CIRCUTOR OPTIM P&P Series - Manual (Page 11)

3.5.-POWER CIRCUIT
Connect input terminals L1, L2 and L3 (power circuit) to the mains using proper sized cable in
accordance with the LVR, ITC-BT-19.
Generally, the cables of the phases adhere to the following colour code: L1 (black), L2 (brown),
L3 (grey).
If auxiliary voltage is required, the neutral cable will be connected to N (blue colour)
In order to determine the size of the phase cables, the nominal current I
n
must be taken into
account, indicated on the unit label, and it should be able to withstand an overload in transients
of 1.5 times I
n
. The neutral cable will be a minimum of 1.5 mm 2 .
3.6.- EXTERNAL CIRCUIT BREAKER AND PROTECTION ELEMENTS
If the capacitor bank does not have an internal switch or isolation switch, it must be connected
to a line that has an external switch or isolation switch.
The protection elements, isolation switches and/or switches that are added exter-
nally to the capacitor bank must be of a minimum size to withstand a current 1.5
times greater than what is indicated on the label (LVR, ICT-BT-48)
If an earth leakage protection for the capacitor bank is installed, its sensitivity and
trip delay must be adjustable.
When the capacitor bank is connected to the mains, it is recommended that the current
transformer (CT) is placed on the phase going to L1 (black cable).
Outputs S1 and S2 of the CT must be connected to the terminals with the same name.
3.7.- AUXILIARY CONTROL VOLTAGE
Control circuits are defined as those related with regulator output relays and the capacitor's
operating contactors. These circuits are usually powered with an auxiliary voltage of 230 V
~ (the most common case) or other voltages such as 110 V ~ (frequently for 500 V or 690 V
capacitor banks).
There are two possible ways of powering the circuit:
11 Instruction Manual
OPTIM P&P Series