General Information
Where x can be:
1.THERMISTOR
2.CURRENT
3.LINEAR
4.PRESSURE
5.UNALTERED
6.POLY_3RD
7.POLY_2ND
8.POLY_1ST
9.POLY_1ST_N1
10.POLY_1ST_N2
11.CAL_SCALE
12.CFM_SENSOR
13.GEN_FP_POLY
The function x may use any of the coefficients 1,2,3 and in some cases will use calibration factor as a 4th coefficient (in this case use scaling factor for calibra- tion). The coefficients are used to allow adjustment of the basic functions to cater for future or alternate sensors. They perform different tasks in different functions, see APPENDIX A for further details. Note that if calibration factor is used as a coefficient, it will be shown (and entered) by GenLink as (actual coef- ficient/1024).
For example, if the coefficient is
THEN
M =M * Scaling Factor:
Where scaling factor is a number such that 1024 is equivalent to 1, so it’s really M * scaling factor/1024. GenLink will hide this computation so you can enter floating point numbers such as 2.1 or 0.987 etc.
ANALOG ALARMS
Each of the 23 channels is processed by a set of alarm rules using constants that are set via GenLink. Usually these constants can be changed by the customer. Note that all alarms will be entered into the alarm log and will operate the audible alarm. Warnings will operate the audible alarm also, and will be put in the alarm log. The following list shows the alarm properties.
Types
This section is used to turn alarms and warnings on or off and define if the input must be greater than a value (GT) or less than a value (LT). There can be up to 2 alarms and 2 warnings, of which there can be a maximum of 2 GT or LT types.
Setpoints
There can be up to 4 setpoints to support 2 alarms and 2 warnings, of which there can be a maximum of 2 GT or LT types. The setpoints are in the same units that the measurement is displayed in.
Delay Time
There are 2 delay fields that can be set with differ- ent times in each. Any or none of these times can be applied to any of the alarms or warnings via GenLink radio buttons.
For example, a measurement may have to be greater than the setpoint for 1 second to cause an alarm, or less than another setpoint for 2 seconds to cause a warning. The resolution of this time interval is 0.1 seconds.
Hysteresis
Applied hysteresis in display or final units (for exam- ple battery voltage is displayed in units of 1/100ths of a volt). When an alarm/warning has gone active, the hysteresis is subtracted from the GT setpoint or added to the LT setpoint to calculate the modified setpoint needed to make the alarm go inactive.
Shutdown
When set, this alarm condition (alarms only, not warnings) has been selected to shutdown the engine.
Dialout
When this field is set, the dialout feature is selected. If an alarm or warning occurs for this channel the processor will automatically call for assistance via telephone (if the external modem option is fitted). Dialout can be selected either for warnings, alarms, neither, or both. There is a predefined and prioritized list of 10 phone numbers that will be tried. The con- troller expects GenLink to answer the call and log the fault. It is possible for the customer to program any Modbus device with a modem to respond to the call.
Active When
You can select other criteria to determine when alarms and warnings become active. This is further divided in that you can define these criteria indepen- dently for LT and GT alarm types.
ALWAYS ENABLED = This alarm or warning is always enabled under every circumstance.
HOLD OFF = Alarms/Warnings with this qualifica- tion only become active after a programmable hold off time has been met. The hold off timer starts after the engine has started. Stopping the engine cancels the hold off timer.
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