Glentek Inc. 208 Standard Street, El Segundo, California 90245, U.S.A. (310) 322
SMA7130, SMA71075 and SMA71100 MANUAL
Chapter One: Description, Features and Specifications
1.1 Description:
This brush type servo amplifier system has been designed to offer you, our customer, a large degree of
flexibility and customization with a standard, in stock product. The amplifier is of a modular, ‘open’ construction
for ease of installation and service.
The amplifier system is available in the following types of configurations:
• As a stand alone one axis amplifier, SMA7130-1A-1, SMA71075-1A-1 and SMA71100-1A-1, which contains
a DC power supply, cooling fan, soft start circuitry, fusing and a shunt regulator. Please see section 1.2.2
for more detailed information.
Each amplifier accepts a bipolar DC control input. The polarity of this signal determines the direction of
rotation. This signal may be used to control either the velocity (RPM) or the current (torque) of the motor (see
Servo Loops, section 2.3). The amplifier provides Pulse-Width Modulated (PWM) power to the motor in
proportion to the input signal.
Each amplifier has several ‘logic’ inputs to stop the motor in one or both directions. These inputs are very
useful for connecting to mechanical limit switches or digital equipment.
Each amplifier has several protection circuits to protect the amplifier, motor, and operator from almost any
kind of fault. LED’s show what fault has occurred, and a separate output can be used to signal other equipment.
1.2 Features:
1.2.1 Stand-Alone One Axis Amplifier (SMA7130, SMA71075 and SMA71100):
• Ergonomic design: Easy access to connections, adjustments, and test points.
• Complete isolation: Complete isolation from input to output.
• Dual signal inputs: One single-ended and one differential. Both single-ended inputs may be use
simultaneously. All inputs have up to 15,000A/V gain (velocity mode), and inputs
will accept up to ±13VDC for the differential input and ±50VDC for single-ended.
• Dual mode operation: The amplifier may be field configured for velocity (RPM) control or current torque)
control.
• Current limit: Maximum peak motor current is adjustable.
• Digital limit/enable Three separate logic inputs can stop the motor in either or both directions.
Inputs: Inputs may be configured for active-high or active-low, pull-up or pull-down
termination, and a 0 to +5VDC or 0 to+15VDC range. See Logic Input
Configuration, section 5.2.
• Fault input/output: Open-collector output goes low in the event of a fault. Externally forcing the
output low will inhibit the amplifier. This allows all fault outputs in a multi-axis
system to be connected together (wire-ORed) to shut down all amplifiers should
any amplifier have a fault.
• Silent operation: Carrier frequency is 20KHz for the SMA7130 and 9KHz for the SMA71075 and
SMA71100.
• Short circuit protection: Complete short circuit and ground fault protection.
• LED diagnostics: A Red LED flashes to display various fault conditions and a green LED illuminates
to indicate normal operating conditions.
• Tach or encoder A tachometer (standard) or encoder (optional) velocity feedback personality board.
feedback:
CHAPTER 1: DESCRIPTION, FEATURES AND SPECIFICATIONS
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