888-2408-002
6-29
WARNING: Disconnect primary power prior to servicing.
Troubleshooting
NOTE:
Since one power supply controller is able to control up to two power supplies,
one of the power supplies can be turned off, due to a fault, while the other one
continues to operate normally. Due to the distribution of voltage to the PAs,
this will affect all of the PAs associated with one of the PA Controllers.
Therefore the effect is the same as the loss of a PA Controller and the trans-
mitter will have a maximum power output of about 33% of nominal.
6.12.2.1 PS#_START, Soft Start Circuit Fault
This fault is tripped, and the power supply shut off, if the PA voltage does not reach
a minimum of 40 volts within 3 seconds (5 seconds for a single phase supply) of
activating the softstart circuit. This prevents the SCR’s (other than the soft start
SCR’s) from attempting to charge a partially (or perhaps completely) discharged
capacitor which would overload the fuses. The most likely cause would be an open
soft start/Discharge resistor or failed SCRs and/or SCR fuses.
6.12.2.2 PS#_HS_TEMP, Rectifier Heatsink Temperature
There is a thermistor, temperature sensor, mounted on each of the rectifier heat sinks
(on top of the transformer). This fault is triggered if the temperature of the rectifier
heatsink exceeds 100°C. If one of the thermistors or its wiring is shorted the
temperature indication will be about 155°C or higher and will not change. To
monitor the heatsink temperature on the Diagnostics Display press [METERING
C,D,A]. This screen gives the heatsink temperature of each power supply.
6.12.2.3 PS#_DSCHG, Discharge circuit fault
If during the operation of the supply the discharge circuit becomes active, due to a
malfunction, this fault is triggered preventing the supply from discharge and charge
at the same time. During normal operation the voltage at the soft start resistor
(which is also used for discharge) must be very close to 0 Volts. This voltage, called
DISCHARGE SAMPLE, is monitored by comparator U1 on the PS Controller
board and will trigger the fault if the voltage is not low enough. The most likely
cause is a failure of the discharge FETs on the Rectifier Board or an open discharge
resistor.
Summary of Contents for Z5 CD
Page 4: ...888 2408 002 WARNING Disconnect primary power prior to servicing...
Page 6: ...888 2408 002 WARNING Disconnect primary power prior to servicing...
Page 8: ...888 2408 002 WARNING Disconnect primary power prior to servicing...
Page 10: ...888 2408 002 WARNING Disconnect primary power prior to servicing...
Page 192: ...6 40 888 2408 002 WARNING Disconnect primary power prior to servicing Troubleshooting...
Page 194: ...7 2 888 2408 002 WARNING Disconnect primary power prior to servicing Parts List...
