Features
– 1 –
Thank you for selecting Danaher Motion as your positioning
equipment supplier. We understand that you can choose from a
number of competitive suppliers, and are pleased that you have
selected DPS.
This manual addresses the MDM-7
™
Drive Module. As you
unpack and begin to use our product, we would like your conclu-
sions as to our products’ appearance, quality, precision, and suit-
ability to your ultimate application. By providing us with feedback
in these and other areas, you can become an active participant in
our on-going program of continuous improvement.
Our Customer Service department can be reached at:
We encourage you to visit our web site at
www.danaherprecision.com
. It includes information on new
products, along with our existing product catalog, a Motion
Control Handbook covering 33 technical topics, and other
useful information.
Thank you again for choosing Danaher Motion. We look forward
to serving you in the future.
Overview
MDM-7
™
Drive Module Operator’s Manual
phone: 603.893.0588 or 800.227.1066 fax: 603.893.8280
e-mail: support@NEAT.com
Danaher Motion
•
Precision Systems Group
•
7C Raymond Avenue, Salem, NH 03079
tel:
603.893.0588
•
toll free:
800.227.1066
•
fax:
603.893.8280
•
url:
www.danaherprecision.com
• Compact 4.5”w x 4.0”h x 0.8”d package
• High speed operation, to 150 revs/second
• Complete mid-range resonance suppression
• Optically isolated inputs
The MDM-7 stepping motor drive module provide compact,
high performance solutions to stepping motor drive require-
ments. The MDM7 divides each full step into 10 microsteps,
providing 2000 steps per revolution from standard 1.8 degree
stepping motors and features high speed bipolar chopper out-
put stages, capable of running stepping motors at speeds in
excess of 150 revolutions per second. Use of efficient MOSFET
output devices results in minimal drive heating; in many cases,
no additional heat sinking is required.
The MDM-7 module features full compensation for mid-range
resonance. Most available stepping motor drives (especially
microsteppers) overlook this problem, which accounts for many
application-killing “stalling” or “resonance” complaints. The
microstepping MDM-7 module provides a factor of 10 increase
in system resolution overfull stepdrives, with no trade-off in
high speed performance. It also provides exceptionally smooth
low speed motion, nearly eliminating noise and vibration in the
0 to 2 rev/sec speed range. Due to the efficient recirculating
design of these drive modules, overall power supply require-
ments are reduced to only 1/3 of the motors rated phase cur-
rent full coil) or 2/3 of the rated value (half coil).
The MDM-7 module operates from unregulated supply voltages
between 24 and 60 volts D.C., and can drive motors rated at up
to 3.5 Amps per phase (half coil) or 7.0 Amps per phase (full
coil). Use of this module at high shaft speeds will require com-
mensurately high step pulse rates (200 KHz for 100 rev/sec.);
ideal companion indexer boards for the IBM-PC are our PCX
cards, which generate step rates of up to 524kHz. Motor cur-
rent is adjustable via an external 1/4 watt resistor; resistor val-
ues for a wide range of current settings, as well as all neces-
sary wiring details, are screened onto each module. If desired,
idle current reduction can be easily implemented with external
logic. Opto-isolators on the TTL compatable input lines provide
effective isolation from noise-sensitive logic or CPU-based
controllers. All wiring terminations are made via convenient
screw-clamp terminal strips. Housed in compact, rugged metal
enclosures 4.5” wide x 4.0” high x 0.8” deep, these drive mod-
ules mount easily to any flat surface.
Connector Details . . . . . . . . . . . . . . . . . . . . . . . 2
Full Coil versus Half Coil. . . . . . . . . . . . . . . . . . 3
Microstepping . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Midrange Resonance . . . . . . . . . . . . . . . . . . . . 8
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Warranty & Terms . . . . . . . . . . . . . . . . . . . . . . 10
Contents
