EM870S, 7 A, Open-Loop Stepper Driver

Available for backorder
  • Weight
    0.25 kg
  • SKU

The EM870S open loop stepper driver is able to power 2 phase (1.8°) and 4 phase (0.9°) stepper motors smoothly with very low motor heating & noise. It can provide up to 7.0 A, operating at 20-80 VDC.

Buy more for less:
Quantity ex GST incl GST Saving
1-4 items $112.08 / each N/A  
5-9 items $100.87 / each N/A save 10%
10 or more items $95.27 / each N/A save 15%
  • $112.08

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 and 4 phase 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, NEMA 24 and NEMA 34 (lower than and including 4.5 N.m motors) stepper motors. EM870S can be a direct replacement for the EM806 (SMC-033).


  • 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

Input voltage: 20 to 80 VDC

Output current: 0.5 to 7.0 A

Pulse input frequency: 200kHz

Logic signal current: 7 to 16 mA

Isolation resistance: 500 MΩ

Operating environment:

  • Environment: Avoid dust, oil fog and corrosive gases
  • Storage temperature: -20 to 65°C
  • Ambient temperature: 0 to 65°C
  • Humidity: 40% to 90% RH
  • Operating temperature: 50°C Max
  • Vibration: 10-50Hz / 0.15mm

Weight: 250 g

Dimension: 118 x 75.5 x 34 mm

Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

Returns Policy

If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

Please note:

  • The product returned will attract a 20% restocking fee.
  • The customer must pay the delivery costs.
  • Non standard, custom made or a specially manufactured or imported products are not returnable.
  • Semiconductors, books and software are not refundable

Full Terms and Conditions

By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.

Related products

Drop items here to shop
Product has been added to your cart

Customers who viewed this product bought