Speed Alarms: Difference between revisions

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(Created page with "The EIM and associated modules are capable of identifying a wide range possible alarm conditions. Depending on the module there are a set of custom and fixed alarms in the system to generate an alarm event for the error condition. See the “ALARMS” section of any of the modules for details on how to configure an alarm. As discussed in the module alarm sections, most alarms can be set up to close the error relay and shutdown the engine on critical alarms (other than an...")
 
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The EIM and associated modules are capable of identifying a wide range possible alarm conditions. Depending on the module there are a set of custom and fixed alarms in the system to generate an alarm event for the error condition. See the “ALARMS” section of any of the modules for details on how to configure an alarm. As discussed in the module alarm sections, most alarms can be set up to close the error relay and shutdown the engine on critical alarms (other than annunciator, which shuts down the engine directly).
The Governor Alarm Setup page (Pg. 522) specifies alarms for RPM and pressure sensors. An access level of ''Setup'' or higher is needed to see this screen.
 
Active alarms will cause the “Alarms” button in footer of the display to show the number of current alarms and flash the text. Selecting this button will navigate to the Alarms screen (Pg. 40) that displays the current alarms with their associated date/time stamp, alarm code, description, and action taken.


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Selecting the “View” button of the associated active alarm navigates to the View Alarm screen (Pg. 41). This screen displays the alarm in additional detail and provides the option to clear the alarm by pressing the “Reset Alarm” button or examine the configuration of the alarm by selecting the “Go To Setup” button. This screen also has a “Sensor Snapshot” button to see a snapshot of the sensors for the given module at the time the alarm occurred.
''Governor Alarm Setup''


If an alarm covers a single sensor value high or low trigger, selecting "View" will go to a graph showing the value of that sensor for the minute before the alarm.
The RPM alarm values duplicate the settings from setup step 1. These specify the low and high shutdown values for the engine. If an underspeed is not needed, it can be set to 0.
 
Note: Most alarms are only active if the run signal is in the “Run” condition and the alarm timer on the home page has expired. If the Run Signal Trigger is not properly configured an alarm condition could be missed.
===ALARM HISTORY===
The alarms screen has a button “Alarm History” which brings up the Alarm History screen (Pg. 42) a list of all past alarms that have been acknowledged (cleared). The “< Prev” and “Next >” buttons at the bottom of the screen can be used to scroll through the list of past alarms. Clicking on “View” on an alarm will show the details for the given past alarm.
===SENSOR SNAPSHOT===
For active alarms, a sensor log is saved for 60 seconds of data during the time leading up to the alarm. This log can be downloaded by inserting a USB drive and selecting 'Download'.
 
For past alarms, a button is present to view the sensor snapshot at the time of the alarm (shown below). This list shows only the sensors at the time of the alarm (not the full 60 seconds).
 
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If an alarm pulls up the alarm graph display instead, the sensor snapshot can still be downloaded by inserting a USB drive.
Each of the three pressure inputs can have an alarm set up for it. To enable an alarm, click the enable “X” on that row, which will allow the parameters for that sensor to be changed. A low alarm, high alarm, and duration can be specified. If the sensor is outside the operating range for longer than the duration, an alarm will be triggered. If the action selected under “Action” is “Warning,” then triggering the alarm only adds the event to the Alarms screen. If the action is “Shutdown,” then the engine will be shut down in addition to adding the event to the alarm screen.


Note that the Alarm History page will show all past alarms that occurred on the EIM. The Alarm Snapshot data will only be saved on EIM versions 1.58 or newer, so some past alarms may not have sensor snapshot information. The one minute of snapshot data will only be available for active alarms. Once an alarm is reset, the history page will only show the snapshot for the moment the alarm occurred.
Note: If a “Shutdown” alarm is needed, the alarm relay on the Governor circuit board should be connected to an annunciator panel. During a shutdown the relay is closed to kill the engine. Additionally, the Governor will close the throttle, but this does not guarantee an engine kill.

Revision as of 17:49, 21 July 2022

The Governor Alarm Setup page (Pg. 522) specifies alarms for RPM and pressure sensors. An access level of Setup or higher is needed to see this screen.

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Governor Alarm Setup

The RPM alarm values duplicate the settings from setup step 1. These specify the low and high shutdown values for the engine. If an underspeed is not needed, it can be set to 0.

Each of the three pressure inputs can have an alarm set up for it. To enable an alarm, click the enable “X” on that row, which will allow the parameters for that sensor to be changed. A low alarm, high alarm, and duration can be specified. If the sensor is outside the operating range for longer than the duration, an alarm will be triggered. If the action selected under “Action” is “Warning,” then triggering the alarm only adds the event to the Alarms screen. If the action is “Shutdown,” then the engine will be shut down in addition to adding the event to the alarm screen.

Note: If a “Shutdown” alarm is needed, the alarm relay on the Governor circuit board should be connected to an annunciator panel. During a shutdown the relay is closed to kill the engine. Additionally, the Governor will close the throttle, but this does not guarantee an engine kill.

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