Anaheim Stepper MLP08641 Users Guide

							#L010150February 2004
MLP08641 MLP08641MLP08641 MLP08641
MLP08641
High Performance Microstepping Driver High Performance Microstepping DriverHigh Performance Microstepping Driver High Performance Microstepping Driver
High Performance Microstepping Driver
User’s Guide User’s GuideUser’s Guide User’s Guide
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 ANAHEIM AUTOMATIONANAHEIM AUTOMATION ANAHEIM AUTOMATION
ANAHEIM AUTOMATION 
						

							#L010150February 2004
MLP08641 High Performance Microstepping Driver Features MLP08641 High Performance Microstepping Driver FeaturesMLP08641 High Performance Microstepping Driver Features MLP08641 High Performance Microstepping Driver Features
MLP08641 High Performance Microstepping Driver Features
•  Size 6.500L x 2.150W x 5.400H •  Size 6.500L x 2.150W x 5.400H•  Size 6.500L x 2.150W x 5.400H •  Size 6.500L x 2.150W x 5.400H
•  Size 6.500L x 2.150W x 5.400H
•  High Torque Output •  High Torque Output•  High Torque Output •  High Torque Output
•  High Torque Output
•  Output Current 8.0 Amps Peak •  Output Current 8.0 Amps Peak•  Output Current 8.0 Amps Peak •  Output Current 8.0 Amps Peak
•  Output Current 8.0 Amps Peak
•  200 to 12,800 steps/rev (1,2,5,8,10,16,32 and 64 selectable step operations) •  200 to 12,800 steps/rev (1,2,5,8,10,16,32 and 64 selectable step operations)•  200 to 12,800 steps/rev (1,2,5,8,10,16,32 and 64 selectable step operations) •  200 to 12,800 steps/rev (1,2,5,8,10,16,32 and 64 selectable step operations)
•  200 to 12,800 steps/rev (1,2,5,8,10,16,32 and 64 selectable step operations)
•  Short Circuit Protection •  Short Circuit Protection•  Short Circuit Protection •  Short Circuit Protection
•  Short Circuit Protection
•  Over-Temperature and Over-Voltage Shutdown •  Over-Temperature and Over-Voltage Shutdown•  Over-Temperature and Over-Voltage Shutdown •  Over-Temperature and Over-Voltage Shutdown
•  Over-Temperature and Over-Voltage Shutdown
•  No Minimum Inductance •  No Minimum Inductance•  No Minimum Inductance •  No Minimum Inductance
•  No Minimum Inductance
•  Optical Isolation •  Optical Isolation•  Optical Isolation •  Optical Isolation
•  Optical Isolation
•  Motor ON/OFF input •  Motor ON/OFF input•  Motor ON/OFF input •  Motor ON/OFF input
•  Motor ON/OFF input
Introduction IntroductionIntroduction Introduction
Introduction
The MLP08641 High Performance Microstepping Driver has an output current capability of 1.5 Amps
minimum to 8.0 Amps maximum (Peak Rating). The MLP08641 driver operates with either an AC voltage
of 20-132 Volts or  a DC voltage of 30-185 Volts. The inputs are optically isolated with a minimum sourcing
of 7.0 mA per input (+5VDC minimum to +24VDC maximum). The clock input is set to receive either
positive or negative edge clocks with a maximum frequency of 400KHz. The MLP08641 driver offers
direction control and motor current ON/OFF capabilities. The Reduce Current Enabled automatically re-
duces motor current to 70% of set value after the last step is made (1sec delay). The driver has built-in
features to indicate power on (Green LED), Clocks being received (Yellow LED) and fault conditions (Red
LED).
With the MLP08641, various step resolutions can be implemented by the onboard dip switch. These
divisions range from 200 steps per revolution to 12,800 steps per revolution. The bipolar drive configura-
tion 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-Voltage conditions.
Pin Descriptions Pin DescriptionsPin Descriptions Pin Descriptions
Pin Descriptions
The inputs on the MLP08641 are optically isolated with the anode (+) and cathode (-) both brought out to
the user.  With no current going through the opto-diode, the input is considered high. To enable the input
a minimum of 7.0 mA needs to be sourced or sinked through the opto-diode. This is done simply by
placing a voltage of +5 to +24 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.
Optically Isolated Inputs Optically Isolated InputsOptically Isolated Inputs Optically Isolated Inputs
Optically Isolated Inputs
The following inputs to the MLP08641 are Optically Isolated.
