Advantech SSPB-3000C, Installation And Operation Manual, Page: 13 / 55

SSBP-3000C
Page 12
3.5.1 F
AULT
D
ETECTION AND
I
NDICATION
The unit will automatically go into a shutdown mode and send a message to all of the external
interfaces when any one of the following occurs:
1. The local oscillator within an up-converter module is out of lock.
2. The hotspot temperature exceeds 85
°
C.
3. Any of the GaAs FET devices fails.
The SSPB continually monitors the internal temperature and the current consumption. It also has
an automatic shutdown feature to prevent operation at excessive temperatures. The unit will
automatically restart when the hotspot temperature falls below 65°C.
A thermal alarm may result from any one of the following conditions:
1. High ambient temperature (SSPB is designed to operate between 0
°
C and + 50 °C ambient).
2. Blockage at the air intake or exhaust vents.
3.5.2 MUTE C
ONTROL
The user can disable the RF output power remotely by:
1. Leaving unconnected pins 1 and 5 of the RELAY Interface connector.
2. Sending a mute command in terminal mode through the RS-232 interface.
3. Sending a mute command in packet mode through the RS-485 interface.
This feature is useful if the user wishes to perform a maintenance check or to check out the
transmission system.
3.6 POWER SUPPLY SYSTEM
The
Power Supply System has one input: 180-264 VAC. The power supply provides a +12 VDC
high current output to the following modules via relay K1 and the ON/OFF switch (see Figure 2 at
page 14):
1. Power amplifier module,
2. L/C-Band up-converter module,
3. Secondary power supply,
4. Varifan power supply,
5. 10 MHz oscillator,
6. Redundancy waveguide switch, (if working in the redundancy mode) and