Stepper DriveS
75.5
HigH performance Step
anD Direction DriveS
STR Series
l Sophisticated Current Control;
STR2: 2A/phase
STR4: 4A/phase
STR8: 8A/phase
l Anti-Resonance for Optimized
Torque and Smoothness Over a
Wide Speed Range
l Microstep Emulation for Creating
Smooth Motion Even with
Low-Resolution Step Signals
l Up to 20,000 Steps/Revolution
l Step and Direction or CW/CCW
Pulse Operation
l Built-In Noise Filter on STEP
and DIR Inputs
l Large Family of Compatible
2-Phase Stepper Motors
The STR series stepper drive is a compact,
powerful, digital step and direction drive
available in three power ranges: 2 A/phase,
4 A/phase and 8 A/phase. The STR series is
ideal for applications requiring basic step and
direction control of a 2-phase step motor.
All setup is done via dip switches and a rotary
switch on the side of the drive, including
motor selection, running current, idle current,
and step resolution.
STR drives are available with a large family of
compatible 2-phase step motors, selected to
optimize performance of both the drive
and motor.
Dimensions mm (inch)
112
4 x Dia
(0.137)
3.5
(2.97)
22.5
(0.887)
25.3
(0.996)
33
(1.30)
8.9
(0.35)
STR4 shown actual size.
2 x Slot
4.3
(0.17)
22.5
(0.89)
3.2
(0.125)
(4.65)
118
D-1
OMHT Series, visit omega.com/omht_series
for details. All models shown smaller than actual size.
Order Power
Supplies
Separately. See
omega.com
for details
RECOMMENDED MOTORS
MODEL NO. DESCRIPTION
RECOMMENDED MOTORS FOR STR2
OMHT11-013 NEMA 11 stepper motor, 15 oz-in holding torque, 1.0 A/phase
OM5014-842 NEMA 14 stepper motor, 26 oz-in holding torque, 1.0 A/phase
OMHT17-075 NEMA 17 stepper motor, 62.8 oz-in holding torque, 1.7 A/phase, parallel connection
OMHT17-275 NEMA 17 stepper motor, 62.8 oz-in holding torque, 1.7 A/phase, parallel connection
RECOMMENDED MOTORS FOR STR4/STR8
OMHT17-075 NEMA 17 stepper motor, 62.8 oz-in holding torque, 1.7 A/phase, parallel connection
OMHT17-275 NEMA 17 stepper motor, 62.8 oz-in holding torque, 1.7 A/phase, parallel connection
OMHT24-100 NEMA 24 stepper motor, 123 oz-in holding torque, 2.8 A/phase
OMHT24-105 NEMA 24 stepper motor, 177 oz-in holding torque, 4.0 A/phase
OMHT24-108 NEMA 24 stepper motor, 354 oz-in holding torque, 4.0 A/phase
OMHT34-485 NEMA 34 stepper motor, 650 oz-in holding torque, 4.3 A/phase, series connection
OMHT34-486 NEMA 34 stepper motor, 1200 oz-in holding torque, 4.1 A/phase, series connection
OMHT34-504 NEMA 34 stepper motor, 396 oz-in holding torque, 3.18 A/phase, series connection
OMHT34-505 NEMA 34 stepper motor, 849 oz-in holding torque, 3.18 A/phase, series connection
RECOMMENDED MOTORS FOR STR8
OMHT34-485 NEMA 34 stepper motor, 650 oz-in holding torque, 8.6 A/phase, parallel connection
OMHT34-486 NEMA 34 stepper motor, 1200 oz-in holding torque, 8.1 A/phase, parallel connection
OMHT34-487 NEMA 34 stepper motor, 1845 oz-in holding torque, 9.01 A/phase, parallel connection
OMHT34-504 NEMA 34 stepper motor, 396 oz-in holding torque, 6.3 A/phase, parallel connection
OMHT34-505 NEMA 34 stepper motor, 849 oz-in holding torque, 6.3 A/phase, parallel connection
OMHT34-506 NEMA 34 stepper motor, 1260 oz-in holding torque, 5.6 A/phase, parallel connection
Note: Ratings are with motor connected in parallel.
