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HARSFEN0602
12.2.1 ECAM
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.