Tabla de contenido
Publicidad
A
8
100
10
1
0.
1
A. Max running frequency
/ base frequency
A. max. Lauffrequenz /
Grundfrequenz
A. Frecuencia de marcha máxima
/ frecuencia base
A. Fréquence maximale de
fonctionnement /
fréquence de base
9
A
B
Min.
A. Max. running frequency
B. Base frequency
C. VR2 setting
A. max. Lauffrequenz
B Grundfrequenz
C. VRE-Einstellung
A. Frecuencia de marcha máxima
B. Frecuencia base
C. Ajust de VR2
A. Fréquence maximale de
fonctionnement
B. Fréquence de base
C. Réglage de VR2
VR1 + 10kΩ
R26
10
100
A. Frequenza di esecuzione max.
/ frequenza di base
DK
A. Maks. kørselsfrekvens
/ grundfrekvens
NL
A. Maximale bedrijfsfrequentie/
basisfrequentie
SE
A. Max. driftfrekvens/
grundfrekvens
C
Max.
A. Frequenza di esecuzione max.
B. Frequenza di base
C. Impostazione VR2
DK
A. Maks. kørselsfrekvens
B. Grundfrekvens
C. VR2-indstilling
NL
A. Maximale bedrijfsfrequentie
B. Basisfrequentie
C.VR2 instelling
SE
A. Max. driftfrekvens
B. Grundfrekvens
C. VR2-inställning
Max. power dissipated through R = (rated motor current) 2 x R. If the power
dissipation is high it is advisable to arrive at the required value of 'R' by using
a network of series or parallel resistors. (The use of higher wattage resistors
and heat sinks may be required).
Max. current consumption (motor & board) = 2 x (current per phase) + 60mA.
Thus ensure power supply cables used are sufficiently rated.
External control signals e.g. full/half step, direction etc. as well as the
oscillator (if fitted) stop/run signal can be applied to the circuit in any of the
methods
Figure 2.
of
Connection to RS stepper motors
When the winding of the RS stepper motors are assigned (Ø1 - Ø4) as shown
in Figure 3, they can be connected to the board according to Figure 1.
If the supply voltage is set to 24Vdc then 'R' values for use with the RS motors
are given in table 1 below.
Table 1
Rated
Motor
Current
(A)
332-947
0.1
332-953
0.24
440-464
2
For other details and motors performance refer to RS data sheet on stepper
motors.
On-board oscillator assembly
If external clock source is not available, on-board oscillator can be assembled
simply by soldering into place the required RS Components listed below.
Note : the oscillator clock output must be externally wired to the clock, input-
pin 24a.
If oscillator remote controls are required (e.g. front panel controls) then plug
PLI (5-way inter p.c.b. RS stock no.467-576) can be added together with
mating cable shell (RS stock no. 467-627) and crimp terminals (RS stock
no.467-598)
Starting (base) and running speed control
The on-board oscillator can be arranged to start at a fixed frequency (thus a
fixed motor speed) and then ramp up to a final value (the running motor
speed). This facility is available to start the motor within its pull-in performance
region and then accelerate the motor through so that it can operate within the
pull-out mode. On switch-off the motor decelerates automatically.
Three parameters need to be determined for any application :
a) The starting speed: this should be below the pull-in speed for the motor
(with any additional load).
b) The running (final) speed: this should be within the pull-out capability of
the motor (with any additional load).
c) The acceleration and deceleration rate between starting and running
speeds: this is limited by motor capability to accelerate through its own
(plus any load) inertia.
Oscillator controls (external)
Note : Oscillator frequency corresponds directly to motor speed in step/s or
half step/s depending on motor drive mode.
For a 1.8˚ stepper motor :
speed in revs / min =
60 x speed in step/s
200
or
speed in revs / min =
60 x speed in 'half' step/s
400
For a 7.5˚ stepper motor :
speed in revs / min =
60 x speed in step/s
48
or
speed in revs / min =
60 x speed in 'half' step/s
96
V6771
RS Stock No.
Rated
R
Power
Winding
(Ω)
Dissipation
Voltage (V)
through R (W)
12
120
12
47
3
10.5
217-3611
1.2
3
5
5
Publicidad
Tabla de contenido
