CIRCUTOR OPTIM-FR Series - Manual (Page 10)

Instruction Manual 8
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FR filter bank with an auxiliary voltage obtained from an internal
AUTOTRANSFORMER
This configuration does not require the connection of the external neutral. The label box
U
aux
/f in such equipment indicates "interna"
•
FR filter bank with auxiliary voltage obtained between PHASE and NEUTRAL
Requires the connection of the external neutral to terminal N (see Fig. 5-2 and Fig. 5-4.
The label box U
aux
/f in such equipment indicates the value of control voltage (usually
230V)
Fig. 5-1 .- Auxiliary power supply with
autotransformer
Fig. 5-2 .- Auxiliary power supply with neutral
5.3.4 Earth cable connection
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Connect the earth terminal of the filter bank located inside the equipment control cabinet (see
Fig. 4-3) to the exterior earth connection. The earth cable section will be selected in
accordance with the admissible current limits established in the REBT ( ITC-BT-19 – Indoor or
receiver installations).
5.3.5 Connecting the current transformer (CT)
A current transformer (TC) that is external to the filter bank must be installed to
measure the total load current plus that of the filter bank (see Fig. 5-3).
The standard transformer must have a nominal output of 5A at the secondary.
We recommend connecting the TC to phase L1 in the direction of the current flow
from P1 to P2 (see Fig. 5-3) and connecting the secondary (terminals S1, S2) to the
terminals with the same name on the filter bank (see Fig. 5-3).
Avoid the flow of current through the TC's primary before connecting the secondary
to the filter bank's S1 and S2 terminals. If the TC must be installed while the
installation is under load, short-circuit S1 and S2 while they are not connected to the
filter bank.
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The current value of the TC primary winding must be equal to or slightly greater than the size
of the installation's mains switch. Therefore, the TC must be able to measure the maximum
forecast current consumption that will be consumed by all the loads being compensated.