35
4 Functional Description
4.4 Enhanced operating modes
Use the CONTMOD command to revert from an enhanced operating mode to normal mode.
4.4.1 Stepper motor mode
Command Function
Description
STEPMOD Stepper motor mode
Change to stepper motor mode
In stepper motor mode, the analog input acts as frequency input. The error output must be config-
ured as rotational direction input if the direction of rotation is to be changed via a digital signal.
Alternatively, the direction of rotation can also be preset via the commands ADL and ADR.
Command Function
Description
DIRIN
Direction Input
Fault pin as rotational direction input
The drive moves one programmable angle further for each pulse at the analog input, and thus simu-
lates the function of a stepper motor.
There are a number of considerable advantages in comparison with a real stepper motor:
The number of steps per revolution is freely programmable and of a very high resolution (encoder
resolution)
The individual step widths are freely programmable
No detent torque
The full dynamics of the motor can be used
The motor is very quiet
The motor monitors actual position so that no steps are “lost” (even with maximum dynamics)
No motor current flows in settled state (actual position reached)
High efficiency
The control electronics are already integrated in the 3564K024B CS
Input:
Maximum input frequency: 400 kHz
Level: 5 V TTL or 24 V PLC-compatible, depending on configuration.
Stepper motor mode enables position-accurate velocity control; any rational ratios can be set for
input frequency to motor speed, via step width and step number, in accordance with the following
formula:
Revolutions = pulses
STW
STN
Revolutions
… Revolutions that are generated on the drive
Pulses
… Number of pulses at the frequency input (=number of steps)
STW
… Step width (step width factor = number of steps per encoder pulse at the fre-
quency input)
STN
… Step number (number of steps = number of steps per revolution)
Value range of STN and STW: 1 to 65 535
Command Function
Description
STW
Load Step Width
Load step width for step motor and gearing mode
STN
Load Step Number
Load number of steps per revolution for step motor
and gearing mode