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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.
If a power supply serves several Drives, separately connecting the Drives is recommended
instead of daisy-chaining.
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
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:
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DM422C Digital Stepping Driver Manual V1.0
11
Remark:
a)
t1: ENA must be ahead of DIR by at least 5µs. Usually, ENA+ and ENA- are NC (not
connected). See "Connector P1 Configurations" for more information.
b)
t2: DIR must be ahead of PUL effective edge by 5µs to ensure correct direction;
c)
t3: Pulse width not less than 7.5µs;
d)
t4: Low level width not less than 7.5µs.
11. Protection Functions
To improve reliability, the Drive incorporates some built-in protection functions. The DM422C 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).
Over-voltage Protection
When power supply voltage exceeds 42±1 VDC, protection will be activated and RED LED will
turn on twice within each periodic time (3 s).
Tel: +000 0000-00000000
info@dold-mechatronik.de
www.dold-mechatronik.de
DM422C Digital Stepping Driver Manual V1.0
Figure 10: Sequence chart of control signals
12
Sarach 10 – D-77790 Steinach
Telefon: +49 7832 / 9744670
DOLD Mechatronik
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