StepperOnline DM556T User manual

DM556T Digital Stepper Drive User Manual
User Manual
DM556T
2-Phase Digital Stepper Drive
Record of Revisions
Manual Revision
Date
Description of Release
V1.0
Oct. 2022
Initial Release

DM556T Digital Stepper Drive User Manual
Table of Contents
1. Features ........................................................................................................................................................................... 1
2. Specifications .................................................................................................................................................................. 1
2.1 Electrical Specifications .........................................................................................................................................1
2.2 Environment ...........................................................................................................................................................1
2.3 Mechanical Specifications ..................................................................................................................................... 1
2.4 Elimination of Heat ................................................................................................................................................2
3. Connection Pin Assignments and LED Indication ..................................................................................................... 2
3.1 Control Connector ..................................................................................................................................................2
3.2 Fault Output Connector ..........................................................................................................................................3
3.3 Motor and Power Supply Connector ..................................................................................................................... 3
3.4 LED Light Indication ............................................................................................................................................. 3
4. Control Signal and Output Signal ................................................................................................................................3
4.1 Control Signal Connection .....................................................................................................................................3
4.2 Fault Output Connection ........................................................................................................................................3
5. Motor Connection .......................................................................................................................................................... 4
6. Power Supply Selection ................................................................................................................................................. 4
6.1 Power Supply Sharing ............................................................................................................................................4
6.2 Selecting Supply Voltage ....................................................................................................................................... 5
7. DIP Switch Configurations ............................................................................................................................................5
7.1 Microstep Resolution Configurations ....................................................................................................................5
7.2 Output Current Configurations .............................................................................................................................. 5
7.2.1 Dynamic Current Configurations ............................................................................................................... 6
7.2.2 Idle Current Configuration ..........................................................................................................................6
8. Wiring Notes ................................................................................................................................................................... 6
9. Typical Connection .........................................................................................................................................................6
10. Sequence Chart of Control Signals ............................................................................................................................ 7
11. Protection Functions .................................................................................................................................................... 7
12. Troubleshooting ............................................................................................................................................................8

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1. Features
Step & direction (PUL/DIR) control
Input voltage 20~50VDC
200 KHz max pulse input frequency
16 microstep resolutions of 200-51,200 via DIP switches
8 output current settings of 1.8-5.6A via DIP Switches
Idle current reduction to 50% or 90% selection via SW4
Anti-Resonance for optimal torque, extra smooth motion, low motor heating and noise
Soft-start with no “jump” when powered on
Optically isolated inputs with 5V or 24V
Fault output
Over-voltage and over-current protections
2. Specifications
2.1 Electrical Specifications
Parameters
DM556T
Min
Typical
Max
Unit
Output Current
1.8 (1.3 RMS)
-
5.6 (4.0 RMS)
A
Supply Voltage
20
24/36
50
VDC
Logic signal current
7
10
16
mA
Pulse input frequency
0
-
200
kHz
Isolation resistance
100
MΩ
2.2 Environment
Cooling
Natural Cooling or Forced cooling
Operating Environment
Environment
Avoid dust, oil fog and corrosive gases
Humidity
40%RH－90%RH
Operating Temperature
0°C －40°C (32°F - 109°F)
Vibration
10-50Hz / 0.15mm
Storage Temperature
-20°C －65°C (-4°F - 149°F)
Weight
About 230g
2.3 Mechanical Specifications
(unit: mm [1inch=25.4mm])

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Figure 1 Mechanical specifications
Side mounting recommended for better heat dissipation
2.4 Elimination of Heat
DM556T reliable working temperature should be < 40℃(109°F)
It is recommended to use automatic idle-current mode to reduce motor heating. That means set the SW4
pin of DIP switch at “OFF” position.
It is recommended to mount the drive vertically to maximize heat sink area. Use forced cooling method
to cool if necessary.
3. Connection Pin Assignments and LED Indication
3.1 Control Connector
PIN
Details
PUL+
Pulse and Direction Connection:
(1) Optically isolated, high level 4.5-5V or 24V, low voltage 0-0.5V
(2) Maximum 200 KHz input frequency
(3) The width of PUL signal is at least 2.5μs, duty cycle is recommended 50%
(4) DIR signal requires advance PUL signal minimum 5 μs in single pulse mode
(5) The factory setting of control signal voltage is 24V, must set dip switch if it is 5V
PUL-
DIR+
DIR-
ENA+
Enable Connection: (default no connection)
(1) Optically isolated, differential.
(2) Disable the drive by 4.5- 24V input connection; enable the drive by 0-0.5V connection
(3) ENA signal requires advance DIR signal minimum 5μs in single pulse mode
(4) Enable time to be at least 200ms
ENA-

