Protections
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8.1 PROTECTIONS DISABLED
User configuration is possible to prevent Shutdown / Electrical Trip alarms from stopping the engine.
Under such conditions, Protections Disabled will appear on the module display to inform the operator
of this status.
This feature is provided to assist the system designer in meeting specifications for “Warning only”,
“Protections Disabled”, “Run to Destruction”, “War mode” or other similar wording.
When configuring this feature in the PC software, the system designer chooses to make the feature
either permanently active, or only active upon operation of an external switch. The system designer
provides this switch (not DSE) so its location will vary depending upon manufacturer, however it
normally takes the form of a key operated switch to prevent inadvertent activation. Depending upon
configuration, a warning alarm may be generated when the switch is operated.
The feature is configurable in the PC configuration software for the module. Writing a configuration to
the controller that has “Protections Disabled” configured, results in a warning message appearing on
the PC screen for the user to acknowledge before the controller’s configuration is changed. This
prevents inadvertent activation of the feature.
8.1.1 INDICATION / WARNING ALARMS
Under Indication or Warning alarms:
• The module operation is unaffected by the Protections Disabled feature. See sections entitled
Indications and Warnings elsewhere in this document.
8.1.2 SHUTDOWN / ELECTRICAL TRIP ALARMS
NOTE: The EMERGENCY STOP input and shutdown alarm continues to operate even
when Protections Disabled has been activated.
Under Shutdown or Electrical Trip alarm conditions (excluding Emergency Stop):
• The alarm is displayed on the screen as detailed in the section entitled Shutdown alarms
elsewhere in this document.
• The set continues to run.
• The load switch maintains its current position (it is not opened if already closed)
• Shutdown Blocked also appears on the LCD screen to inform the operator that the
Protections Disabled feature has blocked the shutdown of the engine under the normally
critical fault.
• The ‘shutdown’ alarm is logged by the controllers Event Log (if configured to log shutdown
alarms) and logs that the Shutdown was prevented.
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