Axor Microspeed Plus 140, Руководство по обслуживанию, Страница: 52 / 64

52
Service Manual
Plus
MICROSPEED
RCA (k ohm) = 0,5 x n Ke
Vref Ipk Ri
RCA resistor It will be mounted on the socket , to compensa-
te for the voltage drop due to the motor’s internal resistance.
To calculate it,use this equation:
Use a resistor of 200 Kohm or the higher value.
RCA (kohm) = 0,5 x 4000 x 50 =200 Kohm
10 x 20 x 2.5
Example: Drive 10/20 A , Ri= 2.5 ohm
If,after this procedure the motor is unstable increase the value by
using the next (higher) commercial value avalaible.
WHERE:
n= max. speed expressed in rpm.
Ri=Total motor resistance with brushes.
Ipk =Peak current, (size)of the drive.
Ke=Sevomotor BEMF at 1000 rpm.
Vref= Max voltage reference.
Adjustments
5.4 Speed adjustment with Armature feedback
5.5 Adjusting Speed Balance (Offset)
The Microspeed Plus is provided with a
BIL
potentiometer
that allows the motor to be adjusted to zero speed when 0.0
Vdc is applied to the +REF. Re-adjust the Bil trimmer to correct
eventual system offset. (You may comp/- 200mV from
reference input). With the reference input at Zero turn the
BIL
potentiometer until the motor stops moving.
VEL
BIL
ACC