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
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 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.
Efficient chopped constant current drive
The MSE570 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 eliminate power consuming series resistors normally
associated with low cost drives. 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 24 to 35 Vdc such as MSE173
when up to 4 drives can be incorporated in a single rack together with
the power supply. For high speed operation the 35 Vdc Power
supply type MSE562 is recommended for single and dual 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.
Customising the MSE 570 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 the 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.
Thermal Protection
A thermal sensor may be fitted to prevent overheating of the heatsink and output stages. The sensor, such as the Airpax
type 67L080, may be clipped to the heatsink and soldered in position at location ‘SW3’ When fitted an over-temperature
signal is provided @ pin 20C This condition may be latched by setting SW1-2( LT ) on. The drive may be automatically
disabled on overtemperature by setting switch SW1-1 on.
Status LED’s for condition monitoring
Provision on the MSE 570 drive board has been
made for the user to add five status LED’s. These
may be soldered in location at the front edge of the
board to provide a visual indication of drive
condition. The function of each indicator is shown in
the table.
Mclennan Servo Supplies Ltd.
Tel: +44 (0)8707 700 700 www.mclennan.co.uk
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