Protections
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Part No. 057-129 DSE871x mono remote display ISSUE 2.1 21/09/2010 ADM
6.1 PROTECTIONS DISABLED
Not applicable to DSE8716 display
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.
6.1.1 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.
6.1.2 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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