--
ANALYZER OF THE QUALITY OF ELECTRIC POWER SUPPLY
QNA-303 --
Page
10
5.1.1.- Selecting the connection mode (3 wires / 4 wires)
The arrangement of the distribution system to be monitored by the
QNA-303
can be selected by means of an inner bridge placed inside the
QNA-303
casing.
Thus, the
QNA-303
will perform the analysis of the voltage incidences
according to the position of this bridge, that is, voltage events will be detected
between phase and neutral for the 4-wire arrangement, and, on the other side, these
events will be detected over line-to-line voltages for the 3-wire arrangement.
To change the position of the bridge, first of all check that the
QNA-303
is
completely disconnected from the monitored main (both power supply and measuring
circuits), and then remove the frontal cover of the
QNA-303
. Verify that the position
of the bridge agrees with the desired system arrangement.
Finally, set also the selected configuration in the PC software, since
both settings must always fully coincide.
4-wire configuration
3-wire configuration:
Connector position:
Up
Connector position:
Down
Connector position:
Up (J1)
Connector position:
Down (J4)
5.1.2.- Selecting the supply voltage
The supply voltage of the
QNA-303
for any particular application can be
selected by means of an inner bridge placed inside the
QNA-303
casing.
First of all, check that the
QNA-303
is completely disconnected from the
monitored main (both power supply and measuring circuits), and then remove the
frontal cover of the
QNA-303
. Verify that the position of the bridge agrees with the
desired voltage supply.
Power supply:
230 V~
Connector position:
Up
Power supply:
400 V
Connector position:
Down
