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TC Sensor Fail

This menu item enables the Supervisor to set an alarm when a sensor enabled for Temp Comp fails.

6.5.3.8Miscellaneous Alarms

Select heading to list

associated menu items

Select menu item to configure

Figure 42–Miscellaneous Alarms window showing menu items

Real Time Clock Error

This menu item enables the Supervisor to set an alarm when any change to the CXC’s clock occurs; due to a battery failure or the real time clock itself failing. The alarm will become active whenever the date is before Jan. 1, 2000 or after Dec. 31, 2030.

Invalid Device Firmware

This menu item enables the Supervisor to set an alarm in the event that the firmware of a device (e.g. Cordex rectifier) has become corrupt and is no longer functioning.

Ground Fault Detected (High Voltage CXC only)

This menu item enables the Supervisor to set the value at which the ground fault detected alarm will activate. The default value is +/-5mA.

Improper Controller Shutdown

This menu item enables the Supervisor to set an alarm in the event that the firmware of the controller has become corrupt and is no longer functioning.

Invalid Battery Voltage

This menu item enables the Supervisor to set an alarm when the charging voltage is invalid; e.g., in the event that the sense leads have become disconnected. The alarm activates when the charge volts signal drops below 5V and halts all control of the system that relies on this signal. If activated (enabled) an entry will be made in the event log.

System Major

This menu item enables the Supervisor to map a relay to the power system major alarm, which is activated if there are one or more active MAJOR alarms. A pull-down menu with scroll bars may be used for navigation.

System Minor

This menu item enables the Supervisor to map a relay to the power system minor alarm, which is activated if there are one or more active MINOR alarms. A pull-down menu with scroll bars may be used for navigation.

6.5.3.9ADIO Alarms

This menu item enables the Supervisor to configure the alarms associated with each ADIO device. Events occurring on one of the inputs can be programmed to the output alarm relays using the programming feature for the relay contacts similar to other alarms.

User (or Supervisor) may view the device status under the ADIO Alarms Detail menu, see 6.5.4.

6.5.3.10Custom Alarms (1-20)

This menu item enables the Supervisor to program 20 separate alarm-triggering equations into the CXC software. The equations may reference any combination (up to 16) of the analog inputs, digital inputs, virtual inputs, and alarms (such as Fan Fail) utilizing logical and arithmetic arguments that simulate the functionality of a programmable logic controller (PLC). See also 7.2 Equation Builder Keypads.

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Signal and a Numeric Value Selected

In this example, one signal (V1) and a numeric value (53.50) are selected for the Custom1 alarm to be triggered when [V1] > 53.50. The first operand chosen (top pull-down menu) is Analog Inputs. The next pull-down menu shows that the Supervisor must select from a list of inputs of that type. An operator is selected from the virtual keypad. The keypad is then changed to numeric in order to enter a numeric value to complete the equation.

Figure 43–Custom Alarm screen

Select Customize to program an alarm-triggering equation as described below.

At any time, as required, select the X icon to cancel entry and close window.

1.Inside the first window shown, after Customize is selected, is the equation building area, numeric keypad and other function keys. Select [Op] for operand (pull-down menu of alarms, signals, etc.).

2.Use pull-down menus to locate Analog Inputs: V1.

3.Select signal (e.g. V1) to add to equation builder.

4.Select Sym for arithmetic symbols (e.g. >) and logic operators and continue to build equation.

5.Select 123 to return to numeric keypad. Enter value (e.g. 53.50) to complete equation.

6.When equation is complete, select the check mark icon (in the lower right corner) to accept changes and return to previous window.

These notes correspond to the numbers in the sequence of figures below:

Figure 44–Customize Alarm example

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Example 1: Add More Rectifiers Alarm

The function of the following equation is to activate a custom alarm when load increases to a point where redundancy is compromised, but before any rectifiers go into power limit.

Enter the equation taking into consideration logic operators and the number and type of brackets used:

[Load Current] > ((([# Acquired Rectifiers]-1)*55)-5.5)

Where 1 is the number of redundant rectifiers, 55 is the max output current of a single rectifier before going into power limit (3kW PFM in this case), and 5.5 is the number of excess amps in the system required for battery float charging, LVD coils or anything that draws current from the rectifiers that is not the load.

