Product Bulletin Release No.1 Oct 2002

DILEOREG

THE DIGITAL INTEGRATED
WARD LEONARD REGULATOR

AN APPLICATION ENGINEERED SYSTEM CUSTOMIZED FOR YOUR PLANT

1. Purpose

The objective of the “DILEOREG” Digital Integrated Ward Leonard Regulator is to provide full closed loop field control of a Ward Leonard unit in order to maximise operational efficiency.

2. Overview

“DILEOREG” is a cost effective closed loop regulator for Ward Leonard drives for the following applications:
· Winder.
· Elevators.
· Mills and other processing drives.
· Cranes.
· Drag lines.
· Machine tools.

The “DILEOREG” is in the form of a bolt-on upgrade for existing equipment and consists of a packaged 4 quadrant digitally controlled converter for the generator field excitation; a 2 quadrant current controlled converter for motor field excitation; a PLC based regulator for control and logic; and auxiliary items. It is accompanied by a complete set of detailed schematics, software printout and maintenance documentation.

3. “Dileoreg” Features

The “DILEOREG” control system will have the following features:
· All digital regulator, protection and logic functions.
· Password restricted access to limiting parameters.
· Parameter accesses via integral keyboard and display.
· Converter and PLC are PC programmable.
· PC diagnostics support.
· Supports standard communication protocol.
· Uses encoders for position and speed feedback signals.
· Minimum plant shutdown for changeover and commissioning.
· Regulator customised for each particular application.
· DC machine protection functions.
· Supports multi-machine drives.
· Supports both armature loop circuit breaker and field discharge schemes.
· No analogue adjustments required.
· Enables (and controls) automatic operation.
· Current and / or EMF control loops.
· Local safety circuit with annunciator.
· Safety circuit bridging facilities.
· Complete interface to plant equipment.
· Interlocked test mode via keyboard.

4. Field Converter

The field converter is equipped with its own diagnostic features that are accessible via a local display as well as its serial communication port. An INTEL 32 bit microchip performs all processing functions. The system firmware is stored in EPROM and the user parameters are stored in flashram. A range of current ratings is available to suit a range of drives with field currents from 30 amps to 200 amps. The anode supply transformer is selected to suit the particular application.

5. Field converter Features

The field converter has the following features:
· Self-diagnostic.
· Auto-optimisation of loops.
· Current regulator trace.
· Speed regulator trace.
· Variable current limit.
· Predictive bridge selection.
· Adaptive gain when the field current is discontinuous.

6. PLC Based Regulator and Logic

An industrial standard PLC is used, and includes all necessary I / O for the regulator and its functions, as well as the provision for the plant interface and other plant control functions as required.

7. REGULATOR FUNCTIONS

The regulator has the following functions:
· 4 quadrant 6 pulse converter.
· Firing pulse control.
· Bridge selection control.
· Generator field current control.
· Generator armature current control.
· Motor speed control.
· Motor torque control.
· Speed reference ramp function.
· Speed reference generation.
· Position control.
· Position reference profiling.
· Speed reference profiling.
· Torque reference profiling.

8. Protection Functions

The protection functions are as follows:
· Armature over current.
· Armature over voltage.
· Motor over speed.
· Motor stall.
· Zero current failure.
· Motor thermal limit.
· MG set tripped.
· Regulator failure.
· Converter failure.
· Control supplies off.
· Transducer failure.
· RAM check-sum.

9. Access Display Data

The access display data provides the following:
· Regulator variables.
· Operating variables.
· Protection parameters.
· Operational status.
· Diagnostic data.

10. Keyboard Functions

The keyboard provides the following functions:
· Systems access.
· Parameter value entry.
· Set operating mode.
· Test injection.

11. General

The whole assembly is fully shop tested prior to delivery.
The installation is carried out with minimal interference with normal operations.
Commissioning and setting to work is carried out over a shutdown weekend.