M
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is located
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