Anaheim Stepper MLP08041 Users Guide

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MLP08041
High Performance Microstepping Driver
User’s Guide
910 East Orangefair Lane, Anaheim, CA 92801
e-mail: [email protected](714) 992-6990  fax: (714) 992-0471
website: www.anaheimautomation.com
ANAHEIM AUTOMATION 
						

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MLP08041 High Performance Microstepping Driver Features
•  High Torque Output
•  Output Current 10.0 Amps Peak
•  200 to 800 steps/rev (1,2, and 4 selectable step operations)
•  Short Circuit Protection
•  Over-Temperature and Over/Under-Voltage Shutdown
•  No Minimum Inductance
•  Optical Isolation
•  Motor ON/OFF input
Introduction
The MLP08041 High Performance Microstepping Driver has an output current capability of 2.0 Amps mini-
mum to 10.0 Amps maximum (Peak Rating). The MLP08041 driver operates with either an AC voltage of
35-132 Volts or  a DC voltage of 50-185 Volts. The inputs are optically isolated (+5VDC minimum to +7VDC
maximum). The clock input is set to receive either positive or negative edge clocks with a maximum
frequency of 40KHz. The MLP08041 driver offers direction control and motor current ON/OFF capabilities.
The Reduce Current Enabled automatically reduces motor current to 50% of set value after the last step is
made. The driver has built-in features to indicate power on (Green LED),  fault conditions (Red LEDs), and
Open Collector output.
With the MLP08041, various step resolutions can be implemented by the onboard jumpers. These divi-
sions range from 200 steps per revolution to 800 steps per revolution. The bipolar drive configuration
handles 4, 6 and 8 lead motors. Protection devices have been added to this driver for Phase to Phase
Short-Circuit, Motor Mis-Wire, Over-Temperature and Over/Under-Voltage conditions.
Pin Descriptions
The inputs on the MLP08041 are optically isolated with the anode (+) and cathode (-) both brought out to
the user.  With no current going through the Clock and Direction opto-diodes, the input is considered high.
To enable the Motor On/Off input, current must go through the opto-diode. To enable the input a minimum
of 1.0 mA needs to be sourced or sinked through the opto-diode. This is done simply by placing a voltage
of +5 to +7 VDC across the two inputs of the opto-diode. If sourcing current into the inputs, then all three
cathodes (-) should be tied together and grounded as shown in Figure 4. If sinking current, then all three
anodes (+) should be tied together to the +voltage as shown in Figure 3. The Ready output on the MLP08041
is an opto-decoupled open collector output. When normal operation occurs, this output will conduct cur-
rent into the emitter. Care must be taken not to pass more than 50mA through this transistor.
Optically Isolated Inputs
The following inputs to the MLP08041 are Optically Isolated.
To enable an input, apply a DC voltage source of +5VDC to +7VDC across the inputs. The Anodes (+) are
pins 1, 3, and 5 and the Cathodes (-) are pins 2, 4, and 6.
Table 1: Optically isolated pinout 
						

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P1: 8 Pin Input Terminal Description
Table 2: Pin descriptions for input terminal connector (P1)
TB1: 6 Pin Motor Terminal Description
Table 3: Pin descriptions for motor terminal block connector (TB1)
Power Supply Requirements
The MLP08041 has an input line voltage ranging from 35-130VAC. TB1 pin 2 is used as the hot terminal
and is internally fused, TB1 pin 1 is used as the neutral terminal. A DC input of 50-185 volts can also be
used to power the drive. To connect the DC to the drive, place the positive voltage wire on TB1 pin 2 and
place the ground wire on the TB1 pin 1. 
						

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Absolute Maximum Ratings
Input Voltage: 132 VAC or 185 VDC
Output Current: 10.0 AMPS PEAK
Max Plate Temperature: 70° C
Storage Temperature: 0° to +50° C
Input Voltage (For isolated inputs):  +7V at 1mA
Ready Output Signal: Open Collector max. 30V / 50mA (optically isolated)
Electrical Specifications
Table 4: MLP08041 electrical specifications 
						

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Hook Up Drawings
Figure 1: Hook up for current sinking inputs
Figure 2: Hook up for current sourcing inputs 
						

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Motor Selection
The MLP08041 is a Bipolar Microstep Driver that is compatible with both Bipolar and Unipolar Motor
Configurations, (i.e. 8 and 4 lead motors, and 6 lead center tapped motors).
Step motors with low current ratings and high inductance will perform better at low speeds, providing
higher low-end torque. Motors with high current ratings and low inductance will perform better at higher
speeds, providing more high-end torque. Higher voltages will cause the current to flow faster through the
motor coils. This in turn means higher step rates can be achieved. Care should be taken not to exceed the
maximum voltage of the driver.
Since the MLP08041 is a constant current source, it is not necessary to use a motor that is rated at the
same voltage as the supply voltage. What is important is that the MLP08041 is set to the appropriate
current level based on the motor being used.  Refer to the following chart for setting the current potentiom-
eter based on the current code in the part number of the motor. Examples of motor part numbers are
shown below. Anaheim Automation offers a comprehensive line of step motors in 14, 17, 23, 34 and 42
frame sizes. Contact the factory to verify motor compatibility with the MLP08041.
Step Motor Current Setting Guide
Anaheim Automation offers motor cable, making hook-ups quick and easy!
Contact the factory or visit our website for more motor and cable offerings.
Table 5: Table selection for Anaheim Automation motor current settings 
						

