Alpha Technologies Cordex Controller Ver.3.1x - Manual (Page 77)

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Example Five – Midpoint Voltage Error
The following is an example of a Custom Signal configured for an analog input (GP4) reading the mid-
point voltage of the battery (or system). A Custom Alarm is then configured to track the signal deviations.
For the Custom Signal equation, the midpoint volt-
age of the battery (from GP4) is doubled and then
subtracted from the total voltage reading provided
by the Battery Voltage signal. An absolute value
yields a positive integer.
Figure 80 — Controller Signals configuration example five (part one).
Configure custom signal for input reading midpoint voltage
To customize, review 7.1 Advanced Programming Example and 6.6.5.7 Custom Alarms. The text labels
can be edited using the web interface of the CXC and are provided here as default labels for demonstra-
tion purposes only.
For the Custom Alarm equation, the Custom Signal is
compared to the maximum* allowable voltage devia-
tion in battery string halves. In this example a mes-
sage is recorded when the midpoint voltage is in error.
* Some fine-tuning may be required to obtain the ideal
setting that is sensitive enough to detect a ‘bad’ cell
and will not produce false alarms.
Figure 81 — Controller Signals configuration example five (part two).
Configure custom alarm for input reading error
6.7.2.7 Midnight Rollover
The Scheduler (see Scheduler Usage and Custom Alarm examples above) functionality is simple. It
tests to see if the System Time is greater than the time entered by the user. This means that at midnight,
00.00.00, the user time is always greater than the System Time.
Example
So how can the scheduler be set up to ensure that this midnight rollover does not cause a problem with
any Custom Signal that uses the System Time? In real life, you might want to trigger a generator and keep
it on for some amount of time regardless of the midnight rollover.
These sample equations configure Custom Signal 1 to remain on for about 30 sec even if midnight roll-
over occurs.
Custom Signal 1 Equation:
([System Time (HH.MM.SS)] > <<23.59.55>> | [Custom Signal 1]) & ([Timer 1] < 29)
Timer 1 Equations:
Run Event: [System Time (HH.MM.SS)] > <<23.59.55>>
Stop Event: [Timer 1] >30
By this example, we see Custom Signal 1 go to 1.00 at 5 seconds to midnight, then go to 0.00 at about
25 seconds after midnight. This behavior repeats daily.