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3.2 Fault Output Connector
Pin
Details
ALM+
(1) Maximum 30V/100mA output
(2) Sinking or sourcing
(3) The resistance between ALM+ and ALM- is low impedance as default, and will
change to high when the drive goes into error protection.
(4) Fault connection refer to chapter 4.2
ALM-
3.3 Motor and Power Supply Connector
Pin Function
Details
GND
Power supply ground connection.
+Vdc
Power supply positive connection. Suggest 24-48VDC power supply voltage
A+, A-
Motor Phase A connections. Connect motor A+ wire to A+ Pin; motor A- wire to A-
B+, B-
Motor Phase B connections. Connect motor B+ wire to B+ Pin; motor B- wire to B-
3.4 LED Light Indication
There are two LED lights for DM556T. The GREEN one is the power indicator which will be always on
generally. The RED one is a protection indicator which will flash 1-2 times in a 3-second period, when
protection enabled for a DM556T. Different number of flashes indicates different protection type (read section
11 for detail).
4. Control Signal and Output Signal
4.1 Control Signal Connection
The DM556T can accept can accept differential or single-ended control signals (pulse, direction, and enable)
in open-collector or PNP connection. It is recommended adding an EMI line filter between the power supply
and the drive to increase noise immunity for the drive in interference environments.
Figure 4: Connections to open-collector signal Figure 5: Connections to PNP signal
(common-anode) (common-cathode)
Notes:
(1) ENA signal is no-connected as default;
(2) Control signal amplitude is 24 V as default. If it is 12 V, please set dip switch to 5 V first, then connect 1KΩ
resistor; if it is 5V, please set to 5V.
4.2 Fault Output Connection
When over voltage or over current protection happens, DM556T red status LED light will blink and the
impedance state between ALM+ and ALM- will change (from low to high or high to low depending on
Drive
Controller
VCC
PUL-
PUL+
ENA-
PUL
DIR
ENABLE
DIR-
DIR+
ENA+
Drive
Controller
VCC PUL-
PUL+
ENA-
PUL
DIR
ENABLE
DIR-
DIR+
ENA+

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configuration) and can thus be detected. Fault output connection is optional, and it can be connected either in
sinking or sourcing.
Figure 6 Fault Connection
5. Motor Connection
The DM556T can drive 2-phase and 4-pahse bipolar hybrid stepper motors.
The 4 lead motors are the least flexible and easy to connect. The output current from drive that is multiply the
specified phase current by 1.4 to determine the peak output current.
Figure 7 4-lead Motor Connections
6. Power Supply Selection
The DM556T can power medium and large size stepping motors (frame size from NEMA 23 to 24). To get
good driving performances, it is important to select supply voltage and output current properly. Generally
speaking, supply voltage determines the high speed performance of the motor, while output current
determines the output torque of the driven motor (particularly at lower speed). Higher supply voltage will
allow higher motor speed to be achieved, at the price of more noise and heating. If the motion speed
requirement is low, it’s better to use lower supply voltage to decrease noise, heating and improve reliability.
6.1 Power Supply Sharing
Multiple DM556T drives can share one power supply to reduce cost, if that power supply has enough power
capacity. To avoid cross interference, connect each stepper drive directly to the shared power supply
separately. To avoid cross interference, DO NOT daisy-chain connect the power supply input pins of the
Drivers. Instead connect them to power supply separately.

