ECG M335 User manual

M335 Microstepping Driver Manual V1.0 ECG- SAVEBASE
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User Manual of M335
High Performance Microstepping Driver

M335 Microstepping Driver Manual V1.0 ECG- SAVEBASE
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1Introduction, Features and Application
1.1 Introduction
The M335 is a high performance microstepping driver with low price. The M335 adopts
single-chip PWM bipolar sinusoidal chopper to ensure the low vibration and high efficiency. It is
suitable for driving 2-phase and 4-phase hybrid stepping motors, so the Nema16-Nema23 stepper
motors with a 0.5A-3.5A current will be suitable. If you are looking for a device with low cost,
low noise and high-speed, this is an excellent choice for you.
1.2 Features
Low cost, Low noise and high-speed.
1, 2, 8, 16 adjustable micro step control for more accurate and smoother motor running.
Supply voltage up to 30V DC.
Output current up to 3.5A.
Single-chip PWM bipolar sinusoidal chopper ensures low vibration and high efficiency
Automatic idle-current reduction.
Suitable for 2-phase and 4-phase motors.
Pulse input frequency up to 400 KHz.
Protection of power reversal.
High speed optoelectronic isolation signal input.
Non-creeping phenomenon under low speed. Low noise and non-resonant region.
1.3 Application
Suitable for a variety of small and medium sized automation equipment and instruments, such as:
engraving machine, marking machine, cutting machine, laser typesetting, plotters, CNC machine
tools, handling the devices.

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2Specifications
2.1 Electrical Specifications
2.2 Operating Environment & Other Specifications
Cooling
Natural Cooling
Operating
Environment
Environment
Avoid dust, oil fog, corrosive gas
Ambient Temperature
0℃-+50℃
Operating Temperature
70℃(158︒F)
Humidity
40-90% RH9
Vibration
5.9m/S2 Max
Storage Temperature
-20℃-125℃
Weight
Approx.200g
Parameters
M335
Min
Typical
Max
Unit
Output Current
0.6
3A
A
Supply Voltage
+12
+24
+30
VDC
Logic Signal Current
7
10
16
mA
Pulse Input Frequency
0
-
300
KHZ
Isolation Resistance
500
MΩ

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2.3 Mechanical Specification
Figure 2.3 Mechanical Specification
Note: Recommend use side mounting for better heat dissipation Elimination of Heat
3Interface and wiring Introduction
3.1 Weak Current Interface Description
Pin Function
Details
PUL+(+5V)
Pulse signal: Single pulse(pulse/direction) mode. 4-5V when PLU-HIGH,
0-0.5V when PUL-LOW. For reliable response, pulse width should be longer
than 1.5uS. Series connect resistors for current-limiting when +12V or +24V
used.
PUL-
DIR（+5V）
DIR signal: This signal has low/high voltage levels, representing two directions
of motor rotation; For reliable motion response, DIR signal should be ahead of

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3.2 Strong Current Interface Description
Pin Function
Details
DC+
Power supply, 12~30 VDC. Recommend voltage:24V
DC-
A+, A-
Motor Phase A
B+, B-
Motor Phase B
3.3 Input Interface Description
The M335 can accept differential and single-ended inputs (including open-collector and PNP
output). The M335 has 3 optically isolated logic inputs which are located on connector P1 to
accept line driver control signals. These inputs are isolated to minimize or eliminate electrical
noises coupled onto the drive control signals. We recommend to use line driver control signals to
increase noise immunity of the driver in interference environments. In the following figures,
connections to open-collector and PNP signals are illustrated.
DIR-
PUL signal by 5μs at least. 4-5V when DIR-HIGH, 0-0.5V when DIR-LOW.
Please note that motion direction is also related to motor-driver wiring match.
Exchanging the connection of two wires for a coil to the driver will reverse
motion direction.
EN+（+5V）
Enable signal: (NPN control signal, PNP and Differential control signals are on
the contrary, namely Low level for enabling.) for enabling the driver and low
level for disabling the driver. Usually left UNCONNECTED (ENABLED)
EN-

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Figure 3.3-1 Connections to open-collector signal (common-anode)
Figure 3.3-2 Connection to PNP signal (common-cathode)

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3.4 Sequence Chart of Control Signal
Figure 3.4 Sequence chart of control signals
Remark:
(1) t1: ENA must be ahead of DIR by at least 5μs. Usually, ENA+ and ENA- are NC (not
connected). See “Connector P1 Configurations”for more information.
(2) t2: DIR must be ahead of PUL effective edge by at least 5μs to ensure correct direction;
(3) t3: Pulse width not less than 1.5μs;
(4) t4: Low level width not less than 1.5μs.
3.5 Wiring Notes
In order to improve anti-interference performance of the driver, it is recommended to use
twisted pair shield cable.
To prevent noise incurred in pulse/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.

