SainSmart 2M542 User manual

2-Phase Stepping Motor Driver
2M542
OPERATING MANUAL
Rev. B
Table of contents
Introduction page 2
Specifications page 2
Timing chart page 3
Setting page 4
Current set page 4
Reduce current function page 4
Micro-Steps page 5
Connection page 6
Control signal page 6
Power supply and
Stepping-Motor connect page 8
Troubleshooting page 9
Dimensions page 10

2
Introduction
This product is a high-performance micro-stepping driver.
•Smooth driver
By using micro-stepping, this driver can achieved low-vibration and low-noise.
•Built-in overheat protection
A driver’s internal temperature in excess of 70˚C (158˚F) trigger overheat
protection, and the driver will stop working automatically.
•Adjustable operating current
A digital switch adjusts the level of motor current during operation.
•Bio-polar drive
By using bio-polar drive, this driver is powerful than uni-polar driver and only
needs four wires connected to the stepping motor.
•Automatic reduce current
In the stop state, the driver will reduce the current automatically to limit the heat
generated by the motor and driver.
Specifications
Min Typical Max
Supply Voltage (VDC) 24 36 50
Output Current (Arms)1.0 - 4.2
Logical Input Current (mA) 7 10 16
Input Frequency (KHz) 0 - 200
Low-Active Required Time 2.5 - -
Operation
Environment
Ambient
temperature 0 to +65˚C (+32 to +149˚F) (non-freezing)
Humidity 80% or less (non-condensing)
Surrounding
atmosphere No corrosive gas, dust, water or oil
Storage
Environment
Ambient
temperature -10 to +80˚C (+14 to +176˚F) (non-freezing)
Humidity 80% or less (non-condensing)
Surrounding
atmosphere No corrosive gas, dust, water or oil
Vibration 5.9 m/s
2
or less
Mass 0.26 Kg

3
•Timing chart
Power LED
Pulse input
ON
OFF
ON
OFF
About 2 sec
Pulse input
ON
OFF
DIR input
ON
OFF
> 2 usec
< 1 usec
< 1 usec> 5 usec
> 5 usec
< 1 usec
< 1 usec
ENA input
ON
OFF
Motor
Release
Excitation
About 10 usec
About 10 usec

4
Setting
By switching the following DIP-SWITCH, user can change the output current and
micro-steps of driver.
8
7
6
5
4
3
2
1
D
I
P
O
N
↓
O
N
O
F
F
•Current Set
SW 1SW 2SW 3Current (Arms)
ON ON ON 1.00 A
OFF ON ON
1.46 A
ON OFF ON 1.91 A
OFF OFF ON
2.37 A
ON ON OFF 2.84 A
OFF ON OFF 3.31 A
ON OFF OFF 3.76 A
OFF OFF OFF 4.20 A
•Reduce Current Function
SW 4Function
ON Maintain full current in the stop state
OFF Automatically reduce current in the stop state

5
•Micro-Steps (for 1.8˚basic step)
SW 5SW 6SW 7SW 8Steps/Rev
ON OFF ON ON
800
OFF OFF ON ON 1600
ON
ON
OFF ON
3200
OFF ON ON ON 6400
ON
OFF OFF ON
12800
OFF OFF OFF ON 25600
ON ON ON OFF 1000
OFF ON ON OFF 2000
ON OFF ON OFF 4000
OFF OFF ON OFF 5000
ON ON OFF OFF 8000
OFF ON OFF OFF 10000
ON OFF OFF OFF 20000
OFF OFF OFF OFF 25000

6
Connection
•Control signal
This terminal is used for control signal.
This driver only accepts pulse/dir type signal (1-pulse input type).
PLS+ Photo-couple Positive -
PLS- Pulse signal input
Motor will run one micro-step when driver
receive one pulse.
Low-Active, the internal resistor is 270Ω。
Logical low is 0 ~ 0.5V ;
Logical high is 4 ~ 5V.
Signal width must be larger than 2.5 usec.
DIR+ Photo-couple Positive -
DIR- Direction signal input
Decide the rotational direction.
The internal resistor is 270Ω。
Logical low is 0 ~ 0.5V ;
Logical high is 4 ~ 5V.
Signal width must be larger than 2.5 usec.
ENA+ Photo-couple Positive -
ENA-
Free signal input
When this input be actived (Low-Active),
the driver will shut off the output current
and the motor
will lose its excitation
holding torque.
This, however, will allow
you to adjust the load position manually.
Low-Active, the internal resistor is 270Ω。
Logical low is 0 ~ 0.5V ;
Logical high is 4 ~ 5V.
Signal width must be larger than 2.5 usec.
NOTE For control signal input, 5 VDC can be directly connected and applied. If
signals are used at a voltage above 5 VDC, be sure to connect an
external resistor to prevent the current from exceeding 16 mA.
Applying a voltage beyond 5 VDC without using an external resistor will
damage the internal elements.
Example:
R=0, when using 5VDC;
R=1k and > 1/8 W, when using 12 VDC;
R=2k and > 1/8 W, when using 24VDC.
PLS+
PLS-
DIR+
DIR-
ENA+
ENA-

7
▼Example of connection with a current sink output circuit
Controller
+5 to 24 VDC
0 V
R
Twisted pair cable
Or
Shielded cable
Driver
R
R
0 V
0 V
P
L
S
+
P
L
S
-
D
I
R
+
D
I
R
-
E
N
A
+
E
N
A
-
▼Example of connection with a current source output circuit
Controller
+5 to 24 VDC
R
Twisted pair cable
Or
Shielded cable
Driver
0 V
P
L
S
+
P
L
S
-
D
I
R
+
D
I
R
-
E
N
A
+
E
N
A
-
R
R

8
•Power supply and Stepping-Motor connect
This terminal is used for supply the motor and driver
power. Be careful not to touch the live connections.
GND Power Input Negative The input power must be between 24VDC
to 50VDC.
+V Power Input Positive
A+ Motor Phase A+
Connect the motor wires as defined.
A- Motor Phase A-
B+ Motor Phase B+
B- Motor Phase B+
GND
+V
A+
A-
B+
B-

9
Troubleshooting
When the motor cannot be operated correctly, refer to the contents provided in this
section and take appropriate action. If the problem persists, contact your nearest office.
Phenomenon
Possible cause
Remedial action
The motor is not excited.
The motor’s output shaft
can be turned easily with
the hands. (The motor
equipped with an
electromagnetic brake
can be turned easily with
the hands, once the brake
is released.)
Bad connection of the
motor cable.
Recheck the connections between
the motor and driver. Take
appropriate action and turn on
the power again
Incorrect setting of the
current-adjustment
switch.
Check the rated current of motor
and set the switch to rated
current of motor.
ENA input is active. Dis-active the ENA signal.
Overheat protection is
active.
Shut off the driver’s power and
check the cause of the problem
that had triggered overheat
protection. Take appropriate
action and turn on the power
again

10
Dimension
35
4.5
3
118
25
3
75.5
25.3
86.5
2M542
unit: mm
22.5
4-Ø3.5