CIRCUTOR computer MAX f Series - Manual (Page 11)

M066B01-03-15A computer MAX 6f 12Vdc
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4.2 Unit installation
4.2.1 Mechanical Installation
In mechanical terms, the unit is installed on the front panel of a cabinet or on a panel. The panel fixing
drill must be drilled in compliance with DIN 43 700, (dimensions: 138
+1x
x138
+1
mm).
4.2.2 Connections
The following points must be checked before the unit is powered:
The installation and maintenance of the unit must be performed by qualified and authorised
staff, in accordance with the national and international Standards.
All connections must remain inside the electric panel.
Take into account that when the unit is connected, the terminals may be hazardous to the
touch, and opening the covers or removing elements may expose these parts. Do not use
the unit until its installation is completed.
This regulator has a series of associated capacitor banks that remain charged up to 5
minutes after the unit has been disconnected from the mains. Make sure that all capacitors
have been discharged before handling the unit.
The installation of an external current transformer (CT) is necessary to measure the current.
Usually, the transformation ratio of this CT is In/5 A, where In must be a minimum of 1.5 times
over the total maximum current of the load.
The current transformer (CT) must be installed on the distribution panel where all of the load
currents circulate and where the current of the capacitors will be compensated (see Fig. 4.1)
The current transformer (CT) should preferably be connected to phase L1, while the voltage
connections should be connected to phases L2 and L3 (see diagrams in Fig. 4.2 and 4.3).
Connections P1, P2, S1 and S2 shown on the said diagrams must be respected. If the
connection layout mentioned above is not respected, the phase must be adjusted, following the
procedure in section 5.1.7.
CORRECT INCORRECT
The current transformers (CT)
must measure the combined
current of the capacitors and
the loads
If this does not work, make
sure that the CT is not short-
circuited.
When the CT is connected in this
position, NO CAPACITORS WILL
BE CONNECTED, even when
inductive loads are present. The
unit does not perform the
compensation functions.
When the CT is connected in this
position, ALL CAPACITORS WILL
BE CONNECTED. However, they
will not be disconnected when the
load decreases.
Risk of overcompensation in the
network with no load
Fig. 4.1.- Location of the current transformer