Download B - Schneider Electric

A
Appendix
A
Determining Parameters
VMAX parameter: Maximum operating velocity
This is closely related to the selected resolution and can never exceed a value
corresponding to an input frequency of:
● 36 kHz for a TSX AXM 172 module,
● 72 kHz for TSX AXM 182 / 162 modules.
UMAX and LIMV parameters:
UMAX is the voltage that must be applied to the input of the speed drive to
obtain a velocity equal to VMAX.
As far as possible, set the speed drive to obtain the maximum velocity VMAX
at a voltage that is as close as possible to 9 V without exceeding this level.
Restricting the voltage to 9 V means that during speed transition periods
there is enough of a reserve to allow a temporary overvoltage. The amplitude
of this overvoltage is determined by the LIMV value: If there are no mechanical
restrictions, caused either by the maximum acceptable frequency or by the
module, the following values should be selected:
UMAX = 9 V and LIMV = 10 %.
Example:
To control an axis with the following characteristics:
Motor
Moving part
(Max. velocity: 30 mm/sec.)
1000 pts/rev.
Encoder
1/5 reduction gear
The maximum linear velocity is 30 mm/sec. or 1800 mm/minute.
The axis is driven by a motor that can run at 3000 rpm, driving a screw via a
1/5 reduction gear. The encoder is located on the motor shaft. An open
collector encoder output is assumed (requiring the use of a TSX AXM 172
module).
● The Resolution parameter (distance traveled by the moving part between
two encoder increments) is equal to:
Me
●
●
●
●
Pitch = 1 x 5 = 1 µm
N
5 1000
The VMAX maximum operating velocity parameter is 1800 mm/minute.
Assuming it is possible to adjust the speed drive to obtain maximum velocity
at a level of 9 V on the input to the speed drive.
The UMAX parameter is therefore 9 V.
A 10 % overvoltage during transition to full speed is allowed.
The LIMV parameter is therefore 10.
Coherence of the RESOL, VMAX and UMAX parameters must absolutely
be ensured or incoherent results will be obtained from the servo loop during
normal operation.
A/3
B