USER'S GUIDE ____________________________________________________________________
108 __________________________________________________________________ M211187EN-C
Communication Controller Board FSC202
Communication Controller Board FSC202 contains all external
communication interfaces. The FSC202 board polls the Measurement
unit FSM102 and Background Luminance Sensor LM21 through the
internal RS-485 sensor bus and combines and forms the FS11 data
message from their response messages. The available data line options
are the serial lines RS-232 and (external) RS-485. FSC202 also includes
a separate RS-232 maintenance line.
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 FS11
Visibility 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 the placement of fuses, see Figure 59 on page 157.
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