2.

Application
User ’s Manual for DM860A It can be used in various kinds of machines, such as laser cutters,
laser markers, high precision X-Y tables, labeling machines,and so
on. Its unique features make the DM860A an ideal solution for
applications that require both low-speed smoothness and high speed
performances.
3.Features
●16 channels constant angle, constant torque micro steps, highest
micro step: 51200 steps/rev；
●Highest response frequency: 200KHz ；
●Support PUL/DIR and CW/CCW modes；
●Current of winding will be reduced by approximately 50% when no
step pulse command is received for 1.5 seconds ；
●Opto-isolated Signal I/O ；
● Drive current is adjustable in 8 channels from 2.0A/phase to
6.0A/phase ；
●Single power supply from Single power supply from 18V to 80VAC or
24V to 110VDC ；
1.Description ●Better to overcome the problem of low frequency vibration；
The DM860A is fully digital 2-phase stepping driver based on ARM ●Over-voltage, over-current, phase-error protections
control , the drive voltage ranges from 18V～ 80VAC or 24V～110VDC. ●Dimension:150×52.7×97.5 mm³; Net Weight: 500g.
It is designed for use with the 2-phase hybrid stepper motor of all 4.Specifications
kinds with 57mm to 86mm outside diameter, regulated phase current Electrical Specifications (Tj = 25℃/77℉)
from 2.8A to 8.4A. The circuit that it adopts is similar to the Parameters Min Typical Max Unit
circuit of servo control which enables the motor run smoothly without Output current 2.4 - 8.4 A
noise and vibration. Supply voltage(VDC) +24 48 +110 Vdc
 Supply voltage(AC) 18 60 80 AC equipment.
Logic signal current 7 10 20 mA 6.Current Setting
Pulse input frequency 0 - 200 kHz The first three bits (SW1, SW2, SW3) of the DIP switch are used
Isolation resistance 500 MΩ to set the dynamic current. Select a setting closest to your motor’
s required current.The current shows in the following table:
5.Dimension Diagram(unit mm)
Peak Current RMS Current SW1 SW2 SW3
2.8 2.0 ON ON ON
3.5 2.5 OFF ON ON
4.5 3.2 ON OFF ON
5.3 3.8 OFF OFF ON
5.9 4.2 ON ON OFF
6.7 4.8 OFF ON OFF
7.4 5.3 ON OFF OFF
8.4 6.0 OFF OFF OFF
SW4:OFF=Half Current,ON=Full Current
7.MicroStep Setting & Speed(Speed Mode) Setting
The MicroStep and Speed is set by SW5,SW6,SW7,SW8 of the DIP switch
as shown in the following table:
Pulse/rev SW5 SW6 SW7 SW8 Speed(r/min)
400 ON ON ON ON 5
800 OFF ON ON ON 10
Figure 1:Mechanical specifications 1600 ON OFF ON ON 15
When the Driver temperature exceeds 40°C,the fan will start to work. 3200 OFF OFF ON ON 30
When the Driver temperature exceeds 70°C, the current will be cut 6400 ON ON OFF ON 60
off automatically and the Driver will not work till the temperature 12800 OFF ON OFF ON 90
drops to 40°C. In case this happens, please install ventilation 25600 ON OFF OFF ON 120
 51200 OFF OFF OFF ON 150 Pulse signal: In single pulse (pulse/direction)
1000 ON ON ON OFF 180 PUL+ mode, this input represents pulse signal, each rising
2000 OFF ON ON OFF 210 or falling edge active (software configurable);
4000 ON OFF ON OFF 240 5-24V when PUL-HIGH, 0-0.5V when PUL-LOW. In double
5000 OFF OFF ON OFF 300 pulse mode (pulse/pulse) ,this input represents
PUL-
8000 ON ON OFF OFF 400 clockwise (CW) pulse. For reliable response, pulse
10000 OFF ON OFF OFF 500 width should be longer than 2.5μs.
20000 ON OFF OFF OFF 650 DIR signal: In single-pulse mode, this signal has
40000 OFF OFF OFF OFF 800 low/high voltage levels,representing two directions
Run Mode Setting Table DIR+ of motor rotation; in double-pulse mode , this signal
Run Mode SW9 SW10 is counter-clock (CCW) pulse. For reliable motion
Single Pulse mode:PUL+DIR OFF OFF response, DIR signal should be ahead of PUL signal
by 5μs at least. 5-24V when DIR-HIGH,0-0.5V when
Double pulse mode:CW/CCW ON OFF
DIR-LOW. Please note that rotation direction is also
I/O mode（Speed Mode） OFF ON
DIR- related to motor-Drive wiring match. Exchanging the
Self Test（±30 r/min） ON ON
connection of two wires for a coil to the Drive will
Speed Mode Setting Table
reverse motion direction.
PUL DIR Instruction
Enable signal: This signal is used for
1 1 Stop Rotation
ENA+ enabling/disabling the Drive. High level (NPN
1 0 Clock Wise Rotation (CW)
control signal, PNP and Differential control signals
0 1 Counter Clock Wise Rotation (CCW)
are on the contrary,namely Low level for enabling.)
0 0 Stop Rotation
ENA- for enabling the Drive and low level for disabling
the Drive. Usually left UNCONNECTED (ENABLED).
8.Terminal Function AC Power supply：AC18～80V
Pin function Details
AC DC24～110V
 A+ ，A-

B+， B- Motor Coil:

9.Control Signal Circuit

Figure 4: Sequence chart of control signals

Attention:
a) t1: ENA must be ahead of DIR by at least 5ms. Usually, ENA+ and
ENA- are NC (not connected).
Figure 2:Control signal Interface Connection Diagram b) t2: DIR must be ahead of PUL active edge by 100μs to ensure correct
direction;
c) t3: Pulse width not less than 2.5μs;
d) t4: Low level width not less than 2.5μs.

10.Connections to 4-lead Motors

4 lead motors are the least flexible but easiest to wire. Speed and
torque will depend on winding inductance. In setting the Drive output
current, multiply the specified phase current by 1.4 to determine
the peak output current.

Figure 3:Speed mode connection

11.ALM CODE(Protection Functions) 12.Problem Symptoms and Possible Causes
To improve reliability, the Driver incorporates some built-in Symptoms Possible Problems
protection functions. The DM860A uses one RED LED to indicate what No power
protection has been activated. The periodic time of RED is 2 seconds, Microstep resolution setting is wrong
and how many times the RED turns on indicates what protection has Motor is not rotating DIP switch current setting is wrong
been activated.Because only one protection can be displayed by RED Fault condition exists
LED, so the Drive will decide what error to display according to their The Drive is disabled
priorities. See the following Protection Indications table for Motor rotates in the
displaying priorities. Motor phases may be connected in reverse
wrong direction
RED LED DIP switch current setting is wrong
Alarm indicator The Driver in fault
Twinkle Times Something wrong with motor coil
Over current protection(short circuit between Control signal is too weak
1
motor coils or between motor coil and ground) Control signal is interfered
4 Driver temperature is over 70℃. Erratic motor motion Wrong motor connection
5 Over Voltage protection(80VAC or 110VDC) Something wrong with motor coil
No motor connected or poor connection Current setting is too small, losing steps
8
(phase error protection) Current setting is too small
Motor stalls during Motor is undersized for the application
acceleration Acceleration is set too high
Power supply voltage too low
Inadequate heat sinking / cooling
Excessive motor and Automatic current reduction function not
Drive heating being utilized
Current is set too high