DC Servo Drive System Manual Ver: 0009
DC - 20/32
Maximum Speed: 1200 rpm
Example of calculation:
RAJFV (K
Ω
) =
RAJFV calculation:
This calculation is independent of whether the maximum speed is later limited with Max.Speed
or not.
This calculation is OK for velocity commands of ±10V.
If for example, the command is ±8V for a maximum speed of ±1200 rpm, the previous
calculation will result in a maximum speed of 1200·10/8 = 1500 rpm.
This RAJFV must be of 1/4 Watt
68,4 · 10
6
(Pulses/turn) · Nmax · 1.15
Encoder pulses per turn: 2500
RAJFV (K
Ω
) =
68,4 · 10
6
2500 · 1200 · 1.15
= 19.8 K
Ω
DCS-08 drive
Example of calculation:
RIT (K
Ω
) =
RIT calculation:
This RIT must be of 1/4 Watt
150
In · K
DCM41.20 motor : In = 4.72 Amp
- 10
where:
K = 0.39 (DCS-8)
K = 0.22 (DCS-14)
RIT (K
Ω
) =
150
4.72 · 0.39
- 10 = 71.5 K
Ω
"In" is the rated current of the motor according to the characteristics table or the current used in
a duty cycle considered nominal.
Adjustment of IM components for governing Non-Fagor motors
Maximum Speed: 1200 rpm
Tacho Constant: 20 V/Krpm
Example of calculation:
1200 · 1.3 · 0.02 = 31.2
RTV1 = 31.2 - 22 = 9.2 K
Ω
/ 0.25 W
RTV1 = Vmaxtac - 22 (K
Ω
)
Vmaxtac = Nmax · 1.3 · Ktac
RTV1 calculation:
This calculation is independent of whether the maximum speed is later limited with Max.Speed
or not.
This calculation is OK for velocity commands of ±10V.
If, for example, the command is ±8V for a maximum speed of ±1200 rpm, the previous
calculation will result in 1200·10/8 = 1500 rpm.
This RTV1 must be of 1/4 Watts
Graph for calculating the RTV1 resistor when
using a 20 V/Krpm tacho.
(the one carried by the Fagor motors mentioned
in this manual)
10
Nmax (rpm)
RTV1
(k
Ω
)
RTV1
(for Ktac = 20 V/Krpm)
1000
80
2000
3000
4000
20 30 40 50 60 70
Codes of the sales reference for the identity cards:
IDENTITY MODULE
Example: IM - 4120A - 14
IDENTITY MODULE
MOTOR TYPE
DRIVE TYPE
