U Page 41
Digital controller RK 4004
.5.2. accel. time
This function is only possible in "manual offset" mode.
In manual mode the actuator is positioned with the positioning veloci-
ty set in parameter ".1.8. velocity jog".
With this ramp function ".5.2. accel. time" an acceleration time of 0 to
the maximum motor speed may be entered. The actuator drive thus
reaches its maximum motor speed after a set time. The motor speed
is increased linearly. Equally, the actuator comes to a standstill after
the same ramp function.
In the fig. opposite the motion speed progression of an actuator is
displayed with a set ramp function of 3 seconds. The key for the ma-
nual offset has been pressed for 5 seconds in this example. The bro-
ken line progression indicates the positioning velocity progression wit-
hout ramp function.
.5.3. I-PWM
The actual I-PWM value (pulse-width-modulated) is displayed. The
display is only of significance for internal tests.
.5.4. reserved 54
Not assigned at present.
.5.5. current controller
Parameter block for setting the current controller.
.5.6. cut-off current
Once the set value is exceeded the motor output stage is switched
off. This value should be twice as much as the motor nominal current
(parameter ".5.7. motor current").
Error display 3 is output as error in parameter ".6.9. system error".
If the current fails to reach the set value the motor output stage will
be re-enabled.
.5.7. motor current
The motor nominal current specified on the DC actuator drive type
plate should be set here. If set too high the motor current may over-
load or even destroy the DC actuator drive. Please also refer to the
table in chapter 6 in order to establish the current value.
Positioning
velocity
Time
Positioning
velocity without
ramp function
Positioning
velocity with
ramp function