• Home
  • Products
    • Analog Power OP Amps
      • 100 Volt Analog Power Op Amps
      • 150 Volt Analog Power Op Amps
      • 200 Volt Analog Power Op Amps
      • 300-350 Volt Analog Power Op Amps
      • 500-2000 Volt Analog Power Op Amps
      • Compact Analog Power Op Amps
      • Rail to Rail Analog Power Op Amps
    • Analog Linear Servo Amplifiers
      • LA 100 Series Analog Linear Servo Amplifiers
      • LA-300 Analog Linear Servo Amplifier
      • LA-200/400/500 Series Linear Amplifiers
      • LA-800/1500 Series Linear Amplifiers
      • LALD-400/500/800/1500 Series Low Drift Linear Amplifiers
      • 3U Eurocard Modules/Rackmount Systems
      • 6U Eurocard Modules/Rackmount Systems
    • Intelligent Linear Servo Amplifiers
      • LAD-300S Series Intelligent Linear Servo Amplifiers
      • VLA4 Series Intelligent Linear Amplifiers
      • VLTP Brushless Air Bearing Spindle Controller
    • Digital PWM Servo Amplifiers
      • VSA1 / VSA2 Series Digital PWM Servo Amplifiers
    • Power Supplies
      • VPS-LA-3KVA Stand Alone 3-Phase Linear Power Supply
      • Other DC Power Supplies
    • AC Step Down Transformers
  • Servo Amplifier Sizing & Tools
  • Company
  • News
  • Contact Us
    • FAQ / Support Center
    • Returns/Repairs

Call us 310-542-2320

info@varedan.com
Varedan TechnologiesVaredan Technologies
  • Home
  • Products
    • Analog Power OP Amps
      • 100 Volt Analog Power Op Amps
      • 150 Volt Analog Power Op Amps
      • 200 Volt Analog Power Op Amps
      • 300-350 Volt Analog Power Op Amps
      • 500-2000 Volt Analog Power Op Amps
      • Compact Analog Power Op Amps
      • Rail to Rail Analog Power Op Amps
    • Analog Linear Servo Amplifiers
      • LA 100 Series Analog Linear Servo Amplifiers
      • LA-300 Analog Linear Servo Amplifier
      • LA-200/400/500 Series Linear Amplifiers
      • LA-800/1500 Series Linear Amplifiers
      • LALD-400/500/800/1500 Series Low Drift Linear Amplifiers
      • 3U Eurocard Modules/Rackmount Systems
      • 6U Eurocard Modules/Rackmount Systems
    • Intelligent Linear Servo Amplifiers
      • LAD-300S Series Intelligent Linear Servo Amplifiers
      • VLA4 Series Intelligent Linear Amplifiers
      • VLTP Brushless Air Bearing Spindle Controller
    • Digital PWM Servo Amplifiers
      • VSA1 / VSA2 Series Digital PWM Servo Amplifiers
    • Power Supplies
      • VPS-LA-3KVA Stand Alone 3-Phase Linear Power Supply
      • Other DC Power Supplies
    • AC Step Down Transformers
  • Servo Amplifier Sizing & Tools
  • Company
  • News
  • Contact Us
    • FAQ / Support Center
    • Returns/Repairs
Linear Servo Amplifiers

VLA4 Series Intelligent Linear Servo Amplifiers

The VLA4 combines Varedan’s high performance class AB linear analog ultra-low drift output stage with our new digital control platform. Feedback options include standard incremental quadrature to modern absolute digital systems such as BiSS and EnDat.

 

Easy to Use Graphical User Interface

The PC based VaredanGUI™, with it’s built in command stimulus and real time oscilloscope signal tracer views, reduces the requirements for external equipment while setting up new systems. The standard Ethernet based communications easily connects with all modern computers. Full system configuration can be saved and uploaded for quick and easy drive provisioning.