To enable an input, apply a DC voltage source of +5VDC to +24VDC across the inputs. The Anodes (+)
are pins 1, 3, and 5 and the Cathodes (-) are pins 2, 4, and 6.
m e t I# n i P
k c o l C2& 1
n o i t c e r i D4& 3
f f O / n O6& 5
Table 1: Optically isolated pinout 
						

							#L010150February 2004
# n i P#n i P
# n i P# n i P#n i Pn o i t p i r c s e Dno i t p i r c s e D
n o i t p i r c s e Dn o i t p i r c s e Dno i t p i r c s e D
1 1
1 11: ) + ( e d o n A t u p n I k c o l C p e t S:) + ( e d o n A t u p n I k c o l C p e t S
: ) + ( e d o n A t u p n I k c o l C p e t S: ) + ( e d o n A t u p n I k c o l C p e t S:) + ( e d o n A t u p n I k c o l C p e t Se n o r o t o m e h t s e c n a v d a t u p n i d e t a l o s i s i h t n o e g d e g n i o g e v i t i s o p A
. 1 h c t i w S f o s t u p n I t c e l e S p e t s o r c i M e h t n o t n e d n e p e d s i t n e m e r c n i e h t f o e z i s e h T . t n e m e r c n i
2 2
2 22)- ( e d o h t a C t u p n I k c o l C p e t S)- ( e d o h t a C t u p n I k c o l C p e t S
) - ( e d o h t a C t u p n I k c o l C p e t S) - ( e d o h t a C t u p n I k c o l C p e t S)- ( e d o h t a C t u p n I k c o l C p e t S
3 3
3 33: ) + ( e d o n A n o i t c e r i D:) + ( e d o n A n o i t c e r i D
: ) + ( e d o n A n o i t c e r i D: ) + ( e d o n A n o i t c e r i D:) + ( e d o n A n o i t c e r i Dn o i t c e r i d l a c i s y h P . r o t o m e h t f o n o i t c e r i d e h t e g n a h c o t d e s u s i t u p n i d e t a l o s i s i h T
. s g n i d n i w r o t o m e h t f o n o i t c e n n o c e h t n o s d n e p e d o s l a
4 4
4 44)- ( e d o h t a C n o i t c e r i D)- ( e d o h t a C n o i t c e r i D
) - ( e d o h t a C n o i t c e r i D) - ( e d o h t a C n o i t c e r i D)- ( e d o h t a C n o i t c e r i D
5 5
5 55: ) + ( e d o n A F F O / N O:) + ( e d o n A F F O / N O
: ) + ( e d o n A F F O / N O: ) + ( e d o n A F F O / N O:) + ( e d o n A F F O / N O. r e v i r d e h t f o n o i t c e s t u p t u o e h t e l b a s i d d n a e l b a n e o t d e s u s i t u p n i d e t a l o s i s i h T
. k c o l c p e t s e h t t i b i h n i t o n s e o d t u p n i s i h t , r e v e w o H . d e l b a n e e r a s t u p t u o e h t ) n e p o ( H G I H n e h W
6 6
6 66)- ( e d o h t a C F F O / N O)- ( e d o h t a C F F O / N O
) - ( e d o h t a C F F O / N O) - ( e d o h t a C F F O / N O)- ( e d o h t a C F F O / N O
TB1: 6 Pin Input Terminal Description TB1: 6 Pin Input Terminal DescriptionTB1: 6 Pin Input Terminal Description TB1: 6 Pin Input Terminal Description
TB1: 6 Pin Input Terminal Description
Table 2: Pin descriptions for input terminal block connector (TB1)
TB2: 5 Pin Motor Terminal Description TB2: 5 Pin Motor Terminal DescriptionTB2: 5 Pin Motor Terminal Description TB2: 5 Pin Motor Terminal Description
TB2: 5 Pin Motor Terminal Description
Table 3: Pin descriptions for motor terminal block connector (TB2)
# n i Pn o i t p i r c s e D
1:A e s a h Pro t o M p e t S e h t f o 1 e s a h P
2:A e s a h Pro t o M p e t S e h t f o 3 e s a h P
3:B e s a h Pro t o M p e t S e h t f o 2 e s a h P
4:B e s a h Pro t o M p e t S e h t f o 4 e s a h P
5dn u o r G r o t o M
Power Supply Requirements Power Supply RequirementsPower Supply Requirements Power Supply Requirements
Power Supply Requirements
The MLP08641 has an input line voltage ranging from 20-132VAC. QD2 is used as the hot terminal and is
internally fused, QD1 is used as the neutral terminal and QD3 is the ground terminal. These connections
are located on the front face of the driver.  A DC input of 30-185 volts can also be used to power the drive.
