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9. Typical Connection

A complete stepping system should include stepping motor, stepping driver, power supply and

controller (pulse generator). A typical connection is shown as figure 9.

DM556 Driver

DIR+

Controller

VCC

PUL-

+20

+50 VDC

Stepping Motor

VDC

GND

A+

A-

B+

270Ω

270Ω

270Ω

PUL+

ENA-

R=0 if VCC=5V;

R=1K(Power>0.125W) if VCC=12V;

R=2K(Power>0.125W) if VCC=24V;

R must be connected to control signal terminal.

R

R

R

PUL

DIR

ENABLE

B-

DIR-

ENA+

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 5

μs. Usually, ENA+ and ENA- are NC (not

connected). See “Connector P1 Configurations” for more information.

2LD545 Driver

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b)

t2: DIR must be ahead of PUL active edge by 5

μs to ensure correct direction;

c)

t3: Pulse width not less than 2.5

μs;

d)

t4: Low level width not less than 2.5

μs.

11. Protection Functions

To improve reliability, the driver incorporates some built-in protection functions. The 2LD545

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 52±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).

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

Description

1

st

1

Over-current protection