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9.
PROTECTIONS / ALARMS
The SPE 1K-FA has a sophisticated protection system that constantly controls the
amplifier's most important parameters.
These parameters are:
Temperature of the heatsink; max. / min. voltage on the PA; max. PA current; SWR;
reflected power; max voltage RF on the tuner; input power; power combiner balance.
NOTE: Unlike all the other linear amplifiers that measure only the reflected power of the
antenna, to guarantee a greater protection of the PA, the SPE amplifier measures also
the power of harmonics reflected by the band-pass filter.
NOTE: To guarantee the maximum efficiency with the same output power, the PA has three
MRF150 push-pull amplifiers connected through a combiner.
NOTE: Temperature measurement is used also to control fan speed. The thresholds where the
speed changes may be changed from NORMAL (default) or CONTEST (See the
"Programming" chapter of this manual).
The protection system is effected in two different ways:
1)
Through hardware circuits to guarantee minimum intervention time.
2)
Through software, with one of the two CPU's, to guarantee the maximum
precision.
The two results are always compared, every difference produces a protection trip and
consequent alarm.
There are three types of protections/alarms:
a) SIMPLE
b) SERIOUS
c) FATAL
NOTE: It is possibile to read the alarms file log in the standby state using the [DISPLAY] key.
To reset the alarm file log press the [TUNE] and [OPERATE] keys together.
NOTE: If the acoustic alarm is very frequent during transmission, the possible causes should
be investigated.
User's manual
This is the most common case. An acoustic warning beep
sounds, but no operator intervention is required, as the control
system automatically restores the correct operating conditions.
When automatic system recovery is not possible (e.g. the
temperature climbs over the limits due to obstruction of the fans,
SWR is too high, etc.). In this case the amplifier switches into
standby state and the alarm is stored. Normally transmission can
continue with the exciter only.
If the amplifier is in the b) situation but the CPU is faulty or it isn't
able to operate, the amplifier is turned OFF with no other
warning. To restart the amplifier, the main switch in the rear
panel has to be set first to [O], and then to the [I] position
Pag. 17 of 42
EXPERT 1K-FA
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