Issue February 2002
Document Number: 13124
- 8 -
2.12. Parallel operation
In case two network sections, each with independent power factor control equipment, are
interconnected, the two power factor controllers influence each other, because the currents distribute
across the two transformers. In such a case, to avoid hunting of the two power factor controllers, the
C/k-values should be set differently. The result will be a so-called "lead-follow" - behavior because
both controllers react at a different speed. The power factor controller with the lower C/k value is
quicker in switching than the one with the higher C/k value.
The target cos
ϕ
values of both power factor controllers should be the same. If this is not the case, the
power factor controller with the higher setting would try to switch in steps which the power factor
controller with the lower setting would again switch out immediately. This would also result in an
unacceptable hunting between the switch-in and switch-out operations.
2.13. Interface
The
ESTAmat PFC
is equipped with a serial interface
RS232
. By means of a computer, all relevant
measuring values and Power Factor Controller data can be requested. Furthermore, all Power Factor
Controller's parameters can be modified via a computer. The computer software and the connection
cable
ESTAmat PFC
to the computer are available at option.
