EM503 Digital Stepper Driver with Stall Detection

EM503 Digital Stepper Driver with Stall Detection

SKU: SMC-031

The EM402 is an advanced stepper motor driver with features including electrical damping, anti-resonance, start-up smoothing, multi-stepping and sensorless stall detection. 20 to 48 VDC powered with output current up to 4.2 A peak.

  • Manufacturer: Leadshine
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By implementing advanced DSP current control algorithm, Leadshine EM503 is a advanced high performance 2-phase digital stepper drive. It takes step & direction or CW/CCW control commands, and is very simple to implement in applications.

Without an external sensor such as an encoder, the EM503 stepper drive can automatically identify 100% of stall of driven motors at 300 RPM or above, and send fault signals back to motion controller or other devices. The EM503 stepper drive also adopts advanced features like electrical damping, anti-resonance, start-up smoothing, multi-stepping.It is capable of driving a wide range of 2-phase stepper motors with high precision at extra smoothness, quietness, and very low motor heating. Its Multi-Stepping feature allows a low resolution step input to produce a much higher microstep output for smoother & quiet motor movement, and much lower motor heating. This will significantly improve the performance of your stepper control systems.

The EM503 stepper drive is easy to setup and configure via DIP switches. Also, a user can simply set the idle current to full (100%) or 50% of the output current via a DIP switch. Its motor auto identification and drive self-configuration feature allows quick and easy setup for various motors at optimal performance. Leadshine also offers matched stepper motors for the EM503 with their optimized configurations stored in the stepper drive. The user only needs to use the motor rotary switch to select the right motor, and the EM503 will automatically load the pre-setting optimized settings for best performance. For driving a non-Leadshine stepper motor, the user can use the 'Motor Auto Identification and Configuration' feature of the EM503 to get optimized performance.

For advanced users, Leadshine offers tuning software for performance fine-tuning. The user can tune a stepper motor's three resonance areas (usually around 1 rps, 2 rps, and 4 rps) to reduce noise and vibration, set microstep resolution to any value from 200 to 104,000 (increase by 200), and configure output current to any value of 0.5 to 4.20 A and idle current of 1-100% of output current.


  • Sensorless stall detection
  • Extra-low motor noise offers excellent quietness
  • User password protection prevents others from copying your drive configurations
  • Optimizes torque and nulls mid-range instability
  • Self-test and Auto-configuration technology
  • Options to set output current and microstep resolutions via DIP switch or software
  • Automatic idle-current reduction and reduction rate is software configurable
  • Fault out prevents damages to your machines or the materials
  • Step & direction or CW/CCW control
    • SKU
    • Weight
      0.24 kg
    • Dimensions (L x W x H)
      13 x 9 x 4 cm

Supply voltage: 20 to 50 VDC

Output current: 0.5 to 4.2 A

Pulse input frequency: 200 kHz

Logic signal current: 7 to 16 mA

Microstep: 1 to 512

Resolution settings: 15 (400 to 25600)

Output current settings: 7 (1.6 to 4.2)  

Isolation resistance: 500 MΩ 

Operating environment: 

  • Environment: Avoid dust, oil fog and corrosive gases
  • Ambient temperature: 0 to 50 °C
  • Humidity: 40 to 90 %RH
  • Operating temperature: 70°C
  • Vibration: 10 to 55 Hz, 0.15 mm/s 

Storage temperature: -20 to 65 °C

Weight: 209 g

Dimension: 116 x 69.2 x 26.5 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.

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