Installation manual

MNC-0400-001 49 of 54 REV H
Operation, Rack and Digital HPAs
Fault Mode
This mode exists anytime a condition detrimental to the TWT is
detected by the power supply fault detection circuitry. Faults are
indicated on the front panel by red LEDs. Any of the following
conditions trip the fault detection circuitry:
Excessive Helix Current Fault—(Latched) When the power
supply detects a Helix Current fault, it turns OFF high voltage
and then tries to turn the high voltage ON. If the fault persists for
three OFF/ON cycles, the fault circuit latches and the power
supply stops automatically recycling.
Voltage Fault—A Voltage fault will latch immediately when a fault
occurs. A Voltage Fault indicates a problem in activation of the
high voltage system.
TWT Over-Temperature Fault—A TWT over-temperature fault
will clear itself once the temperature of the TWT's collector is
reduced to a safe operating level. High voltage will automatically
be enabled when the overtemperature fault clears (if high
voltage ON has been selected).
Note
An over-temperature fault should be cause for immediate
maintenance action as it is an indication of a fan failure or blocked air
passage(s).
WARNING
ELECTRIC SHOCK HAZARD because there is high
voltage on various terminals inside the equipment. Turn
OFF the equipment before removing lid. Failure to
comply could result in serious injury or death to
personnel.
WARNUNG
GEFAHR VON ELEKTRISCHEN SCHLÄGEN wegen
Hochspannung auf verschiedenen Terminals innerhalb
des Gerätes. Stellen Sie das Gerät AUS bevor Sie den
Deckel abnehmen. Nichtbefolgen könnte die schwere
Verletzung oder den Tod von Menschen zur Folge
haben.
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