WOBIT SMC124 User manual

P.P.H. WObit E.K.J Ober. s.c.
62-045 Pniewy, Dęborzyce 16
tel.[phone], fax.[phone]
e-mail: [email protected]
www.wobit.com.pl
SMC124
User Manual
Stepper motor driver
0,5 –3,6 A Step resolution 1/2 - 1/128

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User Manual - SMC124–15.07.2015 –v.1.2
Page 2
Contains
1. Safety and assembly rules .............................................................................................................. 3
1.1 Safety rules.............................................................................................................................. 3
1.2 Assembly recommendation..................................................................................................... 3
2. Device description .......................................................................................................................... 4
2.1 Device designation .................................................................................................................. 4
2.2 Description of connectors and signalizing indicators.............................................................. 4
2.3 Power supply ........................................................................................................................... 4
2.4 Connection of the driver ......................................................................................................... 5
2.5 Controlling inputs .................................................................................................................... 5
2.6 Description of configuration switches..................................................................................... 6
2.7 Thermal and overload protection ........................................................................................... 6
3. Technical parameters ..................................................................................................................... 7
Thank you for selecting our product!
This instruction will help you at correct service and accurate exploitation of described device.
Information included in this instruction were prepared with high attention by our specialists and is description of the
product. Based on the information should not be inferred a certain features or suitability for a particular application. This
information does not release the user from the obligation of own judgment and verification. P.P.H. WObit E.K.J. Ober s.c.
reserves the right to make changes without prior notice.
Please read instructions below carefully and adhere to its recommendation
Please pay special attention to the following characters:
CAUTION!
Not adhere to instruction can cause damage or impede the use of hardware or software.

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User Manual - SMC124–15.07.2015 –v.1.2
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1. Safety and assembly rules
1.1 Safety rules
Prior to first start-up of the device carefully read the manual.
Prior to first start-up of the device make sure all cables are properly connected.
Provide appropriate working conditions, in compliance with the device
specifications (e.g.: power supply voltage, temperature, maximum current
consumption).
Prior to any modifications of cables connections, disconnect power supply voltage.
Driver can achieve high temperatures at longer operation and full load; hot housing can
cause burn!
1.2 Assembly recommendation
It is recommended to use the following means preventing against possible interruptions of the device
operation:
1. To minimize noises, cable which connect motor with driver should be shielded or twisted in
pairs (separate twisted pair for A and B phase). It is also recommended to use a ferrite ring
on motor cable at controller.
2. Signal cables (CLK, DIR, EN) should be move away from power supply line and motor wires
and should be possibly short.
3. Setting too high current for weaker motor cause its asynchronous operation, especially at set
higher step division (motor coils saturation). In longer period of time it cause stronger
heating of the motor, and in consequence it leads to its damage.
4. At operations with high currents please provide its proper cooling. It is recommended to not
Mount the driver in control cabinet without additional air circulation.
CAUTION!
During driver operation with higher currents (>3A) it can achieve higher temperatures.
To provide its proper operation please provide proper cooling by forced air circulation. Driver
operations in closed control cabinet without forced air circulation can cause its overheating and
turning off.

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User Manual - SMC124–15.07.2015 –v.1.2
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2. Device description
2.1 Device designation
SMC124 is designed for operation with two phase stepper motor with bipolar winding (4-wires) or
unipolar (6 or 8-wires) used as bipolar. It allows control with step resolution in range 1/2 up to 1/128
forcing constant current value in winding independently of voltage supply value.
Features of SMC124:
Driver voltage supply 12…36 VDC.
Regulated current of motor winding 0,5…3,6A
Step resolution: 1/2, 1/8, 1/10, 1/16, 1/20, 1/32, 1/64, 1/128
Automated current reduction
Opt insulated inputs
Diodes signalizing driver operations status
Overload and thermal protection
Small dimensions
Housing adapted for mounting on DIN rail
2.2 Description of connectors and signalizing indicators
Picture. 1 Description of connectors and indicators of SMC124 driver.
No
Description
Inputs
POWER
Power supply input 12…36 VDC
MOTOR
Output for connection of stepper motor phases
EN
Enable input
DIR
Direction input
CLK
Clock input
Signalizing diodes
D1
Signalization of driver power supply
D2
Signalization of active ENABLE input (enable for operation)
D3
Signalization of active DIR input (change of operation
direction)
DP –configuration switch
2.3 Power supply
For supplying the driver it is recommended to use a non stabilized power supply unit (PSU) with
output voltage in range +12…+36V. PSU must receive motor return energy which provides output
capacitors with capacity at least 4700µF.
Minimal current efficiency of supply source should be selected according to relationship below:
Izas = 12/Uzas*Ister
where, Izas –minimal current efficiency of power supply, Uzas –voltage supply, Ister –set current of the driver.

