DS860H Digital two-phase step drive

一、Product profile

1. summary

DS860H is a new digital hybrid step drive with serial port debugging function launched by Core Internet of Things Technology Co., Ltd. It adopts the latest 32-bit DSP control technology and integrates MODBUS-RTU standard protocol specifications. Users can set multiple parameters in 200-40000 through the upper computer debugging software, which greatly enriches the practical function of the product and can meet the application needs in most occasions.

The DS860H drive adopts the control principle of servo, which integrates vector control technology, built-in differential technology and adaptive filtering technology, which greatly optimizes the performance of the stepping motor, low, medium and high speed and stable operation with low noise.Accurate and smooth pure string current vector control technology effectively reduces the motor heating.

The DS860H drive drive voltage ranges from A C 20 V to 80 V for a two-phase hybrid stepping motor with a peak current below 7.2A with an external diameter of 57 to 110 m m.

2. characteristic

● with serial port debugging function    

 ● has a brand new 32-bit DSP technology

●  small and easy to install

● can drive the 4-, 6-, and 8-line two-phase stepping motors  

● -light isolated differential signal input

● built-in microdetails

● subdivision set range of 200-40000

● pulse response frequency of up to 200KHz (higher adjustable)

● current can be set arbitrarily between the 0.1-7.2A s

● precision current control greatly reduces the motor heating

● has protective functions such as over-pressure, under-pressure and over-current

●The current is automatically halved when  stationary

3. application area

Suitable for a variety of small and medium-sized automation equipment and instruments, such as: engraving machine, marking machine, cutter, plotter, CNC machine tools, automatic assembly equipment, etc.In the user expects small noise, high speed device application effect is particularly good.

II. Electrical, mechanical and environmental indicators

1. Electrical indicators

2. Use the environment and the parameters

3. Mechanical installation diagram

Figure 1 Installation dimension diagram (unit: mm)

It is recommended to use side installation, better heat dissipation effect, when the design and installation size, pay attention to the terminal size and wiring!

4. Strengthen heat dissipation

1）The reliable operating temperature of the drive is usually within 50℃ and the motor is within 80℃;

2）It is recommended to choose the automatic half-flow mode, that is, when the motor stops, the current automatically reduces by half, to reduce the heat of the motor and the drive;

3）When installing the drive, use the side installation and form strong air convection on the drive bottom; if necessary, install the fan near the drive to form air convection, assist the drive heat dissipation, and ensure that the drive works within a reliable operating temperature range.

III. Introduction of drive interface and wiring

1. Interface description

1) Control the signal interface

2) Strong power interface

3) 232 Communication interface

The DS860H-driven serial port communication interface adopts the PH2.0-7P white terminal, which can be connected to the PC through the USB to TTL serial port conversion tool, and live plug is prohibited!At the PC end, the customer can set the required parameters, such as current, subdivision, working mode, etc., depending on the upper computer software interface.

▶ Note: The cables connected to DS860H and PC must be confirmed before use as special cables (randomly attached to the user situation) to avoid damage.

4) Status indication

The green LED is the power indicator and the LED is on when the drive is on and the LED goes off when the drive is off.

The red LED is the fault indicator, which flashes for 3 seconds when the fault is eliminated by the user, the red LED is often out.Red LED flashes in 3 seconds represent different fault information, as shown in the following table:

2. Control the signal interface circuit

Figure 2. Input interface circuit

The control signal end of the DS860H drive adopts differential interface circuit, which can be applied to differential signal, single-end co-Yin and co-Yang interfaces, and built-in high-speed photoelectric coupler, with strong anti-interference ability in bad environment.A schematic diagram of the interface circuit is shown in Figure 2.

▶ Note: The DS860H is a 5V-24V universal drive, so no serial resistance is required;

3. Control signal timing diagram

To avoid some misaction and deviations, P LS, DIR and ENA shall meet certain requirements as shown in the following figure:

FIG. 3 Control signal timing diagram

explanatory note:

1）The t1: ENA (enabling signal) shall be DIR at least 5ms in advance to be high.In general, ENA + and ENA-can be suspended.

