MSA-12-80
M O T O R S / D R I V E S
Amplifier for Brush Motors
Product Description
The MSA-12-80 miniature servo amplifier is a low-cost,
easy-to-use amplifier for driving brush-type servo
motors at high switching frequencies.The amplifier
utilizes power MOSFETs and
surface mount technology
to produce high power in a
small package.The MSA-
12-80 accepts a ±10 V
range input signal directly
from Galil programmable
motion controllers, or it can
be configured as a stand-
alone drive.An unregulated
DC power supply is required
to drive the MSA-12-80,
which is available from Galil
as the CPS Series described
at the end of this section.
Features
For brush servo motors
Miniature size; only 5"x 3" x 1"
2000 watts peak; 20 to 80 VDC,12 amps continuous,
25 amps peak
Pulse-width-modulated at 36 KHz, 97% efficiency
Protection against over-voltage,over-current,over-heating,
and short circuits across motor, ground,and power leads
Adjustable loop gain,current limit,and offset
Four-quadrant regenerative operation
Operates off single,unregulated DC supply,also available
from Galil
Surface mount technology for high reliability
No external heatsink required
MSA-12-80
Servo Amplifier
Power Rating
DC supply voltage: 20V minimum, 80V maximum
Peak current: 25 amps, 2 sec.maximum
Continuous current: 12 amps, internally limited
Electrical Specifications
Minimum load inductance: 250µH
Power dissipation at max. continuous current: 15W
Over-voltage shut-down: 86V
Current loop bandwidth: 2.5kHz typical
Heatsink temperature range: -25 to 65 °C;
shuts off if above 65 °C
Switching frequency: 36kHz
Physical
Dimensions: 5.09"
×
2.98"
×
.94"
Weight: 10 ounces
Modes of Operation
The MSA-12-80 can operate in three modes: current,
voltage, or velocity.These modes are set by two switches,
SW1 and SW3. SW2 is always off.
SW1 SW2 SW3 SW4*
Current mode
OFF
OFF
ON
OFF
Voltage mode
ON
OFF
OFF
OFF
Velocity mode
OFF
OFF
OFF
OFF
The current mode of operation is the most common setting
for use with Galil motion controllers.
* SW4 ON will result in a very high gain on Port 4.This is not desired
during normal operation.
MO
TORS / DRIVES
80
www.galilmc.com / Galil Motion Control, Inc.