Real-Time Oscilloscope

VaredanGUI Graphical User Interface

Modes of Operation

Current Mode

In current mode the amplifier is commutated by an external controller. Our Linear Amplifier Series are designed to drive single & 3-phase loads by analog input commands.

These current mode linear amplifiers are available in the following standard configurations:

“T-Mode” – Three-phase current output. This configuration is used for driving three phase rotary or linear motors with a full-bridge output configuration. In this configuration the amplifier receives two sinusoidal current commands for phases A and B (ABSine). The phase C command is generated internally in the amplifier.

“S-Mode” – Single-phase H-Bridge type output. This configuration is used for driving single phase loads such as brush-type motors or voice coils. In this mode the amplifier can deliver the full rail-to-rail bipolar bus voltage to the load.

The following is an example of S-Mode operation.  When operating in full-bridge configuration (Phase to Phase), the maximum bus voltage that can be applied to the voice coil is the full B+ to B- voltage.  For example if you are using a +/-50VDC bus and a full-bridge connected voice coil, the maximum voltage that can be applied to the voice coil is +100V or -100V.  This is illustrated in the following picture which shows positive current from PhaseB to PhaseC (+100V):

Linear Amplifier Sizing
S-Mode Operation

“D-Mode” – Dual independent Half-Bridge type outputs. This mode is used to drive two independent single phase loads, such as brush-type motors or voice coils, with one amplifier module. In this mode the amplifier can deliver half of the full rail-to-rail bipolar bus voltage to the load. The sum total wattage requirements of the two independent loads must be within the capabilities of the amplifier module.

The following is an example of D-Mode operation, (or one or two voice coil connected to a T-Mode amplifier).  When operating in Half-Bridge configuration (Phase to Common), the maximum bus voltage that can be applied to the voice coil is 1/2 of the full +/-Bus supply.  For example if you are using a +/-50VDC bus and a half-bridge connected voice coil, the maximum voltage that can be applied to the voice coil is +50V or -50V.  This is illustrated in the following picture which shows positive current from phaseB to Common (+50V):

The VLA4 can be configured and tuned through an easy to use PC based VaredanGUI™. The VLA4 supports:

linear Amplifier Sizing
D-Mode Operation
  • Single or three phase analog current commands
  • Internally commutated current mode
  • Velocity mode
  • Position mode

Request Application Assistance

Tell us about your application so we can help you select the right solution.

Please use this fillable PDF form to guide you through the information about your application that we need to properly size and select an amplifier for your application.  Please also see out Amplifier Sizing & Tools page for sizing calculators, white papers and other tools.

Standard Models

Amplifier SeriesCurrent Continuous/Peak Power Continuous/Peak ± VDC Bus VoltageDimensionsWeight
VLA4-2102.5/10A200/400W±12 - ±150VDC7.50” x 8.00” x 2.612” 3.60 Pounds
VLA4-4155/15A400/1800W±12 - ±150VDC7.50” x 8.00” x 2.612” 3.60 Pounds
VLA4-52515/25A500/1900W±12 - ±150VDC7.50” x 8.00” x 2.612” 4.60 Pounds
VLA4-54015/40A500/3800W±12 - ±150VDC7.50” x 8.00” x 2.612” 4.60 Pounds
VLA4-82515/25A800/1900W±12 - ±150VDC7.50” x 8.00” x 3.871” 7.80 Pounds
VLA4-84015/40A800/3800W±12 - ±150VDC7.50” x 8.00” x 3.871” 7.80 Pounds
VLA4-152515/25A1500/1900W±12 - ±150VDC7.50” x 8.00” x 4.871” 9.80 Pounds
VLA4-154015/40A1500/3800W±12 - ±150VDC7.50” x 8.00” x 4.871” 9.80 Pounds

