The DMA860H is a fully digital stepper drive designed for controlling stepping motors. It leverages an advanced DSP control algorithm and the latest motion control technology to provide smooth motor movement, optimal torque, and reduced mid-range instability. This drive is particularly suited for applications requiring low noise, low heating, high speed, and high precision.
Function Description
The DMA860H operates by receiving pulse and direction signals to control the movement of a connected stepper motor. It supports both PUL/DIR (pulse/direction) and CW/CCW (clockwise/counter-clockwise) control modes, selectable via internal jumpers. The drive features motor auto-identification and parameter auto-configuration technology, which allows it to automatically optimize its responses for different motors, simplifying setup and ensuring efficient operation.
A key feature is its Anti-Resonance capability, which provides optimal torque and effectively nullifies mid-range instability, a common issue in stepper motor systems. Multi-Stepping functionality enables the drive to produce a higher microstep output from a low-resolution step input, resulting in smoother motor movement.
The drive incorporates several protection functions to enhance reliability and prevent damage. These include over-voltage protection, over-current protection, and short-circuit protection. When any of these protections are activated, the motor shaft will become free, and the power indicator LED will turn red. The drive can be reset by repowering it after the issue has been resolved.
Important Technical Specifications
- Input Voltage: The DMA860H can accept a wide range of input voltages, specifically 36-112 VDC or 24-80 VAC. It is recommended to use power supplies with a theoretical output voltage of +20 to +68 VDC or 24 to 68 VAC to allow for voltage fluctuations and back-EMF.
- Output Current: The drive offers 8 selectable peak current settings, ranging from 2.40A to 7.20A. The output current can be configured via DIP switches. The REF Current settings are 2.00A, 2.57A, 3.14A, 3.71A, 4.28A, 4.86A, 5.43A, and 6.00A, corresponding to peak currents of 2.40A, 3.08A, 3.77A, 4.45A, 5.14A, 5.83A, 6.52A, and 7.20A respectively.
- Microstep Resolutions: The DMA860H provides 16 selectable microstep resolutions, allowing for fine control over motor movement. These resolutions include 400, 800, 1600, 3200, 6400, 12800, 25600, 51200, 1000, 2000, 4000, 5000, 8000, 10000, 20000, and 40000 steps/revolution for a 1.8° motor.
- Pulse Input Frequency: The drive supports a pulse input frequency of up to 200 KHz, making it suitable for high-speed applications.
- Pulse Width: The minimum required pulse width is 2.5 µs.
- Logic Signal Current: The typical logic signal current is 10 mA, with a minimum of 7 mA and a maximum of 16 mA.
- Pulse Voltage: The pulse voltage is 5 VDC.
- Isolation Resistance: The isolation resistance is 500 MΩ.
- Operating Temperature: The recommended operating temperature for the driver is <70°C (158°F), and for the motor, it is <80°C (176°F). The ambient operating temperature range is 0°C to 50°C.
- Humidity: The operating humidity range is 40%RH to 90%RH.
- Vibration: The maximum vibration tolerance is 5.9 m/s².
- Dimensions: The mechanical dimensions are approximately 151 mm (5.945 in) in length, 97 mm (3.819 in) in width, and 48 mm (1.89 in) in height.
- Weight: The drive weighs approximately 570g (20.10 oz).
Usage Features
- Motor Compatibility: The DMA860H is suitable for a wide range of 2-phase and 4-phase hybrid stepping motors, from NEMA size 17 to 42.
- Soft-Start: It features a soft-start function, eliminating any "jump" when powered on, which contributes to smoother operation and reduced mechanical stress.
- Automatic Idle-Current Reduction: The drive includes an automatic idle-current reduction feature. By default, the standstill current is set to half of the selected dynamic current one second after the last pulse. This significantly reduces motor and driver heating (theoretically to 36% of the original value), improving efficiency and longevity. This feature can be toggled via DIP switch SW4.
- Control Signal Interface: The drive has 3 optically isolated logic inputs (PUL, DIR, ENA) on connector P1, compatible with TTL signals. It can accept differential and single-ended inputs (including open-collector and PNP output). Line driver control signals are recommended for improved noise immunity in noisy environments.
- Motor Connection Flexibility: The drive supports various motor wiring configurations for 4-lead, 6-lead, and 8-lead motors.
- 4-lead motors: Simple to wire; output current should be 1.4 times the specified phase current.
- 6-lead motors: Can be configured for "half coil" (higher speed, lower torque) or "full coil" (higher torque, lower speed). For half coil, output current is 1.4 times the specified per phase (unipolar) current. For full coil, motors should run at 70% of their rated current to prevent overheating.
- 8-lead motors: Offer high flexibility with series or parallel connections. Series connections provide higher torque at lower speeds but degrade performance at higher speeds; motors should run at 70% of their rated current. Parallel connections offer more stable, lower torque at lower speeds but higher torque at higher speeds; output current should be 1.96 times the per phase (unipolar) current or 1.4 times the bipolar current.
- Power Supply Selection: Both regulated and unregulated power supplies can be used. Unregulated power supplies are preferred due to their ability to withstand current surges. For multiple drivers, it is recommended to connect each driver separately to the power supply rather than daisy-chaining to avoid cross-interference.
- Auto Tuning: The drive features an auto-tuning function, activated by toggling DIP switch SW4 twice within one second after power-up. This identifies motor parameters and automatically calculates optimal current loop parameters, ensuring optimized performance. A slight motor shaft vibration will occur during this process. This should be performed upon initial installation or if the motor or power supply is changed.
Maintenance Features
- Heat Dissipation: To ensure reliable operation, the driver's working temperature should remain below 70°C (158°F). Vertical mounting is recommended to maximize the heat sink area. Forced cooling methods should be employed if necessary. The automatic idle-current reduction feature helps reduce heating when the motor is stopped.
- Wiring Notes:
- Twisted pair shielded cables are recommended for control signals to improve anti-interference performance.
- Pulse/direction signal wires and motor wires should be kept separate by at least 10 cm to prevent noise interference, which could lead to motor position errors or system instability.
- It is crucial NOT to pull or plug connector P2 (motor and power connections) while the driver is powered ON, as this can cause extremely high back-EMF voltage surges and potentially damage the driver.
- Troubleshooting: The manual provides a comprehensive section on frequently asked questions and problem symptoms with possible causes, aiding in self-diagnosis and resolution of common issues such as the motor not rotating, rotating in the wrong direction, erratic motion, stalling during acceleration, or excessive heating. This documentation is valuable for technical support.
- Warranty: The product comes with a Twelve Month Limited Warranty, with specific exclusions and limitations detailed in the appendix. Information on obtaining warranty service and contact details are also provided.
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