Issue February 2002
Document Number: 13124
- 10 -
2.
The current transformer shall be installed at a position which ensures that all the subsequent
consumer current, including the capacitor current, will flow through it. Normally, this position is
next to the feed-in transformer and on the load side of the tariff meter reading.
3.
The connecting cable to the current transformer, with a maximum length of 10 m, should have a
minimum conductor cross section of 2.5 mm². If the cable is longer than 10 m, a larger conductor
cross section or a current transformer of a higher rating shall be used.
4.
When an already existing current transformer can be made use of, then all the current paths of the
individual devices shall be connected in series with the
ESTAmat PFC
Controller
. Attention
should be paid that the rating of the current transformer be sufficient.
5. The primary current of the current transformer should coincide with the actual current
consumption of the factory. If the current transformer is overdimensioned, the
ESTAmat PFC
Controller receives too small a measuring signal and, consequently, will work incorrectly or not at
all, and will signalize the fault "undercurrent
≡
I
".
6.
The C/k value is set automatically by the
ESTAmat PFC
Controller
in the initialization modes
AU1
und
AU2
.
Attention shall be paid, however, that the current of the smallest capacitor step at the
transformer secondary is in the range of 0.025 up to a maximum 1.5 A.
7.
In case of several supplies, a summation current transformer is required. In this case, it is
definitely
necessary that the terminals
k (S1)
and
l (S2)
of the individual current transformers be
connected correctly.
Advice concerning the replacement of the P.F. Controller :
When working at the C.T. secondary circuit (e.g. removal of the
ESTAmat PFC),
attention
should always be paid that the C.T. secondary terminals be short-circuited and remain so until
the work is completed (e.g. re-installation of P.F. Controller).
