Comtech EF Data HPCST-5000 - Manual (Page 204)

External Connections High-Power C-Band Satellite Terminal
2–10 Rev. 0
2.1.2.7 Alarm/Interface Board
The Alarm/Interface board provides:
# Status indicator by Form-C relay contacts:
! Fault
! Alarm
! High reflected power (HRP)
! RF mute
! Output power level monitoring
# Mute mode which may be asserted by a remote current mode MUTE signal. A
current rating of 20 mA may be a MUTE or ENABLE signal.
# Reset the HRP latch by remote current mode RESET signal. A current rating of
20 mA may reset the HRP latch if this condition occurred.
# The alarm/interface board is connected to the microwave power amplifier and to
the customer’s interface.
The Alarm/Interface board receives the analog signal from the reflected power sensor.
The power amplifier will be muted when the input voltage is above the threshold level
(with 1 second delay). When this event has occurred, HRP relay is de-energized and its
Normal Close contact will become OPEN. It will indicate the fault condition on the
customer interface.
Power up returns the system to the active condition if the amplifier is in the normal
condition. The threshold level is set for VSWR of 2:1 maximum.
WARNING
Prolonged operation without a load at the output may cause severe bodily
harm. Do not operate the unit if the RF output is not connected to a load.