Key Design Benefits

  • PC Based Varedan GUI for configuration and tuning
  • Multiple Power Levels Share Common Interface
  • Safe Operating Area Protection of Power Devices
  • Fully Opto-Isolated IO
  • Linear Analog Current Loop for Quiet Operation
  • Analog Current/Torque, Digital Velocity and Position Control
  • Up to 10kHz Bandwidth
  • Single and 3-Phase; Linear, Rotary and Voice Coil Motors
  • Ethernet and RS232 Communications Interfaces
  • Dual feedback ports, input and output, supporting halls, quad, sine and absolute digital encoders
  • Zero Crossover Distortion
  • 24V Keep Alive Option
  • Expansion Interface Board (Optional)
  • Factory or Customer Programmable Options:
    • RMS Overcurrent Trip Level
    • RMS Overcurrent Trip Time
    • Current Loop Bandwidth Options
    • Amplifier Overtemperature Trip Level
    • Absolute Overcurrent Trip Level

Models & Specifications

  • VLA4-200/400/500 Series
  • VLA4-800 Series
  • VLA4-1500 Series
Package TypeDatasheetInstallation DrawingManualSTEP File
Amplifier Module - For high density or OEM applications. Available with or without covers.
Contact Varedan
Stand-Alone Amplifier Package - For "plug & play" applications. Available in a fully enclosed package with built in fan and power supply.Contact Varedan
Contact Varedan
2 Axis Package with 500VA Power Supply (isolation transformer included) - Mounted on a baseplate with built in fan & power supply.Contact Varedan
Contact Varedan
2 Axis Package with 1KVA Power Supply (isolation transformer included) - Mounted on a baseplate with built in fan & power supply.Contact Varedan
Contact Varedan
2 Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan
4 Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan
Package TypeDatasheetInstallation DrawingManualSTEP File
Amplifier Module - For high density or OEM applications. Available with or without covers.
Contact Varedan
1 Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan
2 Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan

Package TypeDatasheetInstallation DrawingManualSTEP File
Amplifier Module - For high density or OEM applications. Available with or without covers.
Contact Varedan
Single Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan
2 Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan

Ask an Engineer

We are here to help. Ask one of Varedan's knowledgable engineers.

Send Message
Let our knowledgeable staff help you with your motion control needs Contact Us Today!
  • Varedan Technologies Group
  • 3860 Del Amo Blvd., Suite 401 Torrance, CA 90503
  • 310.542.2320
  • 310.542.2344
  • info@varedan.com
  • varedan

© 2023 · Varedan Technologies Group

  • Home
  • Products
    • Analog Power OP Amps
      • 100 Volt Analog Power Op Amps
      • 150 Volt Analog Power Op Amps
      • 200 Volt Analog Power Op Amps
      • 300-350 Volt Analog Power Op Amps
      • 500-2000 Volt Analog Power Op Amps
      • Compact Analog Power Op Amps
      • Rail to Rail Analog Power Op Amps
    • Analog Linear Servo Amplifiers
      • LA 100 Series Analog Linear Servo Amplifiers
      • LA-300 Analog Linear Servo Amplifier
      • LA-200/400/500 Series Linear Amplifiers
      • LA-800/1500 Series Linear Amplifiers
      • LALD-400/500/800/1500 Series Low Drift Linear Amplifiers
      • 3U Eurocard Modules/Rackmount Systems
      • 6U Eurocard Modules/Rackmount Systems
    • Intelligent Linear Servo Amplifiers
      • LAD-300S Series Intelligent Linear Servo Amplifiers
      • VLA4 Series Intelligent Linear Amplifiers
      • VLTP Brushless Air Bearing Spindle Controller
    • Digital PWM Servo Amplifiers
      • VSA1 / VSA2 Series Digital PWM Servo Amplifiers
    • Power Supplies
      • VPS-LA-3KVA Stand Alone 3-Phase Linear Power Supply
      • Other DC Power Supplies
    • AC Step Down Transformers
  • Servo Amplifier Sizing & Tools
  • Company
  • News
  • Contact Us
    • FAQ / Support Center
    • Returns/Repairs