Function Blocks
ALT Alternator Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 57
2/07
GENERAL tab
Style selections
A style is a method used to control the cycling of the 16 outputs. There are four styles from which to
choose: Direct, Rotary (Last ON/First OFF), First ON/First OFF (FOFO), or Fixed (with Advance feature).
This parameter is initially configured here and can be altered from an operator interface.
Important: A style change request does not take effect until all inputs (IN1 - 16) are OFF.
DIRECT Monitors up to 16 inputs and maps them, using the user adjustable map order on the Output
tab, directly to the outputs.
If the Inputs selected are 1, 2, 3, 4, 5, 6 and the Output order mapped is 6, 3, 4, 1, 5, 2; when
Input 3 is activated, Output 4 is enabled; or if Input 1 is activated then Output 6 is enabled.
ROTARY Uses the sum of the 16 inputs that are set to ON to determine the required demand for outputs.
The output order is managed in a Last ON/First OFF basis (LOFO).
If the Inputs selected are 1, 2, 3 and the mapped sequence is 1, 2, 3 the alternator sequence
changes when NO outputs (pumps) are required or there is a request to Advance (see Activate
Advance).
Depending on the capacity required, Outputs 1, 2, 3 come on in order. When the demand falls,
Output 3 goes OFF, then Output 2, then Output 1. When Output 1 turns off, the Rotary
sequence advances and Output 2 starts the next cycle.
If an input pin is set to “not available”, then that output is forced to OFF and the next available
output in the mapping order is turned ON. If the previously bypassed output later becomes
enabled, then it will not be used until the demand increases.
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