888-2406-002
6-27
WARNING: Disconnect primary power prior to servicing.
Troubleshooting
6.12.2.1 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 PS1_HS_TEMP, Fault
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 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 the 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.
6.12.2.4 PS_PHS_LS, Phase Loss (100-120 Hz ripple)
When Phase Loss is detected the transmitter will mute for 20 seconds and then try to
restart. It will continue to do this until it is successful. For all 3 phase transmitters,
detection is based on the level of 100 to 120 Hz ripple at the output of a DSP band
pass filter (on the PS Controller) operating on the DC input voltage data. The DC
voltage samples are taken from the center taps of the WYE wound secondaries on
each supply (before the filtering). An excessive level of 100 or 120Hz (the
predominant ripple frequency should be 300 or 360Hz) is interpreted as an
indication of a transformer primary fault or line loss. The filter as a whole was
implemented in software via the microcontroller, hence not requiring any further
adjustment. Note that a major voltage imbalance between one or more phases could
also trigger this fault. This fault is not used in the single phase transmitter.
It is also important to note that there could be several other faults show up as a result
of a phase loss:
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PAC#_VOLTS
Summary of Contents for Platinum Z2 CD
Page 4: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 6: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 8: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 10: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 70: ...3 14 888 2406 002 WARNING Disconnect primary power prior to servicing Operator Guide ...
Page 130: ...4 60 888 2406 002 WARNING Disconnect primary power prior to servicing Overall System Theory ...
Page 194: ...6 38 888 2406 002 WARNING Disconnect primary power prior to servicing Troubleshooting ...
Page 196: ...7 2 888 2406 002 WARNING Disconnect primary power prior to servicing Parts List ...
