50
SALICRU
8. OPTIONS
8.1. INTERNAL MANUAL BYPASS.
The manual bypass is an option that allows the load to be
powered from the UPS or directly from the commercial mains
supply.
If the UPS has an isolation transformer connected in its output
or in the static bypass line, the manual bypass board must also
have a transformer, in order to maintain a common neutral con-
nection. The optional isolation transformer provides galvanic
isolation between the primary and secondary windings, and
this greatly attenuates electrical noise and transients from the
mains, and also reduces their transfer to the secondary.
The manual bypass board is a make-before-break type, and so
does not cause any interruption in the supply to the load when
it is switched, unless it is operated in a different order to that
specified.
If the contactor includes “backfeed protection” inside
the switch board, it must be remembered that its opera-
tion is automatic and requires no attention except in the excep-
tional circumstance of one of its protection fuses tripping. Do
not manipulate disconnector with backfeed protection fuses,
except when replacing one of these protection elements.
As can be seen in
to
, SLC ADAPT2 devices can optionally
be equipped with an Internal Manual Bypass for maintenance
operations, with an independent Bypass line.
Externally, the devices are equipped with additional connec-
tion terminals at the back, for the independent Bypass line, and
have a manual bypass disconnector on the front, as shown in
,
below:
Manual Bypass
disconnector
Independent
bypass terminals
Fig. 36. Manual Bypass disconnector and terminals.
8.2. AMBIENT TEMPERATURE SENSOR.
This is a sensor that incorporates a resistance of R = 5k with
B25 / 50 = 3275 K ± 1% to display the ambient temperature on
the screen.
shows the connection pin out of the terminal block located on
the connector block of the digital inputs and dry relay contacts
for the temperature sensors.
The room sensor connects to J3.
TBAT
TAMB
TEMP_BAT
TEMP_ENV
Fig. 37.
Terminal block connections for sensors.
