94 ● FV DMC-1400 Series Command Reference
FV FUNCTION: Velocity Feedforward
DESCRIPTION:
The FV command sets the velocity feedforward coefficient, or returns the previously set
value. This coefficient generates an output bias signal in proportion to the commanded
velocity.
Velocity feedforward bias = 1.22 ⋅ 10-6 ⋅ FV ⋅ Velocity [in ct/s].
For example, if FV=10 and the velocity is 200,000 count/s, the velocity feedforward bias
equals 2.44 volts.
ARGUMENTS: FVn where
n is an unsigned number in the range 0 to 8191 decimal
“?” returns the feedforward velocity for the specified axis.
USAGE:
While Moving Yes Default Value 0
In a Program Yes Default Format 3.0
Command Line Yes
Can be Interrogated Yes
Used as an Operand Yes
Controller Usage ALL
OPERAND USAGE:
_FV contains the feedforward velocity.
RELATED COMMANDS:
FA Acceleration feedforward
EXAMPLES:
FV 10 Set feedforward coefficients to 10
JG 30000 This produces 0.366 volts.
FV ? Return the value
010