STEPPER
DRIVES
88
Features
Description
3540MO Step Motor Drive with Digital Oscillator
Microstepping
3.5 amps, 40 VDC
• DC bus voltage 12-42 VDC motor supply (includ-
• Switch selectable currents from 0.4–3.5 amps/
• Microstepping at 12,800 steps/rev
• Switch selectable idle current reduction, 0 or 50%
• Optically isolated 5–12 VDC inputs
• Internal Pot, accel/decel (1–250 rev/sec/sec, Low
• External Speed, Pot or Joystick 3 terminal type,
• 140 watts of usable power
• Screw terminal connectors
• MOSFET, dual H-bridge, inaudible PWM amplifier
• 3 state, pulse width modulated current control,
• Drives 4, 6 or 8 lead size 11, 14, 17, 23 or 34 step
• CE compliant
The 3540MO step motor driver is a microstepping
drive at 12,800 steps per revolution, step phase se-
quencer with MOSFET three state switching ampli-
fiers and optoisolated circuits. This drive includes 5
optically isolated inputs, external speed control,
tach output, and internal pots for accel/decel rate
along with high/low speed range selection.
The amplifier regulates motor current by chopping at
a constant, inaudible frequency. Phase current is se-
lected from 32 levels by a DIP switch. Microstepping
resolution is also selected by DIP switch.
ing ripple)
phase motor current
• Run, directs drive to run or stop
• Direction, sets direction of rotation
• Speed, selects high speed (25rps) or low
• Enable, removes all motor current when active
• Wiper, 0–5V analog for external speed signal,
• Output, Tach: 5–24V optically isolated, 100
speed (0–5 rps), High speed (0–25 rps)
1k–10k ohms
switching at 20–30 KHz
motors
speed (5rps) range
pot or joystick
pulses per revolution
MECHANICAL OUTLINE
BLOCK DIAGRAM
common
run
hi/lo speed
direction
enable
tach out+
tach out-
Recommended motors for the 3540MO drive:
Size 11
———— ———— ———— ————
HT11-012 5014-842
HT11-013
Size 34
————
5034-348
0.125"
ext
speed
12-42 VDC
3.75"
831/761-6555 • 800/525-1609 • FAX 831/761-6544
Joystick Interface
Digital Oscillator
speed
HI
Isolation
Optical
speed
&
Size 14
LO
2.50"
404 Westridge Dr. • Watsonville, CA 95076
3.00"
accel
www.appliedmotionproducts.com
Sequencer
Microstep
Size 17
HT17-068 HT23-394
HT17-071 HT23-397
HT17-075 HT23-400
ext speed
joystick
4.00"
0.25"
4 x Ø.125
2x Ø.125
50% idle
0.25"
Amplifier
MOSFET
Size 23
.875"
1.50"
0.4 to 3.5
A/phase
current
A+
A–
B+
B–
to
motor
3.70"
0.15"