SMT-BD2
Chapter 1 - General description
1 - INTRODUCTION
Series
SMT-BD2
digital servo modules are sinusoidal PWM power amplifiers that provide speed and torque/force
control for AC brushless motors equipped with encoder only or encoder with Hall Effect Sensors (HES) for the
position feedback. The speed or torque/force input command is a +/-10 V analog signal voltage.
The
SMT-BD2
digital servo drive is 220 VAC or 400 VAC main operated. The
SMT-BD2
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
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
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 position output signals 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
amplifier directly controls the motor torque/force and speed 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
amplifier can be configurated for various encoder types feedback. 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 motor speed or torque/force input command is a +/-10 V analog voltage. 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
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, allows the
clear display and easy modification of all amplifier parameters. The
Visual Drive Setup
software also includes a
digitizing oscilloscope function that is particularly useful for the drive commissioning and maintenance.
7
Chapter 1 - General description