2）The t2: DIR at least early PLS decreases along 5s determines its state high or low.

3）The t3: Pulse width is not less than 2.5s.

4）The t4: Low level width is not less than 2.5s.

4. Control the signal mode setting

Pulse trigger edge selection: The pulse up edge or drop edge trigger can be set through the PC software.

5. Connection requirements

1）In order to prevent the interference of the drive, it is recommended to adopt the control signal shield cable, and the shield layer is short connected to the ground wire. Besides special requirements, the single end of the shield wire of the control signal cable is grounded: one end of the upper machine of the shield wire is grounded, and one end of the shield wire is suspended.Only the same ground in the same machine, if not the real grounding wire, may interfere seriously, when the shielding layer is not connected.

2）Pulse and direction signal line and the motor line are not allowed to be bandaged side by side, it is best to be separated by at least 10cm, otherwise the motor noise can easily interfere with the pulse direction signal to cause inaccurate motor positioning, system instability and other faults.

3）If one power supply is for multiple drives, a parallel connection shall be taken at the power supply to one first to one chain is not allowed.

4）The strong electric terminal of the live unplug drive is strictly prohibited. When the charged motor stops, there will still be a large current flowing through the coil. The live unplug terminal will lead to a huge instantaneous inductive electric potential to burn out the drive.

5）It is not prohibited to tin the wire head to the terminal, otherwise the terminal may be damaged due to large contact resistance.

6）The wiring head shall not be exposed to the terminal to prevent accidental short circuit.

四、Dialup switch function setting

The DS860H drive uses an 8-bit dial switch with SW1-SW3 to set current; SW4 for full or half-flow lock; SW5-SW8 for subdivision settings.Details are described as follows:

1. Current setting

1）Working (dynamic) current setting

2）Still (static) current setting

Static current can be set with the SW4 dial switch, OFF indicates that the static current is set to half of the dynamic current, and ON indicates that the static current is the same as the dynamic current.SW4 should be set as OFF in general use to reduce the heating of motor and drive and improve reliability.After the pulse input stops, the current is automatically reduced to half (or the percent lock electromechanical flow can be set by itself through the host software).

2. Subdivision setting

五、Power supply selection

The power supply voltage can work normally between the specified range. The DS860H drive is best to use non-stable voltage DC power supply, or transformer voltage reduction + bridge rectification + capacitance filter.However, it should be noted that the rectified voltage ripple peak shall not exceed the specified maximum voltage.It is recommended that users use DC voltage below the maximum voltage to avoid grid fluctuations exceeding the operating range of the drive voltage.

If the voltage stable switch power supply is used, the output current range of the switch power supply should be set to the maximum.

▶ pay attention to:

1）Pay attention to the positive and negative power supply do not reverse connect;

2）It is best to use a non-stable type of DC power supply;

3）When using a non-stable voltage power supply, the power supply current output capacity should be greater than 60% of the set current of the drive;

4）When using a non-stable voltage switch power supply, the output current of the power supply shall be greater than or equal to the operating current of the drive;

5）To reduce costs, two or three drives can share one power supply, but should ensure sufficient power.

六、defencive function

1. short-circuit protection

In case of a alternate short circuit and an overflow inside the drive, the drive red light flashes once and flashes repeatedly in a cycle of 3 seconds.At this point, the fault must be eliminated and reset again.

2. overvoltage crowbar

When the input voltage is above AC80V / DC110V, the drive red light flashes twice and repeatedly in a 3 second cycle.The fault must be eliminated and reset again.

3. undervoltage protection

When the input voltage is below AC20V / DC30V, the drive red light flashes 3 times and repeatedly in a 3 second cycle.The fault must be eliminated and reset again.

4. Lack of phase protection

When the current is initial, when the motor is phase, the driver red light flashes 5 times and flashes repeatedly in a cycle of 3 seconds.At this point, the fault must be eliminated and reset again.

Video of Stepper Motor Driver