Table of Contents
2.5 Connecting BLOX to Stepper Motors
OpenBuilds BLOX provides support for 2x Bipolar Stepper Motors, with software-controlled current setting and fault monitoring.
- Motor Max Current: 3.2A
- Motor Voltage: 3V ideally, higher will limit acceleration
- Motor Inductance: 1-2mH ideally, higher will limit max speed
2.5.1 Wiring
Note: The color codes shown below only apply to OpenBuilds Motors. Refer to FAQ: Identify Motor coils to identify the coil pairs or if you have issues with motors not working correctly.
| BLOX Terminal | Device |
| A+ | Coil 1 (Red) |
| A- | Coil 1 (Blue) |
| B- | Coil 2 (Green) |
| B+ | Coil 2 (Yellow) |
 | IMPORTANT WARNING: Note: Never connect/disconnect motors to a powered-up controller. Always turn off power before connecting/disconnecting accessories to/from your BLOX |
| Wiring NEMA 17 Motors | Wiring NEMA 23 Motors |
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2.5.2 Stepper Driver FAULT modes
Faults that trigger FAULT MODE:
- Overcurrent (Adjust current down a little)
- Overtemperature (Adjust current down a little, improve cooling)
- Short circuit (Check wiring, Check motor)
- Low Input voltage (Check Power Supply)
If you encounter a Driver Fault:
- Turn off power
- Resolve the issue
- Give the drivers a few minutes to cool down
- Turn power back on
- Note: The FAULT will persist until both cleared, and power has been turned off and on, to protect the stepper drivers