I.CH Motion 3P20M User manual

Page
1
OWNER’S GUIDE
3P20M HYBRID STEPPER MOTOR DRIVER
©2020 by I.CH Motion Co.,Ltd..
All Rights Reserved
TECHNICAL DOCUMENT

©I.CH Motion® 2020
ichmo.com
Specifications subject to change without notice.
Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 2
TECHNICAL DOCUMENT
Content
Note:if you have any problems,please
email [email protected] to to contact us.
1. Introduction ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙3
2. Feature ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙3
3. Specification∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙4
4. Operating Environment and Parameters ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙4
5. Definition of Pin Signal ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙5
6. Connections to Controller ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙7
7. Connecting the Motor ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙8
8. Power Supply Selection ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙8
9. Output Current and Microstep Resolution Settings∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙9
10. Wiring Notes ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙11
11. Typical Connection ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙11
12. Sequence Chart of Control Signals∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙12
13. Protection Functions∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙13
14. Frequently Asked Questions ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙14
15. Application ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙14

©I.CH Motion® 2020
ichmo.com
Specifications subject to change without notice.
Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 3
TECHNICAL DOCUMENT
1. Introduction
These two 3 phase motor(3P20M) drivers can be used to drive 3 and 6 wire stepper motor, whose effect is like servo motor. These drivers have
multiple subdivisions, range of current. If you have any interest, please contact us.
2. Feature
Voltage can up to 50VDC
Pulse frequency up to 300 kHz
High cost-effective, ultra-noise
Low heat
TTL compatible input signal
The Current automatically halved at rest
Optical isolation differential signal input
DIP switch current setting with 16 different values
Current peak up to 8.3A

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Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 4
TECHNICAL DOCUMENT
3. Specification
4. Operating Environment and Parameters
Figure 1: Mechanical Specifications
Recommend use side mounting for better heat dissipation.
3P20M
Parameters
Min
Typical
Max
Unit
Output current
2.1
-
8.3(5.9 RMS)
A
Supply voltage
20
36
50
VDC
Logic signal current
7
10
16
mA
Pulse input frequency
0
-
300
kHz
Isolation resistance
500
-
-
MΩ
Cooling
Natural cooling or forced convection
Environment
Avoid dust, oil frost and corrosive gas
Ambient
Temperatur
0℃－+50℃
Humidity
40%RH －90%RH
Operating
Temperature
70℃
Operating Environment
Vibration
5.9m/s2 Max
Storage T emperature
-20℃－+125℃
Weight
Approx. 280 gram (9.88 oz)
118
112
34
112
22.5
4.5
4-Ф
3.5
75.5
25.3
47.8

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Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 5
TECHNICAL DOCUMENT
Elimination of Heat
Driver’s reliable working temperature should be <70℃, and motor working temperature should be <80℃;
Recommend use automatic idle-current reduction mode, namely current automatically be reduced to 60% when motor stops, so as to reduce
driver heating and motor heating.
5. Definition of Pin Signal
The 3P20M has two connectors, connector P1 for control signals connections, and connector P2 for power and motor connections. The following
tables are brief descriptions of the two connectors. More detailed descriptions of the pins and related issues are presented in section 4, 5, 9.
Connector P1 Configurations
Pin Function
Details
PUL+(+5V)
PUL-(PUL)
Pulse signal: In single pulse (pulse/direction) mode, this input
represents pulse signal, effective for each rising edge; 4-5V when
PUL-HIGH, 0-0.5V when PUL-LOW. In double pulse mode (pulse/pulse) ,
this input represents clockwise (CW) pulse，effective for high level. For
reliable response, pulse width should be longer than 1.2μs. Series
connect resistors for current-limiting when +12V or +24V used.
DIR+(+5V)
DIR-(DIR)
DIR signal: In single-pulse mode, this signal has low/high voltage levels,
representing two directions of motor rotation; in double-pulse mode
(set by inside J1), this signal is counter-clock (CCW) pulse, effective for
low level. For reliable motion response, DIR signal should be ahead of
PUL signal by 5μs at least. 4-5V when DIR-HIGH, 0-0.5V when DIR-LOW.
ENA+(+5V)
ENA-(ENA)
Enable signal: This signal is used for enabling/disabling the driver. High
level (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).
Notes: PUL/DIR mode is the default mode,
and under-cover jumper J1 can be
used to switch it to CW/CCW mode.

