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DM542 Fully Digital Stepper Drive Manual
When SW5, SW6, SW7, and SW8 are all on, the driver subdivision adopts the default internal
subdivision number of the driver: the user sets the subdivision number through the PC software
ProTuner or STU debugger, the minimum value is 1, the resolution is 1, The maximum value is
51200.
3. Parameter auto-tuning function
When the driver is open-loop stepping drive, each parameter of the motor can be automatically
recognized once at each power-on, and the driver can automatically complete the self-tuning of the
motor parameters and internal adjustment parameters; when the conditions of the motor and power
supply voltage change Please restart the auto-tuning once again, otherwise the motor may not
operate optimally. Note that the pulse cannot be input at this time, the direction signal should not
change, and the enable signal cannot be accessed.
五、Power supply selection
The power supply voltage can work normally between the specified ranges. The DM542 driver is
preferably powered by an unregulated DC power supply, or a transformer buck + bridge rectifier +
capacitor filter. Note, however, that the peak voltage ripple after rectification should not exceed its
specified maximum voltage. It is recommended that the user supply power with a DC voltage lower
than the maximum voltage to prevent the grid from fluctuating beyond the operating range of the
driver voltage.
If using a regulated switching power supply, be aware that the output current range of the switching
power supply must be set to maximum.
Please note:
1) When wiring, pay attention to the positive and negative poles of the power supply.
2) It is best to use an unregulated power supply;
3) When using an unregulated power supply, the power supply current output capability should be
greater than 60% of the drive set current;
4) When using a regulated switching power supply, the output current of the power supply should
be greater than or equal to the operating current of the driver;
5) In order to reduce the cost, two or three drives can share one power supply, but the power supply
should be large enough.
六、Motor matching
The DM542 can be used to drive 4, 6 and 8 wire two-phase, four-phase hybrid stepping motors
with a step angle of 1.8 degrees and 0.9 degrees. When selecting a motor, it is mainly determined
by the torque and rated current of the motor. The torque is mainly determined by the size of the
motor. The large-sized motor has a large torque; the current is mainly related to the inductance, and
the small-inductance motor has a high-speed performance, but the current is large.
1. Motor
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DM542 Fully Digital Stepper Drive Manual
1）load torque, drive ratio operating speed range
）
T
=C（Jε+T
motor
load
J: moment of inertia of the load ε: maximum angular acceleration of the load C: safety factor,
recommended value 1.2-1.4
T load: maximum load torque, including effective load, friction, transmission efficiency and
other resistance torque
2）What factors are determined by the motor output torque?
For a given stepper motor and coil connection, the output torque has the following
characteristics:
● The larger the actual motor current, the greater the output torque, but the more copper loss
(P=I2R) of the motor, the more heat the motor generates;
● The higher the power supply voltage of the driver, the higher the high-speed torque of the
motor;
● It can be seen from the moment frequency characteristic diagram of the stepping motor
that the high speed is smaller than the medium and low speed torque.
T(torque)
I+∆I
I
I-∆I
V(speed)
Figure 5 moment frequency characteristic diagram
2. Connecting the Motor
For 6- and 8-wire stepper motors, the performance of the connected motors of different coils is
quite different, as shown in the following figure:
T(torque)
V+∆V
V
V-∆V
V(speed)
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