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Step and Direction Stepper Drives
STR Series
PLACE ORDER - Sophisticated Current Control
•STR2: 2 A/phase
•STR4: 4 A/phase
•STR8: 8 A/phase - Anti-Resonance for Optimized Torque and Smoothness Over a Wide Speed Range
- Microstep Emulation for Creating Smooth Motion Even with Low-Resolution Step Signals
- Up to 20,000 Steps/Revolution
- Step and Direction or CW/CCW Pulse Operation
- Built-In Noise Filter on STEP and DIR Inputs
- Large Family of Compatible 2-Phase Stepper Motors
Description
Description
The STR series stepper drive is a compact,powerful, digital step and direction driveavailable in three power ranges: 2 A/phase, 4 A/phaseand 8 A/phase. The STR series is ideal forapplications requiring basic step anddirection control of a 2-phase step motor.STR drives feature advanced microstepping performanceand sophisticated current control with anti-resonance.Anti-resonance electronically damps motor and system resonances, which improves motor smoothness and torque over a wide speed range.
All setup is done via dip switches and arotary switch on the side of the drive,including motor selection, running current,idle current, and step resolution.
STR drives are available with a large familyof compatible 2-phase step motors, selectedto optimize performance of both the driveand motor.
NOTE: These drives require step pulses from a PLC or other controller.
SPECIFICATIONS
POWER AMPLIFIER SECTION (STR2)
Amplifier Type: MOSFET, dual H-bridge, 4 quadrant
Current Control: 4 state PWM at 20 kHz
Output Current: Up to 2.2 A/phase, depending on motor selection
Switch Selectable % of Maximum Current: 100%, 90%, 80%, 70%
Power Supply: External 12 to 48 Vdc power supply required
Idle Current Reduction: Reduction to 50% or 90%, switch selectable
POWER AMPLIFIER SECTION (STR4)
Amplifier Type: MOSFET, dual H-bridge, 4 quadrant
Current Control: 4 state PWM at 20 kHz
Output Current: Up to 4.5 A/phase, depending on motor selection
Switch Selectable % of Maximum Current: 100%, 90%, 80%, 70%
Power Supply: External 24 to 48 Vdc power supply required
Idle Current Reduction: Reduction to 50% or 90%, switch selectable
POWER AMPLIFIER SECTION (STR8)
Amplifier Type: MOSFET, dual H-bridge, 4 quadrant
Current Control: 4 state Pwm at 20 kHz
Output Current: Up to 8 A/phase, depending on motor selection Switch
Selectable % of Maximum Current: 100%, 90%, 80%, 70%
Power Supply: External 24 to 75 Vdc power supply required
Idle Current Reduction: Reduction to 50% or 90%, switch selectable
CONTROLLER SECTION
Mode Of Operation: Step and direction, Cw/Ccw
Microstep Resolution: Switch selectable: 200, 200 smooth, 400, 400 smooth, 2000, 5000, 12800, 20000 steps/revolution
Speed Range: Depends upon selected resolution; amplifier is suitable for speeds up to 50 rps
Anti Resonance: Raises the system damping ratio; eliminates midrange instability and allows stable operation to 50 rps
Waveform: Allows for fine adjustment of phase current waveform harmonic content to reduce low-speed torque ripple in the range 0.25 to 1.5 rps
Digital Noise Filter: Step pulse input: 150 kHz or 2 MHz, jumper selectable
Self Test Switch Selectable: Rotates motor 2 revolutions in each direction
Control Inputs: Step, direction, enable, optically isolated; 4 to 30 Vdc, 5 to 15 mA.
Step Input: Min pulse width = 250 ns; max pulse frequency = 2 MHz
Fault Output: Photodarlington, 80 mA, 30 Vdc max; voltage drop = 1.2 Vdc max at 80 mA
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