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Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 6
TECHNICAL DOCUMENT
Selecting CW/CCW or PUL/DIR Mode
There is a jumper J1 (including pin 1 to pin 9) inside the 3P20M specifically for selecting pulse signal mode. Settings for the one-pulse mode
(PUL/DIR) and for the double-pulse mode (CW/CCW) are shown in the following figure. Default mode out of factory is PUL/DIR mode and effective
at rising edge.
Notes: For (c), the user should move R137 (a 0Ωresistor)
to R136 besides setting J1, and let R137 NC (open circuit).
Connector P2 Configurations
Pin Function
Details
GND
DC power ground
VDC
DC power supply, +20VDC－+50VDC, Including voltage fluctuation and
EMF voltage.
U
Motor phase U
V
Motor phase V
W
Motor phase W
Remark: Please note that motion direction is also related to motor-driver wiring matches.
Exchanging the connections of two phases to the driver will reverse motor motion direction.
(a) PUL/DIR mode and effective at rising edge
(b) PUL/DIR mode and effective at falling edge
(c) CW/CCW mode and effective when the
opto-coupler of the fixed level in conducting state
(d) CW/CCW mode and effective when the
opto-coupler of the fixed level in off state

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Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 7
TECHNICAL DOCUMENT
6. Connections to Controller
The 3P20M can accept differential and single-ended control signals (including open-collector, namely common-anode and PNP output, namely
common-cathode). The 3P20M 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 control signals. It’s recommended to use line driver control signals to
increase noise immunity of the driver under an interference environment. Connections to open-collector and PNP signals are illustrated in the
figure 3 and the figure 4.
Figure 3: Connections to open-collector signal (common-anode)
Figure 4: Connections to PNP signal (common-cathode)

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Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 8
TECHNICAL DOCUMENT
7. Connecting the Motor
The connection between the driver and 3-phase stepping motors includes two different kinds of connections, namely delta-connection and
star-connection. Using delta-connection, the performances of the motor under high speed condition are better, but the driver current is higher too
(about 1.73 times the motor coil current); while using star-connection, the driver current equals to the motor coil current.
Figure 5: Motor connections
8. Power Supply Selection
The 3P20M can match medium and small size stepping motors (from NEMA size 17 to 34) made by I.CH Motion or other motor manufactures
around the world. To 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 the
motion speed requirement is low, it’s better to use lower supply voltage to decrease noise, heating and improve reliability.
Regulated or Unregulated Power Supply
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.
Multiple Drivers
It is recommended to have multiple drivers to share one power supply to reduce cost, if the supply has enough capacity. To avoid cross
interference, DO NOT daisy-chain the power supply input pins of the drivers. (Instead, please connect them to power supply separately.)

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Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 9
TECHNICAL DOCUMENT
Selecting Supply Voltage:
The power MOSFETS inside the 3L583M can actually operate within +18 ～50VDC, 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 +24～+ 45V, leaving room for power fluctuation and back-EMF.
9. Output Current and Microstep Resolution Settings
Current Setting
For a given motor, higher driver current will make the motor output more torque, but at the same time causes more heating in the motor and
driver. Therefore, output current is generally set to be such that the motor will not overheat for long time operation. Phase current rating supplied
by motor manufacturer is important in selecting driver current, however the selection also depends on leads and connections.
DIP Setting for Dynamic Current
The 3P20M uses an 8-bit DIP switch to set motor dynamic current, standstill current and microstep resolution, as shown below:
The first four bits (SW1, 2, 3, 4) of the DIP switch are used to set the dynamic current. Select a setting closest to your motor’s required current.
Peak current (A)
RMS (A)
SW1
SW2
SW3
2.1
1.5
OFF
OFF
OFF
2.5
1.8
ON
OFF
OFF
2.9
2.1
OFF
ON
OFF
3.2
2.3
ON
ON
OFF

