3.2.- INSTALLATION
The Controller MASTER control VAR FAST regulator is connected to units that
contain capacitors, which remain charged after the voltage source is disconnect-
ed. Wait at least 5 minutes after the unit is disconnected before handling its
internal components in order to avoid the risk of electric shock.
Any manipulation or use of the unit other than that specied by the manu-
facturer may compromise user safety�
Make sure that the units are correctly earthed before they are connected. A faulty earth connec-
tion could lead to faulty operation and lead to a risk of electrical shock for the user or person
handling the unit.
Resonance can occur when the unit is connected with no load. In this case, the voltage har-
monics can be amplied, causing damage to the compensation unit and other units connected
to the mains.
The safe use of the Controller MASTER control VAR FAST requires the persons installing
or handling it to follow the general safety measures of LV electrical installations, as well as the
warnings indicated in this instruction manual.
The unit will be installed on a panel (138+1
x 138+1 mm panel drill hole, in compliance with DIN
43700). All connections are inside the electric panel.
Terminals, opening roofs or removing elements can expose parts that are haz-
ardous to the touch while the unit is powered. Do not use the unit until it is fully
installed.
The unit must be connected to a power circuit that is protected with gl (IEC 269) or M type fuses
with a rating of 0.5 to 2 A. It must be tted with a circuit breaker or equivalent device for discon-
necting the unit from the power supply mains.
The power and voltage measurement circuits as well as the relay contact circuits must be con-
nected with cables that have a minimum cross-section of 1.5 mm
2
.
One or three external current transformers (CT) need to be installed in order to measure cur-
rent. Usually, the transformation ratio of these CTs is In/5 A, where In is at least 1.5 times the
total maximum load current.
The secondary cables of the current transformers (CT) must have a minimum cross-section
of 2.5 mm
2
. For distances between the CTs and the unit of more than 25 m, this cross-section
should be increased by 1 mm
2
for every 10 m.
The current transformers (CT) must be installed at a point in the distribution panel which carries
all the current of the loads to be compensated as well as the current of the capacitors them-
selves ( Figure 1).
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