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6.2 Selecting Supply Voltage
The DM556T is designed to operate within 20 - 50VDC voltage input. When selecting a power supply,
besides voltage from the power supply power line voltage fluctuation and back EMF voltage generated
during motor deceleration needs also to be taken into account. Please make sure leaving enough room for
power line voltage fluctuation and back-EMF voltage charge back.
Higher supply voltage can increase motor torque at higher speeds, thus helpful for avoiding losing steps.
However, higher voltage may cause bigger motor vibration at lower speed, and it may also cause
over-voltage protection or even drive damage. Therefore, it is suggested to choose only sufficiently high
supply voltage for intended applications.
7. DIP Switch Configurations
The DM556T has an 8-bit DIP switch and a 1-bit DIP switch. The first 8-bit is used to configure settings of
micro step resolution, output current, motor standstill current as shown below.
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
The 5V/24V dip switch is located on the top, used to configure the voltage of control signals. For the safety of
optically coupled, the factory setting is 24V.
7.1 Microstep Resolution Configurations
Microstep resolution is set by SW5, 6, 7, 8 of the DIP switches as shown in the following table. Note: “default”
means the parameters can be set by GUI tuning software.
Microstep
Steps/rev.(for 1.8°motor)
SW5
SW6
SW7
SW8
1
200 (default)
ON
ON
ON
ON
2
400
OFF
ON
ON
ON
4
800
ON
OFF
ON
ON
8
1600
OFF
OFF
ON
ON
16
3200
ON
ON
OFF
ON
32
6400
OFF
ON
OFF
ON
64
12800
ON
OFF
OFF
ON
128
25600
OFF
OFF
OFF
ON
5
1000
ON
ON
ON
OFF
10
2000
OFF
ON
ON
OFF
20
4000
ON
OFF
ON
OFF
25
5000
OFF
OFF
ON
OFF
40
8000
ON
ON
OFF
OFF
50
10000
OFF
ON
OFF
OFF
100
20000
ON
OFF
OFF
OFF
125
25000
OFF
OFF
OFF
OFF
7.2 Output Current Configurations
For a given motor, higher drive current will make the motor to output more torque, but at the same time
Idle Current
Output Current
Microstep

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causes more heating in the motor and drive. Therefore, output current is generally set to be such that the
motor will not overheat for long time operation. Since parallel and serial connections of motor coils will
significantly change resulting inductance and resistance, it is therefore important to set drive output current
depending on motor phase current, motor leads and connection methods. Phase current rating supplied by
motor manufacturer is important in selecting drive current; however the selection also depends on leads and
connections.
The first three bits (SW1, 2, 3) of the DIP switch are used to set the dynamic current. Select a setting closest
to your motor’s required current. Note: “default” means the parameters can be set by GUI tuning software.
7.2.1 Dynamic Current Configurations
Peak Current
RMS Current
SW1
SW2
SW3
1.8A
1.3A (default)
OFF
OFF
OFF
2.1A
1.5A
ON
OFF
OFF
2.7A
1.9A
OFF
ON
OFF
3.2A
2.3A
ON
ON
OFF
3.8A
2.7A
OFF
OFF
ON
4.3A
3.1A
ON
OFF
ON
4.9A
3.5A
OFF
ON
ON
5.6A
4.0A
ON
ON
ON
7.2.2 Idle Current Configuration
SW4 is used to set motor idle current percentage. At OFF position it means the standstill current is set to be
50% of the selected output current. At ON position it means standstill current is set to be 90%.
The current automatically reduced to 50% of the selected dynamic current 0.4 second after the last pulse.
8. Wiring Notes
In order to improve anti-interference performance of the drive, it is recommended to use twisted pair
shield cable.
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 only one power supply serves multiple DM556T drives, separately connecting the drives to the power
supply 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 below.

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Figure 8 Typical Connections
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 9 Sequence charts of control signals
Remark:
a) t1: ENA must be ahead of DIR by at least 200ms. 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 5 s to ensure correct direction;
c) t3: Pulse width not less than 2.5 s;
d) t4: Low level width not less than 2.5 s;
e) Duty cycle of Pulse signal is recommending 50%.
11. Protection Functions
To improve reliability, the drive incorporates some built-in protections features.

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Priority
Time(s) of
Blink
Sequence wave of red LED
Description
1st
1
Over-current protection activated when peak
current exceeds the limit.
2nd
2
Over-voltage protection activated when drive
working voltage is greater than 60VDC
3nd
3
Reserved.
When above protections are active, the motor shaft will be free or the red LED blinks. Reset the drive by
repowering it to make it function properly after removing above problems.
12. Troubleshooting
In the event that your drive 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.
Symptoms
Possible Problems
Motor is not rotating
No power
Microstep resolution setting is wrong
DIP switch current setting is wrong
Fault condition exists
The drive is disabled
Motor rotates in the wrong direction
Motor phases may be connected in reverse
The drive in fault
DIP switch current setting is wrong
Something wrong with motor coil
Erratic motor motion
Control signal is too weak
Control signal is interfered
Wrong motor connection
Something wrong with motor coil
Current setting is too small, losing steps
Motor stalls during acceleration
Current setting is too small
Motor is undersized for the application
Acceleration is set too high
Power supply voltage too low
Excessive motor and drive heating
Inadequate heat sinking / cooling
Automatic current reduction function not being utilized
Current is set too high