Mclennan Servo Supplies Ltd. Tel: +44 (0)8707 700 700 www.mclennan.co.uk

Issue 002

LED 1

Green

Power in on

LED 2

Yellow

Output is disabled

LED 3

Red

Over-temperature fault detected

LED 4

Red

Overload fault detected

LED 5

Yellow

Home phase output

3.5 Amp Bi-polar stepper motor drive

MSE570 Evo 2

The MSE570 is a low cost high performance Eurocard Bi-polar drive

designed for mounting in 3U high Euro-racks. Ideally suited for use

with Nema size 17, 23 & 34 stepper motors, the unit provides a wide

range of current options. Designed for use by original equipment

manufacturers, the unit provides a reliable and economic in-service

proven’ drive solution. Furthermore, the MSE570 design enables

users to customise the unit to meet their exact requirements by

providing a series of up-grade options which can easily be

implemented.

Improved Output stage efficiency

The MSE570 Evo 2 features a chopped constant current output

stage with on-board current settings from 0.5 to 3.5 Amps per phase

to meet the requirements of virtually any 2 or 4 phase hybrid stepper

motor in the Nema 17, 23 & 34 frame sizes. The use of chopped

constant current drive techniques combined with the latest

developments in power stage technology results in significant

advances in efficiency. Furthermore, the output current may be

reduced via an external input when the motor is at standstill to

reduce temperature rise in the drive and the motor. The drive is

designed for use with rail voltages from 15 to 48 Vdc such as

MSE173 when up to 7 drives can be incorporated in a single rack

together with the power supply. For high speed operation the Power

supplies type MSE562 & MSE875 are recommended for single and

multi axis applications depending on motor current settings.

Choice of full or half step drive

The MSE570 may be set to operate in full step or half step drive. Half step drive is recommended since it provides

increased resolution ( 400 steps/rev. using conventional hybrid stepper motors ) together with improved smoothness and

damping of motor resonance.

Thermal Protection

A thermal sensor is fitted to prevent overheating of the output stages.

The drive may be automatically disabled on over-temperature by setting switch SW1-1 on.

Status LED’s for condition monitoring

The MSE570 drive board has five status LEDs. The

status LEDs provide a visual indication of drive

condition. The function of each indicator is shown in

the table. Surface-mount types are fitted as

standard, with provision for the user to fit through-

board types. These may be soldered into locations

at the front edge of the board.

Customising the MSE570 to meet individual application requirements

Choice of external or internal step control

In most applications MSE570 will be operated in conjunction with an external control source consisting of a clock pulse

train to determine rate and distance together with a direction signal. Where operation off line from a control processor is

required a print on the circuit board is provided for the user to add a simple voltage controlled oscillator to facilitate manual

control of the motor drive system.

New Features

• Increased efficiency

• No heatsink required

• Reduces width

• Increased operating voltage

• Single rail supply for both logic

and motor

• Standard Thermal protection &

condition monitoring