Comtech EF Data TRP500 - Manual (Page 68)

TRP500-4450 C-Band Outdoor Amplifier Revision 1
Appendix B MN-TRP500
B–2
B.1.4 Faults
The M&C system monitors certain key functions of the TRP500 for proper operation. Should any
of these parameters exceed predetermined limits, the M&C system will declare a fault. The
conditions that trigger a fault are:
• Any power supply more than ± 10% outside its nominal value.
• Fan less than 25% of maximum speed.
• I2C internal bus communications fault.
• Thermal Shutdown – A temperature fault is indicated if the unit is +>90°C. This creates
a summary fault and will cause the unit to mute itself and switch to the back-up unit (if in
a redundant system). However, the 10V supply to the FET transistors will remain on until
the unit reaches the thermal shutdown temperature of
≥ >95°C. For protection reasons,
the unit will shut down the 10V supply to the power transistors at temperatures >95 °C.
• High RF reflected power shutdown – When the reflected power reaches +52dBm the unit
will enable the mute, and switch off the amplifier bias voltage in order to prevent damage
to the unit.
• Firmware checksum error at power up.
• FPGA done indicator error at power up.
• Redundant waveguide switch position fault (applies to redundant mode operation only).
• Redundant inter-unit link fault (applies to redundant mode operation only).
The following parameters can be user defined to report an alarm condition, a fault condition, or
the parameter can be ignored completely by masking it:
• RF amplifier low output power (user adjustable value)
• High RF reflected power (user adjustable value)
B.1.5 Forward RF Power Detector
A power detector is provided to monitor the output power. It has a useful range of over 20 dB,
referenced to the unit’s rated P1dB point, and its value can be read by exercising the
RMS
command. The test data supplied with each unit gives an indication of the excellent accuracy and
flatness of the power monitor over the frequency band of operation.
B.1.6 Reverse RF Power Detector
A power detector is provided to monitor the reflected RF power. It has a useful range of over 20
dB, referenced to 52dBm (fault threshold value), and its value can be read by exercising the
RMS
command. The test data supplied with each unit gives an indication of the excellent accuracy and
flatness of the power monitor over the frequency band of operation.
B.1.7 Some Common Commands
A few of the most common commands and queries are listed below. Full details for each of these
are listed at the end of this section.