More output with integrated drive controls - DNAdrive0 pages

More output
with integrated
drive controls
UPM, Nordland Paper, SCA Packaging New Hythe
and M-real Tako Board have recently replaced
drive control systems at their mills with metso­
DNA drive controls. The objective is to improve
operator interface and runnability, and make engineering and maintenance more effective.

C

onventionally, sectional drive control systems have been separate
from the process control system. Under previous “single window”
concepts, systems were integrated only on the operator interface
level. This leads to a significant redundancy of hardware requiring complicated data links between systems and the use of separate engineering
tools. In addition, data collection from a separate drive control system to
the process control system through complicated single window links is
not adequate for today’s fast processes. These problems are compounded
by the task of operating and maintaining separate systems with differing
life cycles, technologies, engineering and operating philosophies.

The single platform solution
Single drives such as frequency converters for pumps and
fans have always been controlled directly from the process control system – earlier using analog signals and today using a fast
field bus like Profibus DP. Metso
Automation can provide a complete system, metsoDNA, to control paper and board machine
functions, including process controls (DCS), machine controls
(MCS), quality control (QCS) and
the sectional drive controls. Different types of sectional drives can
be connected to the system. Older DC or AC drives can be connected with an analog or serial interface and newer drives using a
fast field bus. In rebuild projects,
a mixture of interfaces to various
generations of drives can be easily accomplished. Profibus DP is
a standard, high-speed interface
which is available from all major
drive suppliers. Even drives of different brands can be connected on
the same bus. Operators are presented with a familiar and consistent interface through which they
can perform all drive control and
process control functions.

cal operator panels, it is possible
to operate and analyze all DCS,
MCS, QCS and drive control functions. With the separate drive control system, drive panels are only
used for drive functions.
With the latest features, the
operator interface is fast and intuitive. Unexpected process interruptions are quickly diagnosed
and corrected. Operators have
instant access to diagnostics windows, showing interlocks, drive
faults and alarms associated with
each drive section to quickly identify the original cause of a process halt. Function descriptions of
each drive in addition to DCS and
MCS loops can be shown on the
operator display to help operators
and maintenance personnel to
understand the control functions
and to analyze problems. Using
the same hardware, engineering
tools and operator interface simplifies training, which ensures
efficient operation. Operators can
even document operating experiences directly on the operator station and share their knowledge
with other operators as well as the
management.

Highly efficient
Totally integrated
Operator interface functions, drive controls, drive system diagnostics and alarms are executed by metsoACN process control stations.

ENERGY AND PROCESS
By Pekka Höyssä and Nigel Farrand

22  Automation 2, 2007

The “Integrated Drive Control” application provides all machine related functions required
for drive controls. Drive logic includes for example: stop, crawl,
run, slow run, jog, interlocks,
group controls and start alarm
functions. The drive application
provides speed, torque and load
share setpoints with a selection of
speed or torque control depending
on requirements. The tension control application provides speed or
torque setpoints to the drives to
maintain web tension. From lo-

Common data collection from the
DCS, MCS, QCS and drives enables a system to collect fast data
and show signals in the same freely configurable trend display. Engineering configuration is streamlined with a single, name-based
configuration language and uniform documentation. Hardware
redundancy is eliminated, and a
single set of spare parts covers the
complete system. These advantages, plus the engineering efficiencies, result in long-term maintenance savings. There are no
separate data links between sep-