Circutor computer MAX 6 - PROGRAMMING THE CT RATED CURRENT (PRIMARY); SET-UP MENU AND PROCEDURE; HOW TO ACCESS THE SET-UP MENU

23
Instruction Manual
computer MAX
This parameter permits the adaptation of the regulator to different options of connection of
voltage and current measurement in the three phase system. The default assumed connection
is the one shown in
Figure 4 and Figure 5, i.e., the current transformer placed in phase L1 and
voltagemeasurementbetweenphasesL2(terminalC)andL3(terminalD).
Sometimesit’sdifculttoguaranteethisconnectionorevencheckhowitis.Toadapttothis
unknown situations the computer MAX devices allow the selection of different options, T1 to
T6, as shown in
Table 12. To select the right option during start up, you should verify that there
is load and that the loads are mainly inductive with a cos j between 0,7 y 1. In this situation try
the different options until the cos j screen shows a value between 0,7 and 1.
Table 12: Phase shift options in computer MAX
Screen
U-I phase shift
at cos
j=1
V measured in
phases
CT placed in phase
T1 30º L3-L2 L3
T2 270º L3-L2 L1
T3 150º L3-L2 L2
T4 210º L3-L2 L3(P1-P2orS1-S2reversed)
T5 90º L3-L2 L1(P1-P2orS1-S2reversed)
T6 330º L3-L2 L2(P1-P2orS1-S2reversed)
6�1�9�- PROGRAMMING THE CT RATED CURRENT (PRIMARY)�
The set-up of this parameter can be selected at the bottom of the menu options. Use the
keys until the bottom red LED
isashingandpush .
The display will show the assumed CT primary current. Set the value according to the CT used
to measure installation current. The adjustment range is from 0 to 999 and with the x10 option
allows a rated primary current up to 9990 A. By default the secondary of CT is assumed to be
5 A.
6.2.- SET-UP MENU AND PROCEDURE
6�2�1�- HOW TO ACCESS THE SET-UP MENU
To access the set-up menu, press the key
formorethan1s(Thisisdesignatedaslongpush
in
Table 13, which gives a summary of the set-up procedure). The pointer starts blinking and
points to the parameter to be adjusted. Select the parameter by means of the keys
.
After the long push and in case that all the capacitor stages are disconnected, the device
jumps to the set-up status. In case that there are some stages connected, keep the key
pushed while the regulator disconnects the connected stages sequentially and respecting the
programmed delay time. Once all the stages have been disconnected the device enters the
set-up status and allows the adjustment of the different parameters.
A schematic diagram of the set-up menu showing the different navigation paths is shown in
Table 13� The meanings of the different adjustable parameters have been explained in “6.1.-
CONFIGURABLE PARAMETERS”
.