SAS Single Axis Control

Single Axis Servo, or SAS, is a compact, AC powered servo drive for position, velocity and torque control of AC Brushless and DC Brush Motors. It operates on a distributed control network, as a stand-alone indexing drive, or with external motion controllers.

  • Low Cost
  • High Torque
  • Integrated Driver
  • Indexer, Point-to-Point, PVT Control
  • CANopen/DeviceNet, RS232
Other Controls & Motors

SAS Single Axis Control Features & Benefits

SAS is packaged with an intelligent control to offer a low cost, high performance single axis motor drive solution. Operate as an indexer, or program for point-to-point and/or Position-Velocity-Time (PVT) Motion.  PVT mode gives users direct control over the trajectory profile as you specify the end position or distance, the end velocity, and the piece time

SAS can be operated in Indexing mode to simplify operation with PLCs.  DeviceNet capability enables multiple drives to be controlled from Allen-Bradley PLCs. CAN bus operation supports Profile Position, Profile Velocity Profile Torque, Interpolated Position , and Homing.  Multiple SAS drives can operate linked via the CAN so that they execute motion profiles together.  Up to 127 drives can operate on a single CAN bus.


SAS finds uses in single axis point-to-point applications where high torque / load positioning demand the use of closed loop servo motors

SAS is a good choice where single axis controlled Point-to-Point movement is required. However, Up to 127 drives can operate on a single CAN bus.

Software Support


The most common communication method used by the National Instrument (or LabVIEW) customer is the RS-232 ASCII protocol.  LabVIEW includes general use tools in their software to control both CANopen and RS232 ASCII devices, such as our SAS series control.

Discuss your needs with a Nutec Engineer

SAS Single Axis Control Specifications

Main Input Power




Rated Input Voltage (VAC)


Frequency (Hz)


Phase Requirements

3 φ

Peat time seconds


Output Power


Rated Cont. Output Current per Axis




Peak Output Current (A) for 2 seconds







Internal MOSFET dissipater

Power Dissipation Peak (Continuous) (Watts)

80 (40) Watts

Digital Control


Digital Control Loops

Current, velocity, position. 100% digital loop control

Dual loop position control using secondary encoder input

Sampling rate (time)

Current loop: 15 kHz (66.7 us) Velocity, position loops: 3 kHz (333 us)


Sinusoidal field-oriented control or trapezoidal for brushless motors


 Current loop: 2.5 kHz typical, bandwidth will vary with tuning & load inductance

HV Compensation

Changes in bus voltage do not affect bandwidth

Minimum load inductance

200 μH line-line

Digital Inputs


14: 12 programmable, 1 input dedicated to drive Enable function, 1 for motor temp switch 


8 General-purpose (GP), 3 high-speed single-ended (HS), 2 high-speed differential (HSD), 1 motemp (GP)


74HC14 Schmitt trigger operating from 5.0 Vdc with RC filter on input, 10 kΩ to +5 Vdc or ground (programmable), Vin-LO < 1.35 Vdc, Vin-HI >3.65 Vdc +10 Vdc max for HS inputs, +24 Vdc max for GP inputs 1.5 MHz ma pulse freqfor HS inputs when driven by active (not open-collector) sources


Differential, 121 Ω line-line, 100 ns RC filters to RS-422/RS-485 line rcvrs, +10 Vdc max

5 MHz maximum pulse frequency when driven by differential line-drivers 

Pull-up, pull-down control

GP & HS inputs are divided into three groups with selectable connection of input pull-up/down resistor

to +5 Vdc or ground for each group: [IN1,2,3,4], [IN5,6,7,8], [IN9,10,11]

Digital Outputs



14: 12 programmable, 1 input dedicated to drive Enable function, 1 for motor temperature switch

[OUT1], [OUT2], [OUT3]

Current-sinking MOSFET with 1 kΩ pull-up to +5 Vdc through diode


250 mAdc max, +30 Vdc max

External flyback diode required if driving inductive loads

Brake [OUT4]

Opto-isolated, current-sinking with flyback diode to +24 Vdc, 1 Adc max



Motor Connections

U-V-W phases for brushless, U-V for brush motors


Digital Halls, or sin/cos feedback from ServoTube motors


Digital quadrature A/B/(X) encoders; differential inputs (Standard)

Analog sin/cos enc, 1 Vpeak-peak, differential inp with 121W terminating resistor (option)

Resolver, brushless, single-speed, 1:1 to 2:1 programmable transformation ratio (option)


Digital output, isolated, 1 Adc, +30 Vdc max, programmable, with flyback diode to +24 Vdc


Overtemp sensor

Digital input, non-isolated, 4.99 kΩ pull-up to +5 Vdc, programmable

LED Indicators


Drive Status

Bicolor LED, drive status indicated by color, and blinking or non-blinking condition

CAN Status

Bicolor LED, status of CAN bus indicated by color and blink codes to

CAN Indicator Specification 303-3




126 x 89 x 53 [5.0 x 3.5 x 2.1] mm [in]


0.67 lb (0.30 kg)

About Us

NUTEC Mechatronic Systems' positioning is based on perfection. Engineering and design are focused on details and balanced design, flawless fabrication and precision machining to exacting standards and consistent quality.

Nutec Components
81 Jefryn Boulevard East
Deer Park, NY 11729

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