Protection
Protection Module Configuration with IMx-M Manager
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SKF Multilog O
n-Line System IMx-M
User Manual
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When the relay is set for "Latching" and the relay is activated, it will stay in that
state until it is reset. Resetting can be done via either:
–
The Digital Channel interface by selecting Latching alarms reset type
–
The Local Display selection keypad on the front of the condition monitoring
module
–
Modbus Register 261 as described in
Imported (Write Single) Modbus Register
–
Via Ethernet connection from @ptitude Observer
Having to manually reset a fault condition ensures that all such conditions have to
be acknowledged and acted on by someone.
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Enter Delay
This represents the time in milliseconds that an alarm or danger condition has to
exist before the selected relay is activated into its alarm state.
Channel Alarm Enter time + Relay Enter Delay will be the total
Enter Time for triggering the relay.
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Leave Delay
This represents the time in milliseconds after an alarm or danger condition has
ended before the selected relay is deactivated from its alarm state.
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Channel Setup
Channel setup options are basic channel setup voting based on "n out of n" logic.
Detailed information is provided in the next section, Channel Setup for Relays.
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Power Supply Unit 1 / Power Supply Unit 2
.
These are only for the Power Supply Failure Indicator type.
This selection controls upon which a power supply unit failure relay shall be
activated.
Channel Setup for Relays
Although a relay module configuration is associated with a particular slot (CMM + PRM
pair) number, each of the 32 relays on that relay module can trigger on a channel alarm
condition across all four protection modules.
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 alert condition triggering is based on simple Boolean logic, based on polling of the
candidate alarm states for different channel combinations, and these combinations can
be spread across all four protection modules.
Basic channel setup voting is based on simple “n out of n” logic (for example 1 out of 3);
the concept of which is shown in the figure below.