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CHAPTER 1 – General description
SMT-BD2/m
CHAPTER 1 - GENERAL DESCRIPTION
1 - INTRODUCTION
Series
SMT-BD2/m
digital servo modules are sinusoidal PWM power amplifiers that provide position, speed and
torque/force control for AC brushless motors (rotating or linear) equipped with encoder only or encoder with Hall
Effect Sensors (HES) for the position feedback.
The
SMT-BD2/m
digital servo drive is 220 VAC or 400 VAC main operated. The
SMT-BD2/m
plug-in system with
400 VAC power supply is available as a multiaxis version that can receive up to three axes in a standard 19" rack
including the power supply. The
SMT-BD2/m
plug-in system with 220 VAC power supply is available as a single-
axis block version or as a multiaxis version that can receive up to six axes in a standard 19" rack including the
power supply.
2 - GENERAL DESCRIPTION
Series
SMT-BD2/m
amplifiers have their own DC/DC converter to provide the appropriate supply voltage (+5 V,
+15 V, -15V). The source supply voltage for the logic board is the auxiliary 310 VDC supply voltage. The auxiliary
supply voltage allows to have the axis position value still available when the power supply voltage is turned off.
Each module is packaged as a 6 U "double Eurocard":
- one power board with IGBT transistors
- one logic board with DSP (Digital Signal Processing).
The
SMT-BD2/m
amplifier directly controls the motor torque/force, speed and position by means of the
information provided by an encoder feedback device. The sinusoidal current commutation based on encoder
feedback provides smooth motor torque/force control.
The
SMT-BD2/m
amplifier can be configurated for various encoder feedback types. The appropriate encoder
input configuration is selectable by jumpers.
♦
With an incremental encoder only, a motor phasing procedure must be executed at each amplifier power up
before the motor enabling.
♦
With an incremental e HES feedback from the motor, the motor phasing procedure is no more
necessary and the servo motor can immediately be enabled after the amplifier power up.
♦
With an absolute single turn SinCos encoder feedback from the motor (Heidenhain ERN 1085 or compatible),
the servo motor can also immediately be enabled after the amplifier power up.
The
SMT-BD2/m
amplifiers are suited for axis positioning applications. Up to 128 control sequences including
axis homing, absolute or relative displacement, speed profile running and torque regulation can be programmed
and combined in order to solve various applications. The sequence chaining capability allows to define macro-
sequences for complex applications: several control sequences can be linked together in order to be automatically
executed one after the other. The control sequences are pre-programmed. So, the application programmation
simply consists in initializing the sequences parameters with the desired values. A control sequence can then be
selected by using the programmable logic inputs activation and its execution is started by using the START logic
input. The
SMT-BD2/m
amplifiers can operate in stand alone or in connection with a host controller (PC or PLC).
The motor position output is available as two A and B encoder type channels in quadrature, and one Z marker
pulse per revolution via RS422 line drivers. The ratio between the number of pulses on the motor encoder and the
number of pulses on the
SMT-BD2/m
amplifier encoder output is programmable.
The amplifier faults are displayed on the front panel and can also be read via the serial link.
All control parameters are programmable by means of the serial link and saved in an EEPROM. The auto-
configuration and auto-tuning functions allow an easy and quick commissioning of the amplifier.
The
Visual Drive Setup
software, which is IBM-PC compatible with the WINDOWS® operating system, makes
the amplifier commissioning and the application programmation easier. The
Visual Drive Setup
software also
includes a digitizing oscilloscope function that is particularly useful for the drive commissioning and maintenance.