TECHNOLOGY
DISTRIBUTING
OPTIMUM LOADS
Compiled by Tarren Bolton
New plug-and-play controller extends Siemens mining portfolio.
S
iemens is extending the Simine
portfolio for high-pressure grinding
mills (HPGR) to include a new
controller; its plug-and-play functionality
makes the load share controller available
for immediate use.
The web-server based operator
interface allows the process engineer
at any time (online and off-line) to adapt
the controller parameters and therefore
optimise the torque distribution. The
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SEPTEMBER 2019
controller is already being successfully
used by one customer.
The new load share controller follows
established control scheme. During start
of the HPGR the Load Share Controller
is inactive. When a certain torque level
has been reached the controller takes
over load share control already during
mill start. If the controller is not ready
for use, for example, in the event of
disruption, the drives do not start.
However, operation without load sharing
is available. In this case the drives
take the speed reference from the mill
automation.
Variable load distribution
The load distribution between the rollers
in an HPGM is generally 50:50. The
master follows the speed command
and the slave follows the torque of the
master. If an alternative load distribution
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