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If a power supply serves several drivers, separately connecting the drivers is recommended
instead of daisy-chaining.
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.
4Selecting Microstep Resolution, Decay mode and
Driver Output Current
This driver uses a 6-bit DIP switch to set micro step resolution, motor operating current and decay
mode as shown in the following figure:
4.1 Microstep Resolution Selection
Microstep resolution is set by SW1, 2 of the DIP switch as shown in the following table:
SW1
SW2
Microstep resolution
OFF
OFF
1
ON
OFF
1/2
ON
ON
1/8
OFF
ON
1/16
Note: For smooth operation, please try to choose high segmentation, such as 1/16 segmentation
SW1
SW2
SW3
SW4
SW5
SW6
Microstep Resolution
Dynamic Current
Decay Mode

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4.2 Current Settings
Output current is set by SW3, 24of the DIP switch as shown in the following table:
SW3
SW4
Full Current
Auto Half Current
Peak Current
RMS
Peak Current
RMS
OFF
OFF
3A
2.14A
1.5A
1.07A
ON
OFF
2.25A
1.6A
0.6A
0.42A
OFF
ON
1.5A
1.07A
1.5A
1.07A
ON
ON
0.6A
0.42A
0.6A
0.42A
Note: Output current is automatically switched to 50% after signal pulse stop for about 0.4
seconds (according to the table settings). This can make the motor and drive heating reduction,
improved reliability. Theoretically 25% reduction in the heat (heat is proportional to the square of
the current).
4.3 Decay Mode Settings
With the decay mode from 0% to 100%, the attenuation increases. Users can eliminate the stepper
motor locked noise and improve motion stabilization by switch SW5, SW6.
SW5
SW6
Decay Mode
OFF
OFF
No Decay
ON
OFF
Slow Decay
OFF
ON
Medium Speed Decay
ON
ON
Fast Decay
5Power supply selection
The M335 can match medium and small size stepping motors (from NEMA size 14 to 23) .To

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achieve 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 your speed requirement is low, it is better to use lower supply voltage to decrease noise,
heating and improve reliability.
Both regulated and unregulated power supplies can be used to supply the driver. However,
unregulated power supplies are preferred due to their ability to withstand current surge. If
regulated power supplies (such as most switching supplies.) are indeed used, it is important to
have large current output rating to avoid problems like current clamp, for example using 4A
supply for 3A motor-driver operation. On the other hand, if unregulated supply is used, one may
use a power supply of lower current rating than that of motor (typically 50%～70% of motor
current). The reason is that the driver draws current from the power supply capacitor of the
unregulated supply only during the ON duration of the PWM cycle, but not during the OFF
duration. Therefore, the average current withdrawn from power supply is considerably less than
motor current. For example, two 3A motors can be well supplied by one power supply of 4A
rating.
The power MOSFETS inside the M335 can actually operate within +12～30VDC, including
power input fluctuation and back EMF voltage generated by motor coils during motor shaft
deceleration. 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 driver damage. Therefore, it is suggested to
choose only sufficiently high supply voltage for intended applications, and it is suggested to use
power supplies with theoretical output voltage of +12～+ 24V, leaving room for power fluctuation
and back-EMF
6Connections to Stepping Motors
6.1 Connections to 4-lead Motors
4 lead motors are the least flexible but easiest to wire. Speed and torque depends on winding
inductance. In setting the driver output current, multiply the specified phase current by 1.4 to
determine the peak output current.

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Figure 6.1 4-lead Motor Connections
6.2 Connections to 6-lead Motors
Like 8 lead stepping motors, 6 lead motors have two configurations available for high speed or
high torque operation. The higher speed configuration, or half coil, is so described because it uses
one half of the motor’s inductor windings. The higher torque configuration, or full coil, uses the
full windings of the phases.
Half Coil Configurations
As previously stated, the half coil configuration uses 50% of the motor phase windings. This gives
lower inductance, hence, lower torque output. Like the parallel connection of 8 lead motor, the
torque output will be more stable at higher speeds. This configuration is also referred to as half
chopper. In setting the driver output current multiply the specified per phase (or unipolar) current
rating by 1.4 to determine the peak output current.
Figure 6.2-1 6-lead motor half coil (higher speed) connections
Full Coil Configurations

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The full coil configuration on a six lead motor should be used in applications where
higher torque at lower speeds is desired. This configuration is also referred to as full
copper. In full coil mode, the motors should be run at only 70% of their rated current
to prevent overheating.
Figure 6.2-2 6-lead motor full coil (higher torque) connections
6.3 Connections to 8-lead Motors
8 lead motors offer a high degree of flexibility to the system designer in that they may be
connected in series or parallel, thus satisfying a wide range of applications.
Series Connections
A series motor configuration would typically be used in applications where a higher torque at
lower speeds is required. Because this configuration has the most inductance, the performance will
start to degrade at higher speeds. In series mode, the motors should also be run at only 70% of
their rated current to prevent overheating.
Figure 6.3-1 8-lead motor series connections

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Parallel Connections
An 8 lead motor in a parallel configuration offers a more stable, but lower torque at lower speeds.
But because of the lower inductance, there will be higher torque at higher speeds. Multiply per
phase (or unipolar) current rating by 1.96, or the bipolar current rating by 1.4, to determine the
peak output current.
Figure 6.3-2 8-lead motor parallel connections

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7Frequently Asked Questions