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Owner's Guide: 3P20M Hybrid Stepper Motor Driver
Page 10
TECHNICAL DOCUMENT
3.6
2.6
OFF
OFF
ON
OFF
4.0
2.9
ON
OFF
ON
OFF
4.5
3.2
OFF
ON
ON
OFF
4.9
3.5
ON
ON
ON
OFF
5.3
3.8
OFF
OFF
OFF
ON
5.7
4.1
ON
OFF
OFF
ON
6.2
4.4
OFF
ON
OFF
ON
6.4
4.6
ON
ON
OFF
ON
6.9
4.9
OFF
OFF
ON
ON
7.3
5.2
ON
OFF
ON
ON
7.7
5.5
OFF
ON
ON
ON
8.3
5.9
ON
ON
ON
ON
Notes: Due to motor inductance, the actual current in the
coil may be smaller than the dynamic current
settings, particularly under high speed condition.
DIP Setting for Standstill Current
SW5 is used for this purpose. OFF meaning that the standstill current is set to be half of the selected dynamic current, and ON meaning that
standstill current is set to be the same as the selected dynamic current. The current automatically reduced to 60% of the selected dynamic current
0.5 second after the last pulse when use automatic idle-current reduction mode. Theoretically, this will reduce motor heating to 36% (due to
P=I2*R) of the original value.

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Microstep Resolution Setting
Microstep resolution is set by SW6, 7, 8 of the DIP switch as shown in the following table:
10. 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 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 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.
11. Typical Connection
A complete stepping system should include stepping motor, stepping driver, power supply and controller (pulse generator). A typical connection is
shown in the Figure 6.
Steps/rev.
SW6
SW7
SW8
200
ON
ON
ON
400
OFF
ON
ON
500
ON
OFF
ON
1000
OFF
OFF
ON
2000
ON
ON
OFF
4000
OFF
ON
OFF
5000
ON
OFF
OFF
10000
OFF
OFF
OFF

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Figure 6: Typical connection
12. Sequence Chart of Control Signals
In order to avoid some fault operations and deviations, PUL, DIR and ENA signals should abide by some rules, as shown in the figure 7:
Figure 7: Sequence chart of control signals

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Remark:
a)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.
b)t2: DIR must be ahead of PUL effective edge by 5µs to ensure correct direction;
c)t3: Pulse width not less than 1.5µs;
d)t4: Low level width not less than 1.5µs.
13. Protection Functions
To improve reliability, the driver incorporates some built-in protections features.
Over-voltage and Short-voltage Protections
When power supply voltage exceeds +51VDC, protection will be activated and power indicator LED will turn red. When over-voltage protection
function is active, the user should repower the driver to reset the driver.
Short-voltage Protection
When power supply voltage is lower than +18VDC, the Green LED will turn off and the Red LED will light. Both green and red LED will turn off when
power supply voltage is lower than +16VDC. The driver will be reset after power supply voltage increase to +20VDC automatically.
Short Circuit Protection
Protection will be activated in case of short circuit between motor coil and ground. When short circuit protection function is active, the user should
repower the driver to reset the driver.
Over-current Protection
Protection will be activated in case of over current which may otherwise damage the driver.
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.

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14. Frequently Asked Questions
In the event that your 3P20M 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
No power
Microstep resolution setting is wrong
DIP switch current setting is wrong
Fault condition exists
Motor is not rotating
The driver is disabled
Motor rotates in the wrong direction
Motor phases may be connected in reverse
DIP switch current setting is wrong
The driver in fault
Something wrong with motor coil
Control signal is too weak
Control signal is interfered
Wrong motor connection
Something wrong with motor coil
Erratic motor motion
Current setting is too small, losing steps
Motor stalls during acceleration
Motor is undersized for the application
Acceleration is set too high
Motor stalls during acceleration
Powersupply voltage too low
Inadequate heat sinking/cooling
utomatic current reduction function not being
utilized
Excessive motor and driver heating
Current is set too high
15. Application
It is suitable for many stepper motors, from NEMA 17 to NEMA 34. It can be used in many machines, such as pick-place devices, engraving
machines and so on. It is an ideal solution for the application that requires low-speed smoothness and high speed performance.