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10. Sequence Chart of Control Signals
In order to avoid some fault operations and deviations, PUL, DIR and ENA signals must abide by
some rules, as shown in the following diagram (assuming J1 default setting is upward-rising edge
effective):
Figure 11: Sequence chart of control signals
Remark:
(1) t
: ENA must be ahead of DIR by at least 5μs. Usually, ENA+ and ENA- are NC (not
1
connected). See "Connector P1 Configurations" for more information.
(2) t
: DIR must be ahead of PUL active edge by at least 5μs to ensure correct direction;
2
(3) t
: Pulse width not less than 1.5μs;
3
(4) t
: low level width not less than 1.5μs.
4
11. Protection Functions
To improve reliability, the driver incorporates some built-in protections features.
Over-voltage protection
When power supply voltage exceeds +52VDC, protection will be activated and power indicator LED
will turn red. When power supply voltage is lower than +20VDC, the driver will not works properly.
Coil-ground Short Circuit Protection
Protection will be activated in case of short circuit between motor coil and ground.
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ME542 Economical Microstepping Driver Manual V1.0
11
Web Site:
www.leadshine.com
Attention
: Since there is no protection against power leads (﹢, ﹣) reversal, it is critical to make
sure that power supply leads correctly connected to the driver. Otherwise, the driver will be damaged
instantly.
12. Frequently Asked Questions
In the event that your ME542 doesn't operate properly, the first step is to identify whether the
problem is electrical or mechanical in nature. The next step is to isolate the system component that
is causing the problem. As part of this process you may have to disconnect the individual
components that make up your system and verify that they operate independently. It is important to
document each step in the troubleshooting process. You may need this documentation to refer back
to at a later date, and these details will greatly assist our Technical Support staff in determining the
problem should you need assistance.
Many of the problems that affect motion control systems can be traced to electrical noise,
controller software errors, or mistake in wiring.
Problem Symptoms and Possible Causes
Symptoms
Motor is not rotating
Motor rotates in the wrong direction
The driver in fault
Erratic motor motion
Motor stalls during acceleration
Excessive motor and driver heating
Tel: +086 0755-26434369
www.leadtronker.com
ME542 Economical Microstepping Driver Manual V1.0
Possible Problems
No power
Microstep resolution setting is wrong
DIP switch current setting is wrong
Fault condition exists
The driver is disabled
Motor phases may be connected in reverse
DIP switch current setting is wrong
Something wrong with motor coil
Control signal is too weak
Control signal is interfered
Wrong motor connection
Something wrong with motor coil
Current setting is too small, losing steps
Current setting is too small
Motor is undersized for the application
Acceleration is set too high
Power supply voltage too low
Inadequate heat sinking / cooling
Automatic current reduction function not being utilized
Current is set too high
12
Web Site:
www.leadshine.com
www.leadtronker.com
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