Specifications

M.5.7.4 Fault Enables
During the Step Start Sequence when most transmitter circuits
have not yet reached their steady state condition, some fault
inputs must be ignored.
Faults that are active all of the time and that the Controller can
immediately respond to are:
PS.PE.X
C.UL.X
P. S .O C . X
I.EXT.X
I.DOOR.X
Other faults are responded to only when Enable inputs are present.
M.5.7.5 Enable 1 Input
Faults that are active only when Enable 1 is present are:
E.SF
E.CI
M.5.7.6 Enable 2 Input
Faults that are active only when Enable 2 is present are:
OT.OFF.X
AF.FLT.X
DR.OD.X
P. S .V E . X
M.5.7.7 Manual Fault Switches
The Manual Fault Switches can be used to test the Controller
response to these three types of faults.
When the Manual A/C Restart switch S3 is depressed and held
down, the transmitter will shut OFF and remain that way. When
the switch is released, the transmitter will automatically return
to the same power level as before the switch was depressed.
WhentheManualOverloadFaultswitchS4isdepressedand
held down, the transmitter will shut off and remain that way.
When the switch is released, the transmitter will automatically
return to the same power level as before the switch was de-
pressed. If the switch is depressed once more within 5.5 seconds,
the transmitter will shut OFF and remain OFF.
When the Manual Fault Off switch S2 is depressed the transmit-
ter will shut OFF and remain OFF even after S2 is released.
M.5.7.8 I.EXT.A and I.DOOR.A Outputs
These outputs are connected to the Fault LED Latching circuits.
M.5.8
Fault Handling - FLT1 and FTIM
The FLT1 (Fault 1) PAL accepts the FOFF, FACR, and FOVR faults
from FGATE2 and the Foldback Limit from the FLDBK PAL.
It responds to these faults by controlling the Enable Turn-On
Request that is sent to the LR PAL. ENTOR signals the LR PAL
that no inhibitive faults are present. Conversely, loss of ENTOR
recoverably faults the transmitter OFF.
It is the source of the FLT Master Reset that is connected to most
PALs. It will halt all PAL activity and clear them to an off or
ready state.
The FTIM (Fault Timing) PAL gives the timing sequence of
events for the FLT1 PAL. TAC and TOV are timeout signals for
FACR and FOVR recovery respectively. These signals are sent
back to the FLT1 PAL to indicate fault timeouts.
Refer to Figure M-8, FLT 1 and FTIM PALs.
M.5.8.1 A/C Restart Handling
FACR triggers an immediate, fully recovering, shutdown of the
transmitter by canceling the ENTOR signal.
Loss of ENTOR to the LR PAL cancels the TOR output from
LR PAL to the PWR PAL. It does not assert FLT, allowing PALs
to retain memory of operation mode. In particular, OPR retains
the coarse power level selection.
AC1 and AC0 provide fault status from the A/C Restart Fault
Handling in the FLT 1 PAL to the 160mS A/C Restart Timer in
the FTIM PAL. The TAC output of this timer is sent back to the
FLT 1 PAL.
When the FACR input goes low, the Mute Request output goes
low and the AC0 output will go high.
One clock cycle (250 uS) later, the ENTOR output will go low
and the AC1 output goes high.
When both AC0 and AC1 outputs are high, the 160mS A/C
Restart Timer is started and 160mS later the TAC output will go
high for 250 uS. The AC0 output will go back low at the end of
the TAC pulse.
If the FACR input is not low at this time, 250 uS later the Mute
Request and ENTOR lines will go high and the AC1 output will
go low. This will generate a new TOR and the transmitter will
return to operation.
If the FACR input is still low at this time, the outputs will remain
in this state. When the input does go back high (up to four days
with battery backup installed), 250 uS later the Mute Request
and ENTOR lines will go high and the AC1 output will go low.
This will generate a new TOR and the transmitter will return to
operation.
Upon reoccurrence, this fault is not upgraded to an FOFF. An
FACR will co-exist with an in progress FOVR, each will recover
according to its own timing and requirements.
M.5.8.2 Overload Fault Handling
FOVR triggers an immediate, fully recovering, shutdown of the
transmitter by canceling the ENTOR signal.
Loss of ENTOR to the LR PAL cancels the TOR output from
LR PAL to the PWR PAL. It does not assert FLT, allowing PALs
to retain memory of operation mode. In particular, OPR retains
the coarse power level selection.
OV1 and OV0 provide fault status from the Overload Fault
Handling in the FLT 1 PAL to the 160mS Overload Restart
Timer in the FTIM PAL. The TOV output of this timer is sent
back to the FLT 1 PAL.
When the FOVR input goes low, the Mute Request and ENTOR
outputs will immediately go low and the AC1 output goes high.
M-8 888-2339-002
WARNING: Disconnect primary power prior to servicing.