D-2
0
50
100
150
200
250
300
350
0510 15 20 25 30 35 40
oz-in
rps
HT24 with STR8
Connection: Parallel
24v Power Supply , 20,000 steps/rev
HT24-100 HT24-105 HT24-108
torque-SpeeD curveS
HT17 with STR4
Connection: Parallel
24v Power Supply , 20,000 steps/rev
60
50
40
30
oz-in
20
10
0
0510 15 20 25 30 35 40
HT17-068 HT17-071 HT17-075
rps
HT17 with STR4
Connection: Parallel
48v Power Supply , 20,000 steps/rev
60
50
40
30
oz-in
20
10
0
0510 15 20 25 30 35 40
HT17-068 HT17-071 HT17-075
rps
HT24 with STR8
Connection: Parallel
24v Power Supply , 20,000 steps/rev
350
300
250
200
oz-in
150
100
50
0
0510 15 20 25 30 35 40
HT24 with STR8
Connection: Parallel
48v Power Supply , 20,000 steps/rev
350
300
250
200
oz-in
150
100
50
0
0510 15 20 25 30 35 40
HT24-100 HT24-105 HT24-108
rps
HT24-101 HT24-105 HT24-108
rps
HT34 with STR4
Connection: Series
Power Supply 48V, 20,000 steps/rev
900
800
700
600
500
oz-in
400
300
200
100
0
0510 15 20 25 30 35 40
HT34-504 HT34-505 HT34-485 HT34-486
rps
HT34 with STR8
Connection: Parallel
Power Supply 24V, 20,000 steps/rev
1000
900
800
700
600
500
oz-in
400
300
200
100
0
0510 15 20 25 30 35 40
HT34-504 HT34-505 HT34-506
rps
HT34 with STR8
Connection: Parallel
Power Supply 48V, 20,000 steps/rev
1000
900
800
700
600
500
oz-in
400
300
200
100
0
0510 15 20 25 30 35 40
HT34-504 HT34-505 HT34-506
rps
HT34 with STR8
Connection: Parallel
Power Supply 60V, 20,000 steps/rev
1000
900
800
700
600
500
oz-in
400
300
200
100
0
0510 15 20 25 30 35 40
HT34-504 HT34-505 HT34-506
rps
D-3
OMRC-050 Regen Clamp—For Stepper Drive
Power Supply Protection
l Voltage Range 24 to 80 Vdc
l 50 W Power Dissipation
l Regen Present LED
l Power LED
l 76 x 102 x 6.4 mm (3 x 4 x 2.5")
SPECIFICATIONS
Input Power Cont: 50 W
Input Power Peak: 800 W
Voltage Range: 24 to 80 Vdc
Recommended When Using:
NEMA 17 motors @ speeds > 30 rps
NEMA 23 motors @ speeds > 10 rps
NEMA 34 motors @ speeds > 4 rps
Recommended Power Supplies
(Order Separately)
OMPS150A24: 24 Vdc at 6.3 A
OMPS300A48: 48 Vdc at 6.7 A
SPECIFICATIONS
POWER AMPLIFIER SECTION (STR4)
Amplifier Type: Mosfet, dual H-bridge,
4 quadrant
Current Control: 4 state Pwm at 20 Khz
Output Current: Up to 4.5 a/phase,
depending on motor selection
Switch Selectable % of Maximum
Current: 100%, 90%, 80%, 70%
Power Supply: External 24 to 48 Vdc
power supply required
Idle Current Reduction: Reduction to
50% or 90%, switch selectable
POWER AMPLIFIER SECTION (STR8)
Amplifier Type: Mosfet, dual H-bridge,
4 quadrant
Current Control: 4 state Pwm at 20 Khz
Output Current: Up to 8 a/phase,
depending on motor selection
Switch Selectable % of Maximum
Current: 100%, 90%, 80%, 70%
Power Supply: External 24 to 75 Vdc
power supply required
Idle Current Reduction: Reduction to
50% or 90%, switch selectable
CONTROLLER SECTION
Mode Of Operation: Step and direction,
Cw/Ccw
Microstep Resolution: Switch
selectable: 200, 200 smooth, 400,
400 smooth, 2000, 5000, 12800,
20000 steps/revolution
Speed Range: Depends upon selected
resolution amplifier is suitable for
speeds up to 50 Rps
Anti Resonance: Raises the system
damping ratio eliminates midrange
instability and allows stable operation
to 50 Rps
OMRC-050
shown smaller
han actual size.
Order Motors
Separately See
omega.com
for Details
OMPS150A24
shown smaller
than actual size.
Waveform: Allows for fine adjustment
of phase current waveform harmonic
content to reduce low-speed torque
ripple in the range 0.25 to 1.5 Rps
Digital Noise Filter: Step pulse input:
150 Khz or 2 Mhz, jumper selectable
Self Test Switch Selectable: Rotates
motor 2 revolutions in each direction
Control Inputs: Step, direction, enable,
optically isolated; 4 to 30 Vdc,
5 to 15 ma.
Step Input: Min pulse width = 250 Ns;
max pulse frequency = 2 Mhz
Fault Output: Photodarlington, 80 Ma,
30 Vdc max; voltage drop = 1.2 Vdc
max at 80 Ma
Ambient Temperature: 0 to 50°C
(32 to 122°F) humidity 90%
non-condensing
To Order Visit omega.com/str for Pricing and Details
MODEL NO. DESCRIPTION
STR2 Step and direction stepper drive with 2 A output
STR4 Step and direction stepper drive with 4.5 A output
STR8 Step and direction stepper drive with 8 A output
ACCESSORIES
MODEL NO. DESCRIPTION
OMPS150A24 Power supply with active PFC filter, 24 Vdc, 6.3 A
OMPS300A48 Power supply with active PFC filter, 48 Vdc, 6.7 A
OMRC-050 Regeneration clamp, 24 to 80 Vdc
POWER CORD-SE AC power cord with stripped end termination
Ordering Example: STR4, step and direction stepper drive with 4.5 A output and OMPS150A24, 24 Vdc/6.3 A power supply.
D-4
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