590 Series DC Digital Drive Programming
D-23
ANALOG INPUTS
The analog input block is used to scale and clamp the inputs for terminals A2 to A6.
NOTE
Terminal ANIN 2 (A3) is permanently connected to SETPOINT 2 (A3) in the
SPEED LOOP function block and to the Current Demand via I DEMAND
ISOLATE (the current demand isolate switch) in the CURRENT LOOP
function block.
To avoid interference with other drive functions when not required: the
parameter RATIO 2 (A3) (Tag 7 in the SPEED LOOP function block) must be set
to zero; and the I DMD. ISOLATE parameter (Tag 119 in the CURRENT LOOP
function block) must be set to DISABLED, i.e. selecting the Speed Loop as
shown in the Main Block Diagram.
Because ANIN 2 (A3) is scanned synchronously with the current loop (typically
every 3.3/2.6ms, 50/60Hz), it should be used for any signal whose response is
critical e.g. a trim input from an external positioning system or load share.
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