CIRCUTOR computer PLUS-TF Series User Manual

Page 39

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NOTE: Any power rating can be used on each step. However, these are usually established in ascending
order, respecting the 1:1:1:1; 1:2:2:2 or 1:2:4:4 ratios. In any case, many other different ratios can be used,
such as 1:1:2:2:3:3:5:8.


7.3.4

Adjusting and configuring the nominal voltage of capacitors

The second Plug&Play step involves the selection of the nominal voltage of capacitors and a star or delta
connection. This information is usually shown on the label of the capacitors with the nominal power rating.

The adjustment method is as described in section 7.2.2 for the Plug&Play settings.


7.3.5

Adjusting the connections of current transformers (CT)

Open the setup menu by following the process described in section 7.3.2

Select the V-I connections option and press

OK . The screen on Fig.47 will be displayed. (The screen

on Fig.45 will be displayed if there are steps connected).

In this case, the phases connected to the VL1, VL2 and VL3 correspond to the phases where the A, B
and C current transformers are connected. Therefore, the default connection is VL1 with IA, VL2 with IB
and VL3 with IC. The unit assumes the default connections and measures the cos

. The values are

shown on the top part of the screen and the phase sequence on the right (123 or 132). The sequence is
measured on the voltage signals. If 132 is displayed, change the VL2 and VL3 voltage cables to correct
the situation. When they are in the correct place, the system will show 123.

Fig. 46.- Connection of transformers

Fig.47.- Transformer connection menu

The screen displayed on Fig.47 shows that the VL1, VL2 and VL3 cables might not match the
corresponding current transformers. The cos

values are not coherent with the expected results (it is

not normal to have an inductive phase and two capacitive phases). Therefore, we must edit the values
on the screen, for example, changing IB by IC and inverting S1-S2 until we obtain a set of coherent cos

values.

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