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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:
Figure 10: Sequence chart of control signals
Remark:
a)
t1: ENA must be ahead of DIR by at least 5ms. 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 5ms to ensure correct direction;
c)
t3: Pulse width not less than 7.5ms;
d)
t4: Low level width not less than 7.5ms.
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DM422 Digital Stepping Driver Manual V1.0
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11. Protection Functions
To improve reliability, the driver incorporates some built-in protection functions. The DM422 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 driver 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 41±1 VDC, protection will be activated and RED LED will
turn on twice within each periodic time (3 s).
Phase Error Protection
Motor power lines wrong & not connected will activate this protection. RED LED will turn on four
times within each periodic time (3 s).
Attention:
When above protections are active, the motor shaft will be free or the LED will turn red.
Reset the driver by repowering it to make it function properly after removing above problems. Since
there is no protection against power leads (﹢,﹣) reversal, it is critical to make sure that power
supply leads correctly connected to driver. Otherwise, the driver will be damaged instantly.
Protection Indications
Priority
Time(s) of ON
Sequence wave of RED LED
st
1
1
nd
2
2
rd
3
4
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DM422 Digital Stepping Driver Manual V1.0
Description
Over-current protection
Over-voltage protection
Phase error protection
12
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