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EM870S Digital Stepper Drive User Manual
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1. Introduction
The EM870S is a new digital stepper drive based on Leadshine’s widely implemented DM stepper drives (10+ millions
of units in field). While retaining features of simple design, easy setup, high precision and reliability, Leadshine has
also upgraded it by adopting the latest stepper control technology and added additional advanced features for better
torque (10-25%), quicker response time, control command smoothing, easy self-test, etc.
The EM870S is able to power 2 phase (1.8°) and 4 phase (0.9°) stepper motors smoothly with very low motor heating
& noise. It can take 20-80VDC supply voltage and output 0.5 to 7.0A current. All the micro step and output current
configurations can be easily done via built in DIP switches. Its control type (step & direction or CW/CCW) and
command smooth filtering can also be configured via DIP switches. Therefore, the EM870S is an ideal choice for
many applications requiring simple step & direction or CW/CCW control of NEMA 23, NEMA24 and NEMA 34
(lower than and including 4.5N.m motors) stepper motors.
1.1 Features

Step & direction (PUL/DIR) or CW/CCW (double pulse) control

20-80VDC supply voltage

200 KHz (500KHz optional) max pulse input frequency

16 microstep resolutions of 200-25,600 via DIP switches, or 200-51,200 via software (increase by 200)

8 output current settings of 1.4 -7.0A via DIP Switches, or 0.5-7.0A via software (increase by 0.1)

Configurable control command smoothing for reducing motor vibration

Idle current reduction to 50% or 90% selection via SW4

Convenient self-test for easy diagnosis

Auto-tuning to match wide-range NEMA 23, 24, 34 stepper motors

Anti-Resonance for optimal torque, extra smooth motion, low motor heating and noise

Soft-start with no “jump” when powered on

Optically isolated inputs with 5V or 24V

Fault and Brake output

Over-voltage, over-current and motor cable error protections

CE certified and RoHS compliant
1.2 Applications
The EM870S stepper drive is designed to power 2 phase (1.8°) or 4-phase (0.9°) NEMA23, 24 and 34 hybrid stepper
motors. It can be adopted in many industries (CNC machinery, electronics, medical, automation, packaging…) for
applications such as CNC routers, mills, plasma, laser cutters, factory assembly lines, vending machines, etc. Its
excellent performance, simple design, and easy setup features make EM870S ideal for many step & direction control
type applications.