6-26 888-2408-002
WARNING: Disconnect primary power prior to servicing.
Troubleshooting
6.11.12 Combiner ISO Faults
There are two more ISO faults:
• PAC_ISOAz and PAC_ISOBz (2.5kW combiner ISO Resistors Az and Bz
located on the Isolation Boards). This is a temperature fault which is caused by an
imbalance between the outputs of the two foursomes on the respective Z Plane. If
one of these loads reaches 145°C the PA Controllers will mute all of the PAs. The
system can be reset by pressing an ON button. This fault will only show up if the
Master Controller is not operational or if the ISO APC Foldback routine initiated
by the Master Controller fails to reduce the temperature of the Iso load. The fold-
back description is in the Master Controller Faults under “System ISO Foldback."
• PAC_ISOAB(5kW combiner ISO load on the Hybrid). This is a temperature
fault which is caused by an imbalance between the outputs of Z Planes A and B.
If the temperature of this load reaches 145°C the PA Controllers will mute all of
the PAs. The temperature of these loads is also sensed by the Master Controller.
Therefore this fault should be preceded by a an ISO APC Foldback which will be
initiated by the Master Controller. The PA controllers will protect the system if
the Master Controller is not operational or if the foldback routine fails to reduce
the load temperature. The foldback description is in the Master Controller Faults
under “System ISO Foldback."
6.11.13 PAC#_REF, +5V Reference Fault
This fault means that the +5V reference voltage, which comes from the Life Support
Board and is common to all of the controller boards, is less than 4.6V. This voltage
is used as the reference for all system calibration. A change in this voltage would
cause major errors in system calibration and overload settings and is therefore a
critical fault. If only one of the PA Controllers has this fault, all PAs associated with
that board will be muted and switched out. This fault will show up in the fault log as
PAC1_REF or PAC2_REF.
6.11.14 PAC#_VOLTS, Power Supply Fault
This fault is activated if the supply voltage to the PAs under the control of an
individual PA Controller is under 30Vdc or over 65Vdc. Initiates a 3 strike
sequence. If fault remains, all PAs under that controller (and power supply) will be
muted and switched out. Remember that all 8 PAs controlled by PA Controller 1 are
fed from Power Supply 1 and PA Controller 2 is associated with the same PAs as
Power Supply 2.
NOTE:
A severe AC phase imbalance or complete loss of phase could trigger this
fault. If an AC phase loss fault is logged at approximately the same time, then
this fault should be ignored.
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