
Protection
Protection Part Operation
2 - 52
SKF Multilog O
n-Line System IMx-M
User Manual
Disarm
There are three different types of disarm;
•
•
•
Important - In order to engage disarm when relays are configured to trigger on
channels in more than one protection module, it is strongly recommended always
to use rack disarm input to 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
. Local display selection keypad is located
on each condition monitoring module.
•
It can also be set through Modbus register 258 as described in
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 st
ate 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
•
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.
Slot Disarm
Slot disarm effects relay module (RLM) and protection module (PRM).
Slot disarm can be set through one of the following:
•
Via the local display selection keypad which is located on each condition monitoring
module, as shown in Condition Monitoring Module (CMM).
For detailed information refer to Local Display and Local Display Selection Keypad
chapter
.