TB8100 Service Kit User’s Manual Operational Information 77
DC-DC converter The box in the DC-DC converter submodule indicates the current power
saving mode.
Standby converter The LED in the Standby converter submodule indicates the state of the DC
supply to the standby converter. This submodule operates only when the PMU
enters deep sleep mode, in which it provides power only to the reciter.
Output switch There are three arrows going into the output switch. The one that is not
disabled indicates which converter is currently providing power
PA The PA LED displays green if the PMU is supplying power to the PA and gray
if it is not. When the PMU is using mains power, it always supplies power to
the PA. When it is using battery power, it supplies power unless it is in sleep
mode and using the standby converter.
Reciter/control
panel
The Reciter/control panel LED indicates the status of the power supply to the
receiver and the control panel. Green means that it is supplying power. Gray
means that it is not, because the PMU is in battery protect mode.
Auxiliary output The Auxiliary output submodule has an LED that indicates the status of the
auxiliary power or battery charging output.
The submodule label indicates the voltage that the auxiliary power submodule
is designed to produce (12, 24, or 48 V).
Output Current The Output Current gauge shows how much current the PMU is supplying to
the rest of the subrack.
Mode Description
Normal mode The PMU is operating normally.
Sleep mode The PMU is in hysteresis mode.
Deep Sleep
mode
The DC-DC converter is off and no power is being
provided to the PA.
LED Text Description
Green On The standby DC supply has been turned on. The PMU is
providing only 10 W of power to the exciter.
Red Off Battery voltage is too low or too high.
Gray Off No standby battery power supply is fitted.
LED Text Description
Green On The auxiliary power output has been turned on.
Red Off There is a fault. This could be because there has been a
current overdraw and the fuse is blown. On cooling, the
fuse will automatically reset.
Gray Off No auxiliary power supply unit is fitted or the PMU has
turned the output off.
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