PST5056 User Manual
REV1.0 11
It is prohibited to pull and plug connector P2 while the driver 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 driver.
9. Typical Connections
A complete stepping system should include stepping motor, stepping driver, 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:
Figure 10: Sequence chart of control signals
PST5056 User Manual
REV1.0 12
Remark:
(1) t1: ENA must be ahead of DIR by at least 5
s. Usually, ENA+ and ENA- are NC
(not connected). See “Connector P1 Configurations” for more information.
(2) t2: DIR must be ahead of PUL active edge by 5
s to ensure correct direction;
(3) t3: Pulse width not less than 2.5
s;
(4) t4: Low level width not less than 2.5
s.
11. Protection Functions
To improve reliability, the driver incorporates some built-in protection functions. The PST5056
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.
11.1 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).
11.2 Over-voltage Protection
When power supply voltage exceeds 52
±
1 VDC, protection will be activated and RED LED
will turn on twice within each periodic time (3 s).
11.3 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.
