29
Setting for Brush motor with armature (Continue)
RCA resistor calculations
Insert an RCA resistor on the header (ajustement zone) to compensate for voltage loss due to
the
motor resistance reducing the loss of RPM.
The formula is as follows:
RCA (Kohm) = 0,49 * 1000 * Vmot
Vref * Ipk * Ri
Where:
Vmot= Nominal voltage of the motor.
Ri=Max. cold motor resistance.
Ipk =Peak drive current.
Vref= max. applied reference voltage in VEL.
Example: Drive 7/14A, Ri=0,3ohm, Vmot=36V, Reference=10V
Calculate:
RCA (Kohm) = 0,49 * 1000 * 36 = 420K
10 * 14 * 0,3
Insert a 470Kohm resistance. If after insertion of the resistor the motor is unstable, increase
the Resistance value of RCA.
4.4 Current adjustement
RIN resistor (rated current adjustment)
Resistance RIN limits the value of the rated current supplied by the drive. Normally has the
same value, of the stall current of DC motor. For the calculation see the following table:
Example: on a converter 7/14A, inserting a resistance RIN 6.8Kohm the rated output current
will not be 7A, but 5.7A
Value of Rin in Kohm
Size drive (A)
Note * = No resistor mounted.
Rated Current request (A)
Rin value * 56 22 12 6,8 4,7 3,9 2,7 1,8 1,5 1
2/4
2
1,9
1,8
1,7
1,6
1,5
1,4
1,3
1,1
1
0,9
4/8
4
3,9
3,7
3,5
3,2
3
2,8
2,6
2,2
2,1
1,8
7/14
7
6,8
6,5
6
5,7
5,3
5
4,6
4
3,7
3,1
10/20
10
9,7 9,2
8,7
8,1
7,6
7,1
6,5
5,7
5,3
4,4
Содержание MDCA 100
Страница 1: ...1 MDCA XXX XX Precision Servodrive for DC motors...
Страница 2: ...2...
Страница 4: ...4 MDCA XXX XX...
Страница 36: ...36 V 1 0...
