User's Guide _______________________________________________________________________
144 __________________________________________________________________ M211107EN-C
The +12 VOUT output pin can be used for powering external options
such as the obstruction light (FS11OBS) or the photo switch. The
maximum output current is 0.8 A.
The Pt100 and the humidity measurement inputs are not used in the
FS11P Present Weather Sensor application. If a Vaisala HMP45D probe
is connected to the inputs, T and RH are measured and the values are
shown in the status message but not used for anything.
AC (Mains) Power Supply
The AC (mains) power supply consists of the AC (mains) power circuit
breaker and fuses, Power Supply Board FSP103, and the AC (mains)
transformer. The power supply board includes the secondary fuses, the
AC (mains) voltage level selection switch, and the transient protection
circuitry. The operation of the AC (mains) power supply is indicated with
four LEDs. The green LED indicates that the raw nominal 24 VDC
power line voltage is OK. The three yellow LEDs indicate that the
28 VAC heater power line fuses are intact and output voltage is on for
each output.
The transient protection circuitry has been tested to sustain 2 kV level
transient surges generated according to the EN 61000-4-5 testing
standards. According to the test results, these surges should not effect the
operation of the circuitry. With higher level and repeated transient
surges, the high surge current will trip the Circuit Breaker. The circuit
board is thus protected against high surge currents and the unit is
operational after the Circuit Breaker is turned ON again.
For information on replacing fuses, see the corresponding section
Replacing Fuses on page 187.
Battery Backup
The optional battery backup ensures operation for a minimum period of
30 minutes (at 25 °C) in case of a power failure. If the unit is operating in
a non-freezing environment and the high power hood heaters are not
required, the FS11P sensor can also be operated with DC power. The
battery charger QBR101 also provides interfaces for solar panels and
larger external batteries. Refer to the QBR101 User's Guide for the
connections.
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