CIRCUTOR OPTIM-FR Series - Manual (Page 9)

Instruction Manual 7
5.2 Installation location
It is important to maintain a minimum distance around the equipment to facilitate cooling. In self-
supporting cabinets, the back and front sides of the cabinet must be placed at least 50 cm away
from other walls and equipment. Regarding the side faces of the cabinet, it is recommended to
keep a gap of 10 cm with adjacent equipment. On wall mounted cabinets, it is recommended to
keep a gap of at least 20 cm between the side faces of adjacent equipment.
Make sure that the equipment can be accessed easily.
The environmental conditions of the location where the equipment is installed must not surpass
the limits established in the technical characteristics (See section 4.3)
To ensure proper ventilation, the unit must be installed in a vertical position.
In accordance with the EEC LV Directive, once the unit is installed, it must be protected against
direct and indirect contacts. Therefore, an earth leakage or insulation surveillance device must
be installed for the protection of the power supply line and the filter bank.
5.3 Connection of the filter bank to the grid
Check that the nominal voltage of the FR filter bank matches the phase to phase
voltage of the grid where it is being connected. Also check the auxiliary control voltage
(contactors supply). For this, refer to section 5.3.3
For the feeding cables of the filter bank cabinet, use always the entry windows
available for this purpose.
Do not drill holes into the cabinet for feeding cables through them or for installing
support brackets. Drilling produces metal shavings that may enter the contactors or
other switching or protection devices and cause short-circuits.
5.3.1 Power circuit.
•
Connect input terminals L1, L2 and L3 (power circuit) to the grid using proper sized cable in
accordance with the the EEC LV Directive. Generally, the cables of the phases follow 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)
•
To determine the size of the phase cables, the maximum nominal current I
max
shown on the
equipment's label and a transient overload of up to 1.5 times I
max
must be taken into account.
The neutral cable must be at least 1.5 mm2.
5.3.2 External insulation and protection elements
•
In case the filter bank does not have an internal switch or circuit breaker, it must be connected
to a line with an external switch or circuit breaker.
The protection elements, insulation switches and/or switches that are added
externally to the filter bank must be of a minimum size to withstand a current 1.5
times greater than what is indicated on the label
If an earth leakage protection relay for the filter bank is installed, its sensitivity and
trip delay must be adjustable.
•
For filter banks with equipped with a standard regulator measuring the current in a single
phase, we advise installing the current transformer (TC) in the phase connected to L1 (black
cable). The CT terminals S1 and S2 must be connected to the terminals with the same name
at the filter bank. For more details about the connection of the CT, see 5.3.5
5.3.3 Auxiliary control voltage.
•
Control circuits are defined as those related with the regulator's output relays and contactors
switching the filter's LC steps. These circuits are usually powered with an auxiliary voltage of
230VAC (the most common case) or in special cases can be powered with 110VAC (the later
is frequently used for 500V or 690V filter banks). There are two possible ways of feeding the
control circuitry.