To connect the DC to the drive, place the positive voltage wire on QD1 and place the ground wire on the
QD2. It is necessary to use fully insulated crimp terminals on these connectors. 
						

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Absolute Maximum Ratings Absolute Maximum RatingsAbsolute Maximum Ratings Absolute Maximum Ratings
Absolute Maximum Ratings
Input Voltage: 132 VAC or 185 VDC
Output Current: 8.13 AMPS PEAK
Max Plate Temperature: 70° C
Storage Temperature: 0° to +50° C
Input Voltage (For isolated inputs):  +24V at 7mA
Electrical Specifications Electrical SpecificationsElectrical Specifications Electrical Specifications
Electrical Specifications
m e t Ime t I
m e t Im e t Ime t In i Mni M
n i Mn i Mni Mp y Tpy T
p y Tp y Tpy Tx a Mxa M
x a Mx a Mxa Ms t i n Ust i n U
s t i n Us t i n Ust i n U
) r e w o P ( e g a t l o V t u p n I)r e w o P ( e g a t l o V t u p n I
) r e w o P ( e g a t l o V t u p n I) r e w o P ( e g a t l o V t u p n I)r e w o P ( e g a t l o V t u p n I0251 123 1CA V
) r e w o P ( e g a t l o V t u p n I)r e w o P ( e g a t l o V t u p n I
) r e w o P ( e g a t l o V t u p n I) r e w o P ( e g a t l o V t u p n I)r e w o P ( e g a t l o V t u p n I0306 158 1CD V
t n e r r u C t u p t u O e s a h Ptn e r r u C t u p t u O e s a h P
t n e r r u C t u p t u O e s a h Pt n e r r u C t u p t u O e s a h Ptn e r r u C t u p t u O e s a h P0. 157 . 5)S M R ( A
t n e r r u C t u p t u O e s a h Ptn e r r u C t u p t u O e s a h P
t n e r r u C t u p t u O e s a h Pt n e r r u C t u p t u O e s a h Ptn e r r u C t u p t u O e s a h P5. 131 . 8)K A E P ( A
) s t u p n I ( e g a t l o V t u p n I)s t u p n I ( e g a t l o V t u p n I
) s t u p n I ( e g a t l o V t u p n I) s t u p n I ( e g a t l o V t u p n I)s t u p n I ( e g a t l o V t u p n I5. 342CD V
y c n e u q e r F k c o l Cyc n e u q e r F k c o l C
y c n e u q e r F k c o l Cy c n e u q e r F k c o l Cyc n e u q e r F k c o l C000 4zH k
y c n e u q e r F g n i p p o h Cyc n e u q e r F g n i p p o h C
y c n e u q e r F g n i p p o h Cy c n e u q e r F g n i p p o h Cyc n e u q e r F g n i p p o h C740535zH k
e r u t a r e p m e T n o i t a r e p Oer u t a r e p m e T n o i t a r e p O
e r u t a r e p m e T n o i t a r e p Oe r u t a r e p m e T n o i t a r e p Oer u t a r e p m e T n o i t a r e p O007C
Table 4: MLP08641 electrical specifications
Power Connector Requirements Power Connector RequirementsPower Connector Requirements Power Connector Requirements
Power Connector Requirements
It is necessary that fully insulated female quick connect connectors be used for QD1, QD2 and QD3.
Panduit # DNF18-250FIB - Nylon fully insulated, funnel entry with insulation support and internal
        wire stop. Wire range of #22-18 and a tab size of .250 x .032 in.
Panduit # DNF14-250FIB - Nylon fully insulated, funnel entry with insulation support and internal
        wire stop. Wire range of #16-14 and a tab size of .250 x .032 in.
Panduit # DNF10-250FIB - Nylon fully insulated, funnel entry with insulation support and internal
        wire stop. Wire range of #12-10 and a tab size of .250 x .032 in. 
						

							#L010150February 2004
Hook Up Drawings Hook Up DrawingsHook Up Drawings Hook Up Drawings
Hook Up Drawings
Figure 1: Hook up for current sinking inputs
Figure 2: Hook up for current sourcing inputs 
						

							#L010150February 2004
Motor Selection Motor SelectionMotor Selection Motor Selection
Motor Selection
The MLP08641 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 MLP08641 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 MLP08641 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 MLP08641.
