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CD1-a
Chapter 1 - General description
Chapter 1 - General description
1- INTRODUCTION
Series CD1-a all digital servo modules are PWM servo amplifiers that provide speed control for AC sinusoidal
motors (brushless) with transmitter resolver.
The CD1-a system is available as a stand-alone single-axis block including all supplies as well as the mains filter,
and is 230 VAC or 400/480 VAC mains operated.
2 – DESCRIPTION / COMPLIANCE WITH THE STANDARDS
2.1 - GENERAL DESCRIPTION
The CD1-a amplifier directly controls the motor torque and speed by means of the information provided by a
transmitter resolver sensor.
The motor speed or torque input command is an analog voltage (± 10 V). The rotor position monitor is available as
two channels A and B in quadrature, and one marker pulse per revolution.
The resolution is programmable. There are 4 possible values: 1024 / 512 / 256 / 128. The main errors are
displayed on the amplifier front panel.
All command parameters are programmable by means of a serial RS232 link and saved in an EEPROM. The
auto-phasing and auto-tuning functions allow the easy and quick commissioning of the amplifier.
The CD1-a amplifiers have their own DC/DC converter to provide appropriate logic voltage to the modules. An
auxiliary 24V
DC +/- 15 % supply is generally available on all machines and supplies a DC/DC converter with all
logic supplies required by the amplifier. The auxiliary supply allows to keep the logic board on, after the power
supply has been switched off, in order to keep the position output and to avoid initializing the machine all over
again. A 24 V
DC battery supply with specific wiring allows to keep the position even after switching off the auxiliary
24 V
DC supply. This wiring can be used for "absolute" operation with the CD1-a amplifier (see chapter 4:
Connections).
The power supply is depending on the amplifier type:
• CD1-a-230/I: 230 V
AC single-phase mains operation power supply or three-phase via a transformer or an
autotransformer or three-phase mains operation if there are three-phase mains available in 200 to 230
V
AC.
• CD1-a-400/I: 400 to 480 V
AC three-phase mains operated power supply.
A soft start system of the power supply allows to limit the inrush current at power on.
The very small dimensions of the CD1-a amplifier allow an optimum integration in 300 mm deep cabinets
(connectors included).
The basic software VISUAL DRIVE SETUP, which is PC compatible with the operating system WINDOWS®,
allows the display and easy modification of all amplifier parameters. The commissioning of the drive is quick and
easy thanks to the "digitizing oscilloscope" function included in this software.
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