6.6. Troubleshooting
Please, see Section 5.4 Reading Auto-protection Signatures 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 latest 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) Next three symbols mean the following:
PN0 Tests made during POWER-ON procedure, before HV is ON;
PN2 Tests made during POWER-ON procedure, after HV is ON and one second after step-
start relay is closed;
SB0 Tests made in STANDBY mode, during the warm-up period or while entering
STANDBY mode (from OPERATE mode);
SB2 Tests made during STANBY mode, after the warm-up period;
PR0 Tests made while entering OPERATE mode;
PR2 Tests made during OPERATE mode;
TR0 Antenna relay tests made while changing from Tx to Rx (during OPERATE mode);
TR2 Antenna relay tests made while changing from Rx to Tx (during OPERATE mode);
TR4 Antenna relay tests made during Tx (OPERATE mode);
TR6 Antenna relay tests made during Rx (OPERATE mode).
c) The last symbol of the first group designates the kind of the input parameter that caused the
protection circuit to trip. The abbreviations in brackets below are the signal names/designations
according to the CONTROL PCB electrical schematic diagram and signal type (see the I-info note
below):
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 present on control grid (*GRIDRF, logic);
A RF power present in the antenna (*PANT, logic);
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