User manual

3U Servo Amplifier
INTRODUCTION
This document provides user data and support for the 3U Geo Direct PWM drives 3U042. Geo drives are
brushless drive amplifier modules designed and manufactured by Delta Tau Data Systems, Inc.
The 3U042 is a 3U size Geo Direct PWM amplifier designed to drive up to two axis with 4A RMS
continuous and 8A RMS peak (2 seconds). These drives are low power amplifiers designed to drive
permanent magnet brushless (rotary or linear), AC induction and DC Brush type motors from PWM
(pulse width modulated) command signals. These drive systems are designed to fit into a standard 3U
rack. The 3U Geo Direct PWM drives will operate directly off the power mains wired to the backplane,
typically 230VAC or 110VAC, three phase or single phase with the appropriate derating. An external
power supply of +24 VDC @1A (unregulated) is required for logic power allowing the user to control
motor power separately from control logic power. The amplifiers are interfaced to a PMAC controller via
ACC-24E2, ACC-24E2M, ACC-8F or ACC-8FS or other digital output servos.
These drive amplifiers are designed to receive logic-level direct digital PWM motor voltage command
from the controller and convert them to high voltage for motor control. They provide the power
conversion, motor current sense feedback to the controller, and comprehensive system protection. Each
drive also accepts motor thermal overload sensors for drive shut down on motor over temperature. The
host controller provides all other motor control functions.
Product Features:
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High power density
Extensive fault protection
Locking motor connectors
Closed loop hall effect current sensors
Direct line connection with Soft Start
Separate logic and motor power control
3U format for small size and easy support
Full isolation for PMAC and user interfaces
Direct PWM control for best performance and cost
Shunt Regulator (requires external Resistor) for Bus power control
Auto ranging Shunt Regulator automatically selects for 115 or 230V operation
The 3U Geo Direct PWM drives consist of three basic components: 3U format Drive Module, backplane
that gives access for the power supply and associated metal work with fan for keeping the drive cool.
Both the drive modules and backplane may be purchased separately as spares. This family of products is
further supported with the availability of cable or connector kits and compatible shunt regulator resistor
(regen resistor).
The amplifier has many protection features to ensure the proper operation and protection of all of the
components connected to the unit. When the amplifier detects a fault, the unit will display a character
indicating the type of fault. Even though backup protection is provided, the PMAC controller should
have the I
2
T protection variables set up to protect the amplifier from over current over time.
The following is a list of the faults detected by the logic of the amplifier:
Instantaneous over current
Integrated current over time (I
2
T)
Backplane Board 1