EM542S, 4.2 A, Open-Loop Stepper Driver
The EM542S 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 4.2 A, operating at 20-50 VDC.
The EM542S 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 EM542S is able to power 2 phase (1.8°) and 4 phase (0.9°) stepper motors smoothly with very low motor heating & noise. All the micro step and output current configurations can be easily done via built in DIP switches. Its control type and command smooth filtering can also be configured via DIP switches. Therefore, the EM542S is an ideal choice for many applications requiring simple step & direction or CW/CCW control of NEMA 17, 23, and 24 stepper motors.
Features:
- Step & direction (PUL/DIR) or CW/CCW (double pulse) control
- 20-50VDC supply voltage
- 200 KHz max pulse input frequency
- 5V / 24V control signal voltage setting by DIP switch, default is 24V
- 16 micro step settings of 200-25,600 via DIP switches, or 200-51,200 via software (increase by 200)
- 8 output current settings of 1.0-4.2A via DIP switches, or 0.5-4.2A via software
- Configurable control command smoothing time to reduce motor vibration
- Automatic idle current reduction to 50% or 90%
- Convenient self-test for easy diagnosis
- Automatic self-configuration to match wide-range NEMA 17, 23, and 24 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
- Fault output and Barke output
- Over-voltage and over-current protections
- CE certified and RoHS compliant
The EM542S is suitable for a wide range of stepping motors of size Nema 16, 17 and 23, and suits various kinds of machines, including X-Y tables, labeling machines, laser cutters, engraving machines and pick-place devices.
Programming Cable:
The drive can be tuned with the Protuner software and an Cable-PC-1 DE9 serial cable.
Supply voltage: 20 to 50 VDC
Output current: 1.0 to 4.2 (3.0 RMS) A
Logic signal current: 7 to 16 mA
Micro-step resolution: 16 (200 to 25,600) via DIP switches
Pulse input frequency: 0 to 200kHz
Minimal pulse width: 2.5 µS
Minimal direction setup: 5.0 µS
Isolation resistance: 500 MΩ
Operating environment:
- Environment: Avoid dust, oil fog and corrosive gases
- Ambient temperature: 0 to 65°C
- Humidity: 40 to 90%RH
- Operating temperature: 0 to 50°C
- Vibration: 10 to 50Hz / 0.15mm
Storage temperature: -20 to 65°C
Weight: Approx. 250 g
Dimension: 118 × 75.5 × 26 mm
Dispatch
In-stock orders are dispatched within 2 business days.
Shipping options
We deliver across Australia and internationally by any of the following methods:
- Australia Post Express
- Australia Post Parcel Post
- DHL
- FedEx (only international)
- Freight account. We'll email packaging dimensions when the shipment is ready to be book.
*Transit times vary depending on the shipping method and destination.
Store Pickup - Carrum Downs, Victoria, 3201
Order before 11am to collect after 2pm the same day. Mon–Fri, 9am–5pm, excludes public holidays.
RETURNS
How to return an item Contact us before sending anything back. Email info@oceancontrols.com.au or call +61 3 9708 2390. We'll confirm eligibility and guide you to the return process.
Return window 14 days from dispatch date.
Condition required Items must be unused and in original packaging, including all documentation and manuals.
Restocking fee A 20% restocking fee applies to all accepted returns. Return shipping costs are the customer's responsibility.
Non-returnable items
- Custom-made or specially imported products
- Software licences (some software have trial versions available)
- Items not in original, as-new condition
WARRANTY
How to make a warranty claim Before returning anything, please contact us. Our engineers can often resolve the issue remotely. If a return is required, our team will provide you with a warranty form to include with the goods.
What's covered Defects in materials and workmanship under normal use and correct installation.
What's not covered The warranty does not cover damage or failures caused by factors outside our control, including incorrect installation, unauthorised alterations or modifications, or any installation or use not recommended by the manufacturer.
Standard warranty All products carry a 12-month warranty from the date of purchase unless stated otherwise.
Extended warranty
- Labjack: 5 Years
- Atop: 5 Years
- MeanWell: 3 Years
- Teracom: 3 Years
- Novus: 3 Years
















