Elmo HARmonica, HARSFEN0602 software manual 162, Ecam

HARSFEN0602ElmoHARmonicaSoftwareManual PRELIMINARYDRAFT

12.2.1ECAM

ECAM is an acronym for “Electronic Cam”. It means that the position reference to the Amplifier is not directly proportional to the summed external inputs, but is a function of them.

The ECAM related commands are as follows:

EM[1]	Asserts whether the ECAM function is active.
	1 for active ECAM.
	0 for direct external referencing.
	Set EM[1] to 1 whenever a change is needed in EM parameters
EM[2]	The last valid index of the ECAM table.
	The maximum for EM[2] is 1024.
EM[3]	Starting position – the value of the input to the ECAM function for
	which the output of the ECAM function will be ET[EM[5]] (ET of
	EM[5])
EM[4]	Table difference.
	When the input to the ECAM table will be EM[3]+EM[4], the ECAM
	function will output ET[2].When the input to the ECAM table will be
	EM[3]+2*EM[4], the ECAM function will output ET[3], etc.
EM[5]	The first valid index of the ECAM table.
	Table 12-13 – ECAM Related Command

The input to the ECAM Table (IET) is composed from:

IET = ( (AG[3] * (Analog input 1 – AS[1])) + (FR[3] * Auxiliary Encoder) ).

As a result to IET the response may be:

-If IET < EM[3], the external position command (output of the ECAM table) will be ET[EM[5]].

-If IET > ( EM[3]+(EM[2]-1)*EM[4] ), the external position command will be ET[EM[2]].

-If EM[3]< IET < ( EM[3]+(EM[2]-1)*EM[4]), the external position command will be derived by linear interpolation of the ECAM table.

Example:

The parameters of the ECAM table are illustrated graphically in the figure below, for the case EM[5]=1 and EM[2]=4.

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