7
2.5
Control outputs (optional)
Each of the two factory fitted optional control outputs
is a galvanically isolated single pole solid state
switch as shown in Fig 3. The outputs are polarised
and current will only flow in one direction. Terminals
A1 and A3 should be connected to the positive side
of the supply.
Note:
Because of the series protection diode some
test meters may not detect a closed alarm output.
Fig 3 Equivalent circuit of each control output
The solid state output of each control output may be
used to switch any dc circuit with parameters of:
V max
=
30V
I max
=
200mA
Fig 4 Typical control output application
3.
INSTALLATION
3.1
Location
The BA578E has a robust glass reinforced Noryl
enclosure with a toughened glass window. The front
has IP66 ingress protection and a gasket seals the
joint between the instrument enclosure and the
panel, the rear of the instrument has IP20 ingress
protection.
The BA578E may be installed in any panel providing
that the operating temperature is between -40°C and
+70°C.
At temperatures below -20°C the display
digits will change more slowly and the contrast will
be reduced, but the instrument will continue to
function
Fig 5 shows the overall dimensions of the instrument
together with the recommended panel cut-out
dimensions. To achieve an IP66 seal between the
instrument enclosure and the instrument panel the
smaller tolerance aperture must be used, and the
instrument must be secured with four panel
mounting clamps.
Although the front of the BA578E has IP66
protection it should be shielded from continuous
direct sunlight and severe weather conditions.
3.2
EMC
The BA578E complies with the requirements of the
European EMC Directive 2014/30/EU. For specified
immunity all wiring should be in screened twisted
pairs, with the screens earthed at one point.