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Exemplary values of current efficiencies of used power supply:
Motor current [A]
Power supply [V]
1
2
3
12
1A
2A
3A
24
0,5A
1A
2A
36
0,4A
0,8A
1,5A
CAUTION!
Reverse polarity or exceeding maximal voltage supply can cause damage of the driver.
During operation with high voltage supply and large motor which operates dynamically (rapid
decreasing of its velocity), too small output capacitors or lack of them can damage the driver or
cause its incorrect operation.
2.4 Connection of the driver
Motor should be connect to the driver using 4-wire cable. To minimize noises it is recommended to
use twisted pair cable (A with /A, B with /B), for the best shielded. In case of unipolar motors (with 6
or 8 derivations) connection can be made serial or parallel.
Connection of 4 –wire motor
Example of connection of bipolar stepper motor
Serial connection of 8(6)-wires motor
Coiling connected serially to achieve higher maximal torque
of the motor decreasing of its dynamics.
Parallel connection of 8-wires motor
Coiling connected parallels to achieve higher maximal motor
velocity and better operational dynamics
Increased maximal current/phase in relation to rated current
x1,4 (for example motor with current 2A, can be operated with
max. current 2,8A).
CAUTION!
Do not disconnect motor from the driver during its operation. It can cause damage of the driver.
2.5 Controlling inputs
All controlling inputs (CLK, DIR, ENABLE) are opt insulated. It operates with 5V (high state 3..6V). To
control from voltage level 24 V into a row with controlling signals insert resistors with value
1,5..2,2k.
Controlling signals should be connected according to scheme below:

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Table of driver operations states
State
Input
ENABLE
DIR
CLK
Turned off drive (motor don’t hold the torque)
OFF
X
X
Turned on drive (motor hold the torque)
ON
X
OFF / ON
Motor rotations „*right”
ON
OFF
Motor rotations „*left”
ON
ON
ON –active input; X –not important; * directions taken conventionally
2.6 Description of configuration switches
Configuration of the driver is made by 1-8 switches on driver panel:
Division
S1
S2
S3
½
OFF
OFF
OFF
1/8
ON
OFF
OFF
1/10
OFF
ON
ON
1/16
OFF
ON
OFF
1/20
ON
ON
ON
1/32
ON
ON
OFF
1/64
OFF
OFF
OFF
ON
1/128
ON
OFF
ON
Current
I1
I2
I3
I4
0,5
OFF
OFF
OFF
OFF
1,2
ON
OFF
OFF
OFF
1,6
OFF
ON
OFF
OFF
2,0
ON
ON
OFF
OFF
2,5
OFF
OFF
ON
OFF
2,7
ON
OFF
ON
OFF
2,8
OFF
ON
ON
OFF
2,9
ON
ON
ON
OFF
3,0
OFF
OFF
OFF
ON
3,1
ON
OFF
OFF
ON
3,2
OFF
ON
OFF
ON
3,3
ON
ON
OFF
ON
3,4
OFF
OFF
ON
ON
3,5
ON
OFF
ON
ON
3,6
OFF
ON
ON
ON
3,6
ON
ON
ON
ON
R= ON -> I max. = 50% (current
reduction)
Current reduction (R): After activation of reduction current will be reduced by about 50%, when CLK
signal frequency on CLK input is lower than <1,5 Hz.
2.7 Thermal and overload protection
Occurring of current or voltage overload cause turning off of the drive. Its restart is possible after
reset of power supply.

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User Manual - SMC124–15.07.2015 –v.1.2
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Driver overheating (exceeding of allowable temperature) cause turning off of the drive. Driver will be
restart after limiting temperature of the driver.
3. Technical parameters
Description
Parameter
Power supply
12 … 36 VDC,
Motor phase current
0,5…3,6A
Step resolution
1/2, 1/8, 1/10, 1/16, 1/20, 1/32, 1/64, 1/128
Controlling signals CLK,DIR,EN
Low state: <2V, high state 5V
CLK controlling signal
Max. frequency 200khz
Pulse width min. 5 µs
Environment temperature range
0°C…+30°C
Operating temperature range
0°C…+80°C
Housing
Dimensions: 60 x 110 x 21 mm
Degree of protection: IP40
Mounting: handle for DIN rail