Example 2: Generator ON/OFF Control

The function of the following equations will establish a pair of custom alarms that will activate one relay to start a secondary generator and another relay that stops the generator.

2a) Custom Alarm A to start a secondary generator:

( (V2 <= 46) & (D8 = 0) & (D7 = 0) ) | (V2 < 44.5)

When battery is discharged (system voltage (V2) is less than 46V) and primary (D7) and secondary (D8) generators are not on, OR system voltage is very low, activate. This alarm is exclusively mapped to a relay that is used to start the secondary generator.

2b) Custom Alarm B to stop a secondary generator: ( ( I2 <= 6 ) & (V2 > 53) & ( D8=1) ) | ( D7= 1)

When battery is charged (battery current (I2) is low and system voltage (V2) is near normal) OR primary (D7) generator is on, activate. This alarm is exclusively mapped to a relay that is used to stop the secondary generator.

Example 3: AC Voltage Reading in Mixed Rectifier Systems

The following scenario involves a CXC controlling Pathfinder 10kW rectifiers and Cordex 3.6kW rectifiers in a system with 277Vac. The CXC will compute the average AC reading of all rectifiers (for the AC MAINS HIGH/LOW alarms). In a PFM-CXR system, it may be desirable to have a separate AC alarm for each rectifier type.

To create separate alarms, first use the rectifier Phase Mapping feature (6.3.4) to assign each group of rectifiers to a different phase.

NOTE: the three individual phase voltages will no longer apply; instead, the average of the AC input voltage on each system would be given.

Next, disable the regular AC alarms (6.5.3.5).

Finally, create custom alarms using the average phase voltages. Here is one possible equation: ([Average AC Phase R] < 240) | ([Average AC Phase R] > 300)

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Scheduler Usage

The controller has basic scheduling capability that is implemented by using a System Time or System Date signal in any customizable equation; used to trigger external events on a timely basis, whether daily or at a specific date.

This is accomplished by using the System Time or System Date signal as an operator in a Custom Alarm equation, which has been configured to change the state of a relay output. The equation can include any other signals such as battery current or voltage for more advanced control. The System Time or System Date signal can only be used with the following operators: >, <, and =.

NOTE: the formats used for the Time and Date Operands are very specific and must match exactly in order for an equation to be valid. For the System Time the format is <hh.mm.ss>> and for System Date the format is <<20YY.MM.DD>>. The '20' prefix for the year is what distinguishes the date from the time so it must not be omitted when entering a Date Operand.

Example 1: The following equation in a Custom Alarm will cause the alarm to be true for ten seconds (10s) at 2:35AM:

[System Time (HH.MM.SS)] > <<02.35.00>> & [System Time (HH.MM.SS)] < <<02.35.10>> If the alarm is mapped to a relay, the relay will activate for 10s.

Example 2: Another example activates the alarm daily at 23:59:45 and clears when the battery voltage is less than 46V. This is the equation for the alarm named Custom 2:

(([System Time (HH.MM.SS)] > <<23.59.45>>) | ([Custom 2] > 0)) & ([Battery Voltage] > 46)

Note the term: ([Custom 2] > 0). This is to latch the alarm ON since the term: ([System Time (HH.MM.SS)] > <<23.59.45>>) will evaluate to false once the midnight rollover* (<<00.00.00>>) happens.

*Midnight Rollover is described with an example under Custom Signals.

Example 3: We can use the previous example along with a Counter to set the alarm to activate every three days. These are the equations for Counter 1:

Count Event "[System Time (HH.MM.SS)] > <<01.00.00>>" Reset Event "[Counter 1]>2"

The will cause Counter 1 to count once daily at 01.00.00. When the count gets to three, it is immediately reset back to zero. So, every third day, the count returns to zero.

Our Custom 2 alarm equation can now be:

(([System Time (HH.MM.SS)] > <<23.59.45>>) | ([Custom 2] > 0)) & ([Battery Voltage] > 46) & ([Counter 1] = 0)

The resulting behavior will be similar to that in Example 2, except the alarm will only activate once every 3 days.