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Microstep Selection
Jumpers JP3 and JP4 select the microstep resolution of the driver. Table 6 shows the standard resolution
values along with the associated positions for the select switches. The standard waveforms are sinusoi-
dal. The steps/rev are based on a 200 step/rev motor.
Setting the Output Current
The output current on the MLP08041 is set by an onboard potentiometer. This potentiometer determines
the per phase peak output current of the driver. The relationship between the output current and the
potentiometer value is as follows:
Table 7:  Potentiometer values with respect to the output current
Refer to Table 5 for specific motor current settings.Table 6: Microstep selection on JP4 and JP3
** Current settings above 7.6 Amps (70%)  may require additional cooling. 
						

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When configuring the motor in a series configuration (connected from end to end with the center tap
floating) use the specified per Phase (or unipolar) current rating to determine the current setting potenti-
ometer value.
Reducing Output Current
Reducing the output current is automatically set and occurs approximately 1 second after the last positive
going edge of the step clock input. The amount of current per phase in the reduction mode is approxi-
mately 50% of the set current.
Determining Output Current
The output current for the motor used when microstepping is determined differently from that of a full/half
step unipolar driver. In the MLP08041, a sine/cosine output function is used in rotating the motor. The
output current for a given motor is determined by the motors current rating and the wiring configuration of
the motor. There is a current adjustment potentiometer used to set the output current of the MLP08041.
This sets the peak output current of the sine/cosine waves. The specified motor current (which is the
unipolar value) is multiplied by a factor of 1.0, 1.4, or 2.0 depending on the motor configuration (series,
half-coil, or parallel).
Step Motor Configurations
Step motors can be configured as 4, 6, or 8 leads. Each configuration requires different currents. Refer to
the lead configurations and the procedures to determine their output current.
WARNING! Step motors will run hot even when configured correctly. Damage may occur to the motor if
a higher than specified current is used. Most specified motor currents are maximum values. Care
should be taken to not exceed these ratings.
6 Lead Motors
When configuring a 6 lead motor in a half-coil configuration (connected from one end of the coil to the
center tap), multiply the specified per Phase (or unipolar) current rating by 1.4 to determine the current
setting potentiometer value. This configuration will provide more torque at higher speeds when compared
to the series configuration. 
						

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4 Lead Motors
Multiply the specified series motor current by 1.4 to determine the current adjustment potentiometer
value. Four Lead Motors are usually rated with their appropriate series current, as opposed to the Phase
Current, which is the rating for 6 and 8 lead motors.
8 Lead Motors
Series Connection: When configuring the motor windings in series, use the per Phase (or unipolar)
current rating to determine the current setting potentiometer value.
Parallel Connection: When configuring the motor windings in parallel, multiply the per Phase (or unipo-
lar) current rating by 2.0 to determine the current setting potentiometer value.
NOTE: After the current has been determined, according to the motor connections above, use Table 3 to
choose the proper setting for the current setting potentiometer. 
						

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Connecting the Step Motor
Phase 1 and 3 of the step motor is connected between pins 1 and 2 on the motor connector (TB2).  Phase
2 and 4 of the step motor is connected between pins 3 and 4 on the motor connector (TB2).  The motors
case should be grounded to pin 5 on the motor connector (TB2) for protection. Refer to Figures 1 and 2 for
TYPICAL APPLICATION HOOK-UP.
NOTE: The physical direction of the motor with respect to the direction input will depend on the connection
of the motor windings.  To reverse the direction of the motor with respect to the direction input, swap the
wires on Phase 1 and  Phase 3.
WARNING: Do not connect or disconnect motor wires while power is applied!
Short-Circuit, Mis-Wire, and Over-Current Conditions
If it is found that there is a condition that causes on over current in the driver phase transistors, the Red
LED CR22 will turn on solid and power will be shut off to the motor.  To reset the drive turn power off,
check wiring, and turn power back on.
Over-Temperature
If it is found that there is an over temperature on the heat sink, the Red LED CR23 will turn on solid and
power will be shut off to the motor.  To reset the drive turn power off, check wiring, and turn power back on.
Over/Under-Voltage Conditions
If it is found that there is an over or under voltage on the motor bus voltage,  the Red LED CR24 will turn
on solid and power will be shut off to the motor.  To reset the drive turn power off, check wiring, and turn
power back on.