Isel MD24 User manual

isel®Germany AG D-36124 Eichenzell Bürgermeister-Ebert-Str. 40 +49/(0)6659/981-700 +49/(0)6659/981-776
Item-no. 970317 BE001
Last update: 01/2010
MD24 / MD28
Microstepping Driver
odul
Instruction Manual
Hardware Description

The information, technical data and dimensions contained in this manual
correspond to the best available technology at the time of publication.
Nevertheless existing misprints and errors cannot be excluded. We are always
grateful for improvement suggestions and error hints.
We point out to the fact that software and hardware names of the respective
companies that are used in our prints are generally subject to trademark or brand
or patent protection.
All rights reserved. No part of our prints may either be reproduced in any form
(print, photography or another procedure) or processed, copied or published by
using electronic systems without written permission of isel®.
Manufacturer: isel®Germany AG
Buergermeister-Ebert-Straße 40
D-36124 Eichenzell
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Web: http://www.isel.com

1
Table of Content
1Introduction ......................................................................................................... 1
2Safety Instructions.............................................................................................. 2
3Technische Daten................................................................................................ 3
4Dimensions.......................................................................................................... 3
5Pin Assignment................................................................................................... 4
5.1 P1 - Control-Signals.................................................................................... 4
5.2 P2 - Motor / Power-supply........................................................................... 4
6Jumpers ............................................................................................................... 5
7Control Signal Connector (P1) Interface ........................................................... 6
8Connecting the Motor (P2) ................................................................................. 7
8.1 Connections to 4-lead Motors ...................................................................... 7
8.2 Connections to 6-lead Motors ...................................................................... 7
8.2.1 Half Coil Configurations 7
8.2.2 Full Coil Configurations 8
8.3 Connections to 8-lead Motors ...................................................................... 8
8.3.1 Series Connections 8
8.3.2 Parallel Connections 9
9Power Supply Selection...................................................................................... 9
9.1 Regulated or Unregulated Power Supply..................................................... 9
9.2 Multiple Drivers........................................................................................... 10
10 Selecting Microstep Resolution and Driver Output Current.......................... 10
10.1 Microstep Resolution Selection.................................................................. 10
10.1.1 MD24 10
10.1.2 MD28 11
10.2 Current Settings ......................................................................................... 11
10.2.1 MD24 11
10.2.2 MD28 12
10.3 Standstill Current Setting............................................................................ 12
11 Wiring Notes...................................................................................................... 12
12 Typical Connection........................................................................................... 13

2
13 Sequence Chart of Control Signals................................................................. 13
14 Protection Functions ........................................................................................ 14
15 Problem Symptoms and Possible Causes...................................................... 15

MD24 / MD28 –Hardware Description
1
1 Introduction
The MD24 / MD28 are economical microstepping driver based on patented technology. It
is suitable for driving 2-phase and 4-phase hybrid stepping motors. By using the
advanced bipolar-current chopping technique, it can output more speed and torque from
the same motor, compared with traditional drivers, such as L/R drivers. Its 3-state current
control technology allows coil currents to be well controlled and with relatively small
current ripple, therefore less motor heating is achieved.
Features:
- Low cost and good high-speed torque
- Optically isolated input signals
- Pulse frequency up to 300 KHz
- Automatic idle-current reduction
- 3-state current control technology
- High resolution Microstepping
- Suitable for 2-phase and 4-phas motors
- DIP-Switch setting
- Over-voltage and short-circuit protection
Small size
Suitable for a wide range of stepping motors from Nema size 17 to 34. It can be used in
various kinds of machines, such as X-Y tables, labeling machines, laser cutters, engraving
machines, pick-place devices, and so on. Particularly adapt to the applications desired with
low vibration, high speed and high precision.

MD24 / MD28 –Hardware Description
2
2 Safety Instructions
The MD24 / MD28 modules are designed according to the current state of the art
and the accepted safety-relevant rules.
The devices may only be actuated in perfect technical condition. Failures are to be
eliminated immediately. Children and persons that are not instructed may not put the
device into operation.
The equipment may only be used for the intended purpose.
All work is to be accomplished exclusively by authorized technical personnel and
with consideration of the regulations of the electrical industry as well as the rules for
the prevention of accidents.
Assembly and employment of the equipment is to be accomplished according to the
standards of the declaration of conformity. The regulations and limit values kept by
the manufacturer do not protect in case of inappropriate use of the equipment.
The equipment may not be exposed to high air humidity and high vibrations
(see technical data).
Keep this operating instructions in a safe place and commit each user
to its observance!
Non-observance of this instruction manual can result in damages to property,
heavy bodily injuries and death.