Step Motor Current Setting Guide Step Motor Current Setting GuideStep Motor Current Setting Guide Step Motor Current Setting Guide
Step Motor Current Setting Guide
Anaheim Automation offers motor cable, making hook-ups quick and easy! Anaheim Automation offers motor cable, making hook-ups quick and easy!Anaheim Automation offers motor cable, making hook-ups quick and easy! Anaheim Automation offers motor cable, making hook-ups quick and easy!
Anaheim Automation offers motor cable, making hook-ups quick and easy!
Contact the factory or visit our website for more motor and cable offerings. Contact the factory or visit our website for more motor and cable offerings.Contact the factory or visit our website for more motor and cable offerings. Contact the factory or visit our website for more motor and cable offerings.
Contact the factory or visit our website for more motor and cable offerings.
e l p m a x E r o t o Mel p m a x E r o t o M
e l p m a x E r o t o Me l p m a x E r o t o Mel p m a x E r o t o Mt n e r r u C r o t o Mtn e r r u C r o t o M
t n e r r u C r o t o Mt n e r r u C r o t o Mtn e r r u C r o t o M
e d o C r e b m u Ned o C r e b m u N
e d o C r e b m u Ne d o C r e b m u Ned o C r e b m u Nr a l o p i n Ura l o p i n U
r a l o p i n Ur a l o p i n Ura l o p i n U
g n i t a Rgn i t a R
g n i t a Rg n i t a Rgn i t a Rk a e P s e i r e Ska e P s e i r e S
k a e P s e i r e Sk a e P s e i r e Ska e P s e i r e S
g n i t a Rgn i t a R
g n i t a Rg n i t a Rgn i t a Rk a e P l e l l a r a Pka e P l e l l a r a P
k a e P l e l l a r a Pk a e P l e l l a r a Pka e P l e l l a r a P
g n i t a Rgn i t a R
g n i t a Rg n i t a Rgn i t a Rs e i r e Sse i r e S
s e i r e Ss e i r e Sse i r e S
t n e r r u Ctn e r r u C
t n e r r u Ct n e r r u Ctn e r r u C
g n i t t e Sgn i t t e S
g n i t t e Sg n i t t e Sgn i t t e Sl e l l a r a Ple l l a r a P
l e l l a r a Pl e l l a r a Ple l l a r a P
t n e r r u Ctn e r r u C
t n e r r u Ct n e r r u Ctn e r r u C
g n i t t e Sgn i t t e S
g n i t t e Sg n i t t e Sgn i t t e S
1 D 3 21D 3 2
1 D 3 21 D 3 21D 3 2202 0
2 02 020SS
S SS2 02 0
2 02 020
A 0 . 1A0 . 1A0 . 2-- - -%5 1
3 L 3 23L 3 2
3 L 3 23 L 3 23L 3 2303 0
3 03 0308W L - D8W L - D
8 W L - D8 W L - D8W L - D3 03 0
3 03 030
A 5 . 1A5 . 1A0 . 3%0%3 3
1 N 4 31N 4 3
1 N 4 31 N 4 31N 4 3404 0
4 04 0408W L - S8W L - S
8 W L - S8 W L - S8W L - S4 04 0
4 04 040
A 0 . 2A0 . 2A0 . 4%5 1%5 4
0 4 L 3 204 L 3 2
0 4 L 3 20 4 L 3 204 L 3 2505 0
5 05 0508W L - D8W L - D
8 W L - D8 W L - D8W L - D5 05 0
5 05 050
A 5 . 2A5 . 2A0 . 5%5 2%8 5
1 A 4 31A 4 3
1 A 4 31 A 4 31A 4 3606 0
6 06 060BB
B BB6 06 0
6 06 060
A 0 . 3A0 . 3A0 . 6%3 3%0 7
2 N 4 32N 4 3
2 N 4 32 N 4 32N 4 3707 0
7 07 0708W L - S8W L - S
8 W L - S8 W L - S8W L - S7 07 0
7 07 070
A 5 . 3A5 . 3A0 . 7%8 3%3 8
1 K 4 31K 4 3
1 K 4 31 K 4 31K 4 3808 0
8 08 0808W L - S8W L - S
8 W L - S8 W L - S8W L - S8 08 0
8 08 080
A 0 . 4A0 . 4A0 . 8%5 4%8 9
2 N 2 42N 2 4
2 N 2 42 N 2 42N 2 4909 0
9 09 090BC - SBC - S
