DM870 Digital Stepping Driver Manual V1.0
Tel: +086 0755-26434369 11 Web Site: www.leadshine.com
The current automatically reduced to 60% of the selected dynamic current one second after the last
pulse. Theoretically, this will reduce motor heating to 36% (due to P=I
2
*R) of the original value. If
the application needs a different standstill current, please contact Leadshine.
8. Wiring Notes
l
In order to improve anti-interference performance of the Drive, it is recommended to use
twisted pair shield cable.
l
To prevent noise incurred in PUL/DIR signal, pulse/direction signal wires and motor wires
should not be tied up together. It is better to separate them by at least 10 cm, otherwise the
disturbing signals generated by motor will easily disturb pulse direction signals, causing motor
position error, system instability and other failures.
l
If a power supply serves several Drives, separately connecting the Drives is recommended
instead of daisy-chaining.
l
It is prohibited to pull and plug connector P2 while the Drive is powered ON, because there is
high current flowing through motor coils (even when motor is at standstill). Pulling or plugging
connector P2 with power on will cause extremely high back-EMF voltage surge, which may
damage the Drive.
9. Typical Connection
A complete stepping system should include stepping motor, stepping Drive, power supply and
controller (pulse generator). A typical connection is shown as figure 9.
Figure 9: Typical connection
DM870 Digital Stepping Driver Manual V1.0
Tel: +086 0755-26434369 12 Web Site: www.leadshine.com
10. Sequence Chart of Control Signals
In order to avoid some fault operations and deviations, PUL, DIR and ENA should abide by some
rules, shown as following diagram:
Figure 10: Sequence chart of control signals
Remark:
a)
t1: ENA must be ahead of DIR by at least 5
µ
s. Usually, ENA+ and ENA- are NC (not
connected). See
“
Connector P1 Configurations
”
for more information.
b)
t2: DIR must be ahead of PUL active edge by 5
µ
s to ensure correct direction;
c)
t3: Pulse width not less than 2.5
µ
s;
d)
t4: Low level width not less than 2.5
µ
s.
11. Protection Functions
To improve reliability, the Drive incorporates some built-in protection functions. The DM870 uses
one RED LED to indicate what protection has been activated. The periodic time of RED is 3 s
(seconds), and how many times the RED turns on indicates what protection has been activated.
Because only one protection can be displayed by RED LED, so the Drive will decide what error to
display according to their priorities. See the following
Protection Indications
table for displaying
priorities.
Over-current Protection
Over-current protection will be activated when continuous current exceeds 16A or in case of short
circuit between motor coils or between motor coil and ground, and RED LED will turn on once
within each periodic time (3 s).