Axor Minispeed MS 140, Руководство по обслуживанию, Страница: 27 / 36

Service Guide MINI SPEED Service Guide MINI SPEED
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Adjustment on the personality header
RA RESISTANCE pin 2 - 13
ACC/DEC RESISTANCE pin 3 - 12
It gives ACC/DEC time.When we insert this resistance
we must close solder bridges JP1,JP2 and JP8(see
page 29).
Use this resistance only armature feedback .It permit
adaptament at the costant motor tension .For enable
the armature feedback close solder bridge JP6(see
page 27).
IN RESISTANCE pin 4 - 11
It gives limitation of the rated current value.(see page
28)
IP RESISTANCE pin 5 - 10
It gives limitation of the peak current value.(see page
29)
RCA RESISTANCE pin 6 - 9
Compensation of the internal motor voltage due to
RI resistance of motor.
We insert it when use armature feedback (see page
27),if not inserted we have a speed decreasing from
no load to load working.
ADJUSTMENT VELOCITY IN
ARMATURE FEEDBACK
Armature voltage can be used as velocity feedback,
when motor has not tachogenerator .
The armature feedback system has less precision
than a tachogenerator.(range 1/20 and when the
motor is stopped it has no torque).
For enable this function close solder bridge JP 6 and
open solder bridge JP 10(disable tachogenerator
alarm).
Insert RA resistance on the header between pin 2-
13 for adapt system at the voltage motor costant.
The value of RA resistance can be calculated using
the following formula:
E = n x Ke
1000
Ke= fcem at 1000
rpm.
Vref = max. Voltage
reference
n=max desired
speed expressed in
rpm
MS 60 RA(k ohm) = 166 x Vref
E - 1,4 Vref
MS 140 RA(k ohm) = 159 x Vref
E - 3,3 Vref
MS 200 RA(k ohm) = 158 x Vref
E - 5 Vref
KE MOTOR=50V n=4000 giri/min Vref=10V
E = 4000 x 50 = 200
1000
MS 200 RA(k ohm) = 158 x 10 = 10.5 Kohm
200 - 5 x10
So the value of the resistance is 10 k.
We will obtain fine speed operating with vel potentiometer on front panel.
Insert
RCA resistance
between pin 6-9 of the header for compensate internal RI of
the motor.
Use the following formula for determining the value.
n = max. speed in rpm.
Ra total resistance (cold).
Ipk peak current of driver size.
Amplifier 10/20 A , Ra=2.5 ohm
RCA (k ohm) = 0,45 x 4000x50 =180 Kohm
10x20x2.5
Use 180 Kohm resistance or a
bit higher .
I If after this operation motor is instable,a bigger commercial resistor value must be
choosen,changing the previous one.
2
13
3
12
6
9
5
10
4 11
RCA (k ohm) = 0,45 x n Ke
Vref Ipk Ri