Sure
Step
TM
Stepping Systems User Manual
3–7
Chapter 3:
Sure
Step
TM
STP-DRV-4035 Microstepping Drive
5th Ed., Rev. B 01/2019
Further information about braking accessories and regeneration clamping can
be found in Appendix A and the STP-DRVA-RC-050 REGENERATION CLAMP
datasheet.
Connecting the Logic
The SureStep drive contains optical
isolation circuitry to prevent the electrical
noise inherent in switching amplifiers
from interfering with your circuits. Optical
isolation is accomplished by powering
the motor driver from a different supply
source than your control circuits. There
is no electrical connection between the
two; signal communication is achieved
by infrared light. When your circuit turns
on or turns off, an infrared LED (built
into the drive), signals a logic state to the
phototransistors that are wired to the brains
of the drive. A schematic diagram input
circuit is shown to the right.
You will need to supply a source of step pulses to the drive at the STEP+ and STEP–
terminals and a direction signal at the DIR+ and DIR– terminals, if bidirectional
rotation is required. You will also need to determine if the
ENABLE
input terminals
will be used in your application. Operation, voltage levels and wiring on the
ENABLE
terminals is the same as the
STEP
and
DIRECTION
terminals. The EN+
and EN– terminal can be left not connected if the enable function is not required.
All logic inputs can be controlled by a DC output signal that is either sinking (NPN),
sourcing (PNP), or differential.
On the next couple of pages are examples for connecting various forms of outputs
from both indexers and PLCs.
Internal to the
STP-DRV-4035
Drive Input Circuit
220 ohms
220 ohms
STEP+
STEP–
