RUSSULA NEWSLETTER No. 11

RECENT PROJECTS
The new control system layout for EAF 1 atVotorantim Siderúrgia
tilting and roof removal mechanism
The existing Rockwell SLC 500 PLC
contained the logic responsible for
controlling and monitoring the furnace
instrumentation: temperatures
for inlet water for the shell and roof,
chilled panels and furnace floor;
pressure switches for chilled arms,
structure, wall plate, moving elbow
and burners; pressure transducers
for inlet and outlet water for housing
and EAF roof. This PLC also interfaced
with the SIA melt shop
system, which interfaced with the
burners PLC and dedusting PLC.
As stated previously, the revamp
simplified the existing control configuration
to one single platform.
Russula supplied a new MCC, responsible
for the medium tension
electrical distribution to: the PLC
panel +K2, remote panel +K1, central
control desk +P1, panel of hydraulic
changes (existing), panel
AMI-GE PLC (existing), graphite
machine (existing), transformer and
switch oil pumps (existing), pressing
machine tubes (existing), main
circuit breaker Joslyn (existing),
panel of oxygen robot MOX (existing),
panel of temperature robot and
rotating robot (existing) and blow
torcher´s panel; Motors 1 and 2 for
water pumps driven by Sirius Soft
Starter, drain pump, recirculation
pumps 1 and 2, electrode fixing
pump, air compressor, oil pressure
pump of regulator tank and retractable
platform motor via
Simocode C; EBT (Eccentric Bottom
Tapping) ladle car drive motors 1
and 2, graphite machine motor and
furnace disconnect, via Sinamics
PM240; power meter of 23kV input
network through a Siemens
PAC4200 multimeter.
Russula provided a Siemens S7-400
PLC and a remote ET-200M to
control the furnace components, instrumentation
and the discrete interface
with existing subsystems.
In addition Russula supplied a new
cover for the main control desk, a
new casting desk and a new hydraulic
control desk. All the existing
cables were replaced with new cables,
existing cable trays were relocated
and new trays provided when
necessary. The Wonderware Intouch
HMI screeens made navigation
and viewing easy through the
use of two 21" monitors. Operators
can now view the fusion states,
movements, cooling, hydraulics,
power meters, trends, alarms and
events. Russula also provided an
IBA data acquisition system to assist
operations and maintenance for registering
the relevant data to the furnace
in real time.
21 Russula Newsletter No. 11 April 2015 - Copyright © by RUSSULA S.A. S.A.