Issue February 2002
Document Number: 13124
- 17 -
The transformation ratio of the current transformer can be set by means of the parameter
-18-
. (Refer
to item 6.3.18). This way, the actual primary C.T. current can be displayed.
The portion of harmonics will increase as a function of the increased deviation between root-mean-
square current and fundamental frequency current.
5.4. Mode target
cos
ϕ
By means of the keys and the target power factor can be
set in the range of 0.85 inductive (
0.85
) up to 0.95 capacitive (
-0.95
). A minus in front of the
power factor means that the power factor is capacitive.
When pressing simultaneously the keys the standard setting
1.00
for the
target cos
ϕ
is produced.
The value shown when the setting mode for the
target cos
ϕ
is left will be
stored.
5.5. Mode switching delay time
The period between surpassing the hysteresis and starting the switching procedure is defined as
switching delay time. The condition of surpassing must be given permanently during the determined
switching delay time. The switching delay time can be determined by the
ESTAmat PFC
Controller
as a function of load, or it can be fixed by the operator.
The following fixed switching delay times are possible:
10
,
30
,
60
,
120
,
180
,
300
and
500
seconds.
Determination of the switching delay time as a function of load is activated when the display indicates
LOAD
. The switching delay time may range between 2 and 500 seconds.
By means of the key
or the desired switching delay
time or the function
LOAD
can be selected.
By pressing simultaneously the standard setting
LOAD
is produced.
The selected value is stored by means of the key and the menu indicator
changes to the next menu.
By means of the parameters 8 and 9 (items 6.3.8 and 6.3.9), fixed switching delay times can be set
separately for the switching-in and the switching-out of capacitors. In this case, the flashing LED
IND
signalizes a fixed presetting for the switching-in delay time while the flashing LED
CAP
indicates a
fixed presetting for the switching-out delay time.