B C - SB C - SBC - S9 09 0
9 09 090
A 5 . 4A5 . 4A0 . 9%2 5%0 0 1
3 L 3 23L 3 2
3 L 3 23 L 3 23L 3 2010 1
0 10 1018W L - S8W L - S
8 W L - S8 W L - S8W L - S0 10 1
0 10 101
A 0 . 5A0 . 5A0 . 0 1%8 5%0 0 1
3 D 4 33D 4 3
3 D 4 33 D 4 33D 4 3111 1
1 11 111DD
D DD1 11 1
1 11 111
A 5 . 5A5 . 5A0 . 1 1%3 6%0 0 1
1 K 2 41K 2 4
1 K 2 41 K 2 41K 2 4212 1
2 12 121BC - SBC - S
B C - SB C - SBC - S2 12 1
2 12 121
A 0 . 6A0 . 6A0 . 2 1%0 7%0 0 1
2 D 4 32D 4 3
2 D 4 32 D 4 32D 4 3313 1
3 13 131SS
S SS3 13 1
3 13 131
A 5 . 6A5 . 6A0 . 3 1%7 7%0 0 1
3 N 4 33N 4 3
3 N 4 33 N 4 33N 4 3414 1
4 14 1418W L - S8W L - S
8 W L - S8 W L - S8W L - S4 14 1
4 14 141
A 0 . 7A0 . 7A0 . 4 1%3 8%0 0 1
1 N 2 41N 2 4
1 N 2 41 N 2 41N 2 4515 1
5 15 151BC - DBC - D
B C - DB C - DBC - D5 15 1
5 15 151
A 5 . 7A5 . 7A0 . 5 1%8 8-- - -
4 K 4 34K 4 3
4 K 4 34 K 4 34K 4 3616 1
6 16 1618W L - S8W L - S
8 W L - S8 W L - S8W L - S6 16 1
6 16 161
A 0 . 8A0 . 8A0 . 6 1%8 9-- - -
1 D 2 41D 2 4
1 D 2 41 D 2 41D 2 4919 1
9 19 191DD
D DD9 19 1
9 19 191
A 5 . 9A5 . 9A0 . 9 1%0 0 1-- - -
3 N 2 43N 2 4
3 N 2 43 N 2 43N 2 4222 2
2 22 222BC - SBC - S
B C - SB C - SBC - S2 22 2
2 22 222
A 0 . 1 1A0 . 1 1A0 . 2 2%0 0 1-- - -
2 D 2 42D 2 4
2 D 2 42 D 2 42D 2 4525 2
5 25 252SS
S SS5 25 2
5 25 252
A 5 . 2 1A5 . 2 1A0 . 5 2%0 0 1-- - -
Table 5: Table selection for Anaheim Automation motor current settings 
						

							#L010150February 2004
Microstep Selection (SW1 Settings) Microstep Selection (SW1 Settings)Microstep Selection (SW1 Settings) Microstep Selection (SW1 Settings)
Microstep Selection (SW1 Settings)
Switches 2, 3 and 4, of the DIP switch 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 wave-
forms are sinusoidal. The steps/rev are based on a 200 step/rev motor.
Setting the Output Current Setting the Output CurrentSetting the Output Current Setting the Output Current
Setting the Output Current
The output current on the MLP08641 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:
t n e r r u C k a e Ptn e r r u C k a e P
t n e r r u C k a e Pt n e r r u C k a e Ptn e r r u C k a e Pg n i t t e S r e t e m o i t n e t o Pgn i t t e S r e t e m o i t n e t o P
g n i t t e S r e t e m o i t n e t o Pg n i t t e S r e t e m o i t n e t o Pgn i t t e S r e t e m o i t n e t o Pt n e r r u C k a e Ptn e r r u C k a e P
t n e r r u C k a e Pt n e r r u C k a e Ptn e r r u C k a e Pg n i t t e S r e t e m o i t n e t o Pgn i t t e S r e t e m o i t n e t o P
g n i t t e S r e t e m o i t n e t o Pg n i t t e S r e t e m o i t n e t o Pgn i t t e S r e t e m o i t n e t o P
A 0 5 . 1%0A 5 2 . 5%0 6
A 5 7 . 1%0 1A 0 0 . 6%0 7
A 8 3 . 2%0 2A 7 8 . 6%0 8
A 4 9 . 2%0 3* * A 3 6 . 7%0 9
A 9 6 . 3%0 4* * A 3 1 . 8%0 0 1
A 4 4 . 4%0 5- - - --- - -
Table 7:  Potentiometer values with respect to the output currentRefer to Table 5 for specific motor current settings. Refer to Table 5 for specific motor current settings.Refer to Table 5 for specific motor current settings. Refer to Table 5 for specific motor current settings.