MD24 / MD28 –Hardware Description
3
3 Technische Daten
MD 24
MD 28
Min.
Typ.
Max.
Min.
Typ.
Max.
Output current [A]
1
-
4,2
2,8
-
7,8
Supply voltage [V]
20
36
50
24
68
80
Logic signal current [mA]
7
10
16
7
10
16
Pulse input frequency [KHz]
0
-
300
0
-
300
Isolation resistance [MΩ]
500
-
-
500
-
-
Cooling
Natural Cooling or Forced cooling
Environment
Avoid dust, oil fog and corrosive gases
Ambient Temperature
0°C –50°C
Humidity
40% RH –90% RH
Operating Temperature
Max. 70°C
Vibration
Max. 5,9m/s2
Storage Temperature
-20°C - 65°C
Weight
Ca. 280 Gramm
Ca. 440 Gramm
Dimensions
118 x 75,5 x 33mm
119 x 97 x 48mm
4 Dimensions
MD24 MD28
Draufsicht Seitenansicht
(All units:mm)

MD24 / MD28 –Hardware Description
4
5 Pin Assignment
5.1 P1 - Control-Signals
Phoenix 6-pin.
Pin
Signal
Description
1
PUL+(+5V)
Pulse signal: In single pulse (pulse/direction) mode, this input represents
pulse signal, effective for each rising or falling edge (set by inside jumper
J1); 4-5V when PUL-HIGH, 0-0.5V when PUL-LOW. In double pulse mode
(pulse/pulse) , this input represents clockwise (CW) pulse, effective for high
level or low level (set by inside jumper J1). For reliable response, pulse
width should be longer than 1.5µs. Series connect resistors for
current-limiting when +12V or +24V used.
2
PUL-(PUL)
3
DIR+(+5V)
DIR signal: In single-pulse mode, this signal has low/high voltage levels,
representing two directions of motor rotation; in double-pulse mode (set by
inside jumper J2), this signal is counter-clock (CCW) pulse, effective for
high level or low level (set by inside jumper J1). For reliable motion
response, DIR signal should be ahead of PUL signal by 5µs at least. 4-5V
when DIR-HIGH, 0-0.5V when DIR-LOW.
4
DIR-(DIR)
5
ENA+(+5V)
Enable signal: This signal is used for enabling/disabling the driver. High
level (NPN control signal, PNP and Differential control signals are on the
contrary, namely Low level for enabling.) for enabling the driver and low
level for disabling the driver.
Usually left UNCONNECTED (ENABLED)
6
ENA-(ENA)
5.2 P2 - Motor / Power-supply
Phoenix 6-pin.
Pin
Signal
Description
1
GND
DC power ground
2
+V
DC power supply (see techn. data)
3
A+
Motor-Phase A
4
A-
5
B+
Motor-Phase B
6
B-

MD24 / MD28 –Hardware Description
5
6 Jumpers
There are two jumpers J1 and J2 inside the MD24 / MD28 specifically for the purpose of
selecting effective pulse edge or effective level and control signal mode, as shown in
figure 2. Default setting is PUL/DIR mode and upward-rising edge effective.
PUL/DIR mode and effective at upward-rising edge PUL/DIR mode and effective at downward-falling edge
CW/CCW mode and effective CW/CCW mode and effective
at high level (The fixed level) at low level (The fixed level)

MD24 / MD28 –Hardware Description
6
7 Control Signal Connector (P1) Interface
The MD24 / MD28 can accept differential and single-ended inputs (including open-collector and
PNP output). The MD24 / MD28 has 3 optically isolated logic inputs which are located on
connector P1 to accept line driver control signals. These inputs are isolated to minimize or
eliminate electrical noises coupled onto the drive control signals. Recommend use line driver
control signals to increase noise immunity of the driver in interference environments. In the
following figures, connections to open-collector and PNP signals are illustrated.
a) Common-anode
b) Common-cathode