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5. Troubleshooting
See S.5-3 for the method of reading the auto-protection signatures. You can decode them using the
information below.* The signatures are structured in two lines, three groups by six symbols for every one
event of auto-protection. The last event is numbered as 1A-1B pair of lines, and the oldest one is 7A-7B.
The meaning of the first group is as follows:
a) nA - the number of the trip;
b) The next three symbols mean the following:
PN0 - tests made during Power-On procedure, before HV is ON;
PN2 - tests made during Power-On procedure, 1 second after HV is ON the step-start relay is closed;
SB0 - tests made in standby, during the warm-up period and while entering standby (from operate);
SB2 - tests made during standby (after the warm-up period);
PR0 - tests made while entering operate;
PR2 - tests made during operate;
TR0 - antenna relay tests made while changing from Tx to Rx (releasing the relay during operate)
TR2 - antenna relay tests made while changing from Rx to Tx (closing the relay during operate)
TR4 - antenna relay tests made during Tx (relay should be closed in operate mode)
TR6 - antenna relay tests made during Rx (relay should be open in operate mode)
c) The last symbol of the first group designates the kind of the input parameter, which caused the protection
to trip. The abbreviations in brackets below are the signal names/designations according to the CONTROL
PCB electrical schematic diagram and signal type:
1 - peak forward power (pfwd, analogue)
2 - reflected power (rfl, analogue)
3 - input (drive) power (inp, analogue)
4 - peak anode alternate voltage (paav, analogue)
5 - screen grid current (g2c, analogue)
6 - plate current (ipm, analogue)
7 - high voltage (hvm, analogue)
8 - exhaust air temperature (temp, analogue)
9 - drive power exists (*GRIDRF, logic)
A - antenna power exists (*PANT, logic)
B - output relay closed (ORC, logic)
C - arc fault (ARCF, logic)
D - control grid current too high (G1C, logic)
E - +24VDC power supply error (PSE, logic)
F - low airflow (LAIR, logic)
For instance, "1ASB07" in the first group would mean that the last auto-protection (1A) tripped by the tests
made in standby (SB), during the warm-up period (0), and the high voltage - hvm signal was failing (7).
The next five groups of symbols carry information about the analogue and logic values as measured by the
micro-controller (at the moment of auto-protection trip).
* Additional information is available from ACOM or from your dealer on how to interpret these values. Using
an EXCEL APPLICATION (available from ACOM or your dealer free of charge) and a PC, you can decode
these signatures easily by yourself. For instance, in the above example you could see what the value of HV
was at the moment when it has failed (it could be a too low or too high voltage which has tripped the
protection).
C A U T I O N
In case it is necessary to ship the amplifier please see S.7-3
.
