MTS TBF120/7R Resolver Servo Amplifier
The MTS TBF120/7R is a resolver-based, pulse-width-modulated (PWM) servo amplifier from the R series, designed to control brushless servo motors. It extracts resolver signals from the motor to provide sine commutation and speed feedback, enabling high-precision closed-loop speed and position control. The amplifier also generates simulated incremental encoder signals, allowing easy integration into industrial automation systems with standard PLCs.
Technical Specifications
Series: MTS R series servo amplifier (resolver type)
Nominal Voltage: 120 V AC
Continuous Output Current: 7 A (peak value)
Pulse Current Limit (peak): 18 A (configurable)
Intermediate Circuit Voltage (DC link): Max 170 V DC, min 70 V DC
Control Principle: 3-phase, pulse-width modulated (PWM), 4-quadrant operation
Commutation: Sine commutation based on resolver feedback
Feedback Interfaces: Resolver (speed & commutation), simulated incremental encoder output
Input Signals: Differential nominal speed input, enable input, limit switch inputs (PLC-compatible)
Protection Functions: Undervoltage, overvoltage, overcurrent, overtemperature, short-circuit, ground fault
Diagnostic LEDs: LED1 green (ready), LED2 yellow (current limit active), LED3 red (fault), LED4 yellow (ballast circuit active - 120V only)
Adjustable Potentiometers: Signal scaling (speed), pulse current limit, speed controller gain, offset, continuous current limit
Test Points (MP0-MP6): Ground reference, nominal speed input, speed controller output (10V ≈ 18A), tachometer voltage (10V ≈ 6000 rpm), fault diagnosis, phase current monitors U/V
Mounting: 3HE Euroformat, 19-inch slide-in rack
Power Supply Options: Internal intermediate circuit power or battery power
Operating Temperature: 0°C to +55°C
Storage Temperature: -20°C to +85°C
Weight: 1.85 lbs (approx. 0.84 kg)
Circuit Technology: Hybrid technology / SMD technology
High-Performance Motion Control
The TBF120/7R provides 7A of continuous current with PWM power amplification, making it ideal for low to medium power applications. Its resolver-based sine commutation ensures smooth torque and efficient motor operation. The amplifier supports both open-loop and closed-loop configurations, and its simulated incremental encoder output allows the amplifier to interface with controllers that expect standard encoder feedback, eliminating the need for additional adapters.
Flexible Integration and Diagnostics
The amplifier features a wide range of configurable settings via front-panel potentiometers: signal scaling, pulse current limiting, speed controller gain, offset adjustment, and continuous current limit. The test points provide direct voltage readings for key signals, enabling precise tuning and troubleshooting. The 19-inch rack form factor is compatible with standard industrial control cabinets. The amplifier also supports internal intermediate circuit power or external battery power for applications requiring backup operation during power interruptions.
Application Domains
The MTS TBF120/7R is suitable for servo motor control in industrial automation, robotics, CNC machinery, test equipment, and high-precision positioning systems. Its combination of resolver-based commutation, flexible protection features, and simulated encoder output makes it a reliable choice for demanding motion control applications.
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