Hitachi EC702HP Operation Manual page 135

Section 5 - System Operation Manual
(E-Compact ATSC Transmitters - EC701HP thru EC708HP)
System Alarms
ALARM MESSAGE
Drawer Comm. !
Too Few Drawers!
Reduced Power !
Reflected Power !
RF Load Fan F ail
Power Amp. OFF!
Other Exciter Fail!
Manual Rev. 0.0 - August 2016
ALARM DESCRIPTION
At least one drawer is not
communicating with the Exciter
Indication that the transmitter
does not have enough RF
Power Drawers to operate at the
minimum reduction power level.
Indication that the transmitter
is not operating at the nominal
power. At least one RF Power
Drawer is not contribuiting .
Reflected power is present at
the RF output of the transmitter.
It indicates failure of one or
more fans loads drawer or the
temperature of the drawer is
greater than 90°C
The POWER ON/OFF switch is
set on the OFF position. Green
Switch locates on the bottom
part of the front panel of the
transmitter cabinet.
Indicates failure in the
communication between
exciters A an d B.
ACTION THAT FOLLOWS
 Check the physical connection on the RS485
cabling. These connections are located on the
Exciter rear panel, green connector. On the
other end, at the rear panel of the RF Power
Drawers, DB-15 connector.
 Using the Hyper-Terminal, check the
parameters on the RF Power Module.
 Get in contact with Hitachi Kokusai Linear's
technical support service.
 Check the presence of 208Vac on each RF
Power Drawer.
 Check the IRUSH circuit and/or the interlock.
 Check the physical connection on the RS485
connector (DB-15). These connections are
located on the RF Power Drawer rear panel. The
cables connect the RF Power Drawer to the
Exciter.
 Get in contact with Hitachi Kokusai Linear's
technical support service.
 Check the physical connection on the RS485
cabling. These connections are located on the
Exciter read panel, green connector.
 Get in contact with Hitachi Kokusai Linear's
technical support service.
 Check other alarms status that can help for a
better diagnostic.
 Check the RF Power passives connections,
looking for overheating on potential bad
contacts on the transmission line.
 Get in contact with Hitachi Kokusai Linear's
technical support service.
 Check the mains power connection of the tail
fan module. This is located at the rear of the
loads drawer. Switch fan module or if
appropriate only the damaged fan.
 Check the temperature of the drawer.
 Note: The equipment may work temporarily
in the presence of this alarm, noting that it is
responsible for cooling the load unbalance.
 Check if the Green Switch (POWER ON/OFF
Switch) is OFF.
 Check interlock.
 Get in contact with Hitachi Kokusai Linear's
technical support service.
 Check the communication between the
exciters in the CONTROL I/O connector in the
exciters' rear panel.
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