DIGIVEX Little Drive Servoamplifier
11
PVD 3530 GB 01/2005
On the right of the diagram, the motor - resolver - power section.
Parameters can be set for:
⇒
the choice of motor, which dictates the drive rating.
⇒
the general characteristics of the resolver.
The choice of the motor - drive combination determines a number of parameters: current
limitation, I
2
= f(t) protection, standard servo-control parameters.
Ahead of current control.
♦
Second order filter for reducing the effect of high-frequency resonance
♦
External reduction of current limitation
Resolver numerical processing (non parametric) and the encoder emulation function (number of
lines adjustable from 1 to 16384).
Choice of type of regulation: torque or speed.
In speed loop. Parameters can be set for :
⇒
maximum speed for the application (limited by the maximum motor speed).
⇒
scaling (1 V = N rpm).
⇒
choice of corrector type: proportional, proportional and integral, proportional and
double integration.
Predictive actions associated with speed control.
These actions, acting outside the speed loop, directly affect torque. As they are external they
have little effect on loop stability. However, they allow anticipated actions, without waiting for the
speed loop reaction.
The predictive actions (or predictors) are:
Gravity: compensation for vertical masses.
Dry friction: a friction force value is fixed. The corresponding torque set point is applied, its sign
being that of the speed set point.
Viscous friction: compensation for friction forces that are proportional to speed (hydraulic or
electrical system drive).
Acceleration: changes in the speed set point (drift) are monitored and direct action is taken on
the torque set point via a coefficient K, the inertia image.
The analog input
speed reference (13 bits + sign), non parametric.
On the left of the block diagram
, the set of logic and analog inputs / outputs.
The parameter setting software is used:
for allocating some of these Inputs / Outputs.
for forcing them to a logic status. The inputs are then disconnected from the outside.
This manual was downloaded on www.sdsdrives.com
+44 (0)117 938 1800 - [email protected]
