DMC-18x6 Command Reference
95
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 proportions to the commanded velocity.
Velocity feedforward bias = 1.22
10-6 FV Velocity [in cts/s].
FV operates when commanding motion with PA, PR, JG, VM, LM, and CM.
For example, if FV=10 and the velocity is 200,000 count/s, the velocity feedforward bias equals
2.44 volts.
ARGUMENTS: FV n,n,n,n,n,n,n,n or
FVA=n where
n is an unsigned numbers in the range 0 to 8191 decimal
n = ? Returns the feedforward velocity for the specified axis.
USAGE: DEFAULTS:
While Moving
Yes
Default Value
0
In a Program
Yes
Default Format
4.0
Command Line
Yes
Controller Usage
ALL CONTROLLERS
OPERAND USAGE:
_FVn contains the feedforward velocity for the specified axis.
RELATED COMMANDS:
Acceleration feedforward
EXAMPLES:
FV 10,20
Set feedforward coefficients to 10 and 20 for A and B respectively
JG 30000,80000
This produces 0.366 volts for A and 1.95 volts for B.
FV ?,?
Return the A and B values.
010,020