Refer to Table 5 for specific motor current settings.
n o i t u l o s e Rv e R / s p e t S1 t c e l e S2 t c e l e S3 t c e l e S4 t c e l e St n e r r u C e c u d e R o t u A
1
0 0 2FF ONONONOde l b a s i D
2
0 0 4FF ONONOFF Ode l b a s i D
5
0 0 0 1FF ONOFF ONOde l b a s i D
8
0 0 6 1FF ONOFF OFF Ode l b a s i D
0 1
0 0 0 2FF OFF ONONOde l b a s i D
6 1
0 0 2 3FF OFF ONOFF Ode l b a s i D
2 3
0 0 4 6FF OFF OFF ONOde l b a s i D
4 6
0 0 8 2 1FF OFF OFF OFF Ode l b a s i D
1
0 0 2NONONONOde l b a n E
2
0 0 4NONONOFF Ode l b a n E
5
0 0 0 1NONOFF ONOde l b a n E
8
0 0 6 1NONOFF OFF Ode l b a n E
0 1
0 0 0 2NOFF ONONOde l b a n E
6 1
0 0 2 3NOFF ONOFF Ode l b a n E
2 3
0 0 4 6NOFF OFF ONOde l b a n E
4 6
0 0 8 2 1NOFF OFF OFF Ode l b a n E
Table 6: Microstep selection on switch 1
** Although the MLP08641 has an internal fan, current settings above 7.0Amps (83%) may require
additional cooling. 
						

							#L010150February 2004
When configuring the motor in a series configuration series configurationseries configuration series configuration
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 Output CurrentReducing Output Current Reducing Output Current
Reducing Output Current
Reducing the output current is accomplished by setting switch 1 of the DIP switch to the ON position 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 approximately 70% of the set current. When the current
reduction circuit is activated, the current reduction resistor is paralleled with the current adjustment poten-
tiometer. This lowers the total resistance value, and thus lowers the per Phase output current.
Determining Output Current Determining Output CurrentDetermining Output Current Determining Output 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 MLP08641, 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 MLP08641.
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 Motor ConfigurationsStep Motor Configurations Step Motor Configurations
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! WARNING!WARNING! WARNING!
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 6 Lead Motors6 Lead Motors 6 Lead Motors
6 Lead Motors
When configuring a 6 lead motor in a half-coil configuration half-coil configurationhalf-coil configuration half-coil configuration
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 4 Lead Motors4 Lead Motors 4 Lead Motors
4 Lead Motors
Multiply the specified series  series series  series 
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 8 Lead Motors8 Lead Motors 8 Lead Motors
8 Lead Motors
Series Connection: Series Connection:Series Connection: Series Connection:
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: Parallel Connection:Parallel Connection: Parallel Connection:
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: NOTE:NOTE: NOTE:
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. 
						

							#L010150February 2004
Dimension Drawing Dimension DrawingDimension Drawing Dimension Drawing
Dimension Drawing
Figure 5: MLP08641 dimensions
Connecting the Step Motor Connecting the Step MotorConnecting the Step Motor Connecting the Step Motor
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 NOTENOTE NOTE
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: WARNING:WARNING: WARNING:
WARNING: Do not connect or disconnect motor wires while power is applied!
Short-Circuit, Mis-Wire, and Over-Current Conditions Short-Circuit, Mis-Wire, and Over-Current ConditionsShort-Circuit, Mis-Wire, and Over-Current Conditions Short-Circuit, Mis-Wire, and Over-Current Conditions
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 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 and Over-Voltage Conditions Over-Temperature and Over-Voltage ConditionsOver-Temperature and Over-Voltage Conditions Over-Temperature and Over-Voltage Conditions
Over-Temperature and Over-Voltage Conditions
If it is found that there is an over temperature on the internal heat sink, or an over voltage on the motor bus
voltage,  the Red LED will blink and power will be shut off to the motor.  To reset the drive turn power off,
check wiring, and turn power back on.