25A Series
A-6
DESCRIPTION:
The 25A Series PWM servo amplifiers are designed to drive brush type DC motors at a high switching
frequency. A single red/green LED indicates operating status. All models are fully protected against over-voltage, over-
current, over-heating and short-circuits across motor, ground and power leads. All models interface with digital controllers
or can be used as a stand-alone drive. They require only a single unregulated DC power supply. Loop gain, current limit,
input gain and offset can be adjusted using 14-turn potentiometers. The offset adjusting potentiometer can also be used
as an on-board input signal for testing purposes when SW4 (DIP switch) is ON.
SPECIFICATIONS:
MODELS
POWER STAGE SPECIFICATIONS
12A8
25A8
20A14
20A20
DC SUPPLY VOLTAGE
20 - 80 V
20 - 80 V
40 - 140 V
40 - 190 V
PEAK CURRENT (2 sec. Max., internally limited)
±
12 A
±
25 A
±
20 A
±
20 A
MAXIMUM CONTINUOUS CURRENT (internally limited)
±
6 A
±
12.5 A
±
10 A
±
10 A
MINIMUM LOAD INDUCTANCE*
200 µH
200 µH
250 µH
250 µH
SWITCHING FREQUENCY
36 kHz
22 kHz
±
15%
HEATSINK (BASE) TEMPERATURE RANGE
0
o
to + 65
o
C, disables if > 65
o
C
POWER DISSIPATION AT CONTINUOUS CURRENT
24 W
50 W
70 W
100 W
OVER-VOLTAGE SHUT-DOWN (self-reset)
86 V
86 V
142 V
195 V
BANDWIDTH (load dependent)
2.5 kHz
MECHANICAL SPECIFICATIONS
POWER CONNECTOR
Screw terminals
SIGNAL CONNECTOR
Molex connector
SIZE
5.09 x 2.98 x 0.99 inches
129.3 x 75.8 x 25.1 mm
WEIGHT
10 oz.
0.28 kg
* Low inductance motors ("pancake" and "basket-wound") require external inductors.
ELECTROMATE
Toll Free Phone (877) SERVO98
Toll Free Fax (877) SERV099
www.electromate.com
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