6-30 888-2408-002
WARNING: Disconnect primary power prior to servicing.
Troubleshooting
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:
• PAC#_VOLTS
• IPA_LOW
• EXC#_AFC
These faults are incidental and simply occur due to the timing of when the phase
loss occurs and which components see it first.
6.12.2.5 PSC#+20V, Fault
+20 Volts supply fault. Since this voltage is very important for the operation of the
controller (without it no analog reading can be carried out) it is continuously
monitored by the watchdog IC (MAX 705). If it is below 12 volts the fault is
tripped. Troubleshooting will require tracing the +20Vdc back to the Low Voltage
Supply to find out where it is being lost.
6.12.2.6 PS#_CONFIG, Configuration Fault
The controller is continuously checking the configuration, meaning the number of
supplies connected and their identification numbers (ID), as part of this process a
check of the valid configurations is also carried out, not allowing any power supply
number above 4 or two equal ID numbers. The Supply number is set by jumpers
JP1, JP2 and JP3 on the Rectifier Boards as follows:
Power Supply ID Chart
PS #1 PS #2
JP1 IN OUT
JP2 OUT IN
JP3 OUT OUT
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