User's Manual

-26 -
１１ P rotection Circuit
1.8MHz AUT-CIV ANT-A
PROT CROWBAR
Protection Sign
11-C Protection / Slight Fault
Sign Status
PROT lamp glows.
Message is displayed
Main DC P. Supply (Vdd)
）
On
AC Magnet Relay ON
RF Path Thru
FAN
・
Control Circuit ON
Reset
Switch “OPERATE/STBY” off and on.
List of PROT
Prot. LCD Sign Description Re-adjust ALC
Over Out
put Power
PROT OVER POWER RF output power exceeded 1,500W Re-adjust ALC
Inhibit Freq. PROT INHIBIT FREQ CB band freq.(26,000
～
27,999MHz)
detected
Check x-ceiver
Reflected
Power
PROT OVER Pr Power reflection from antenna
exceeded 150W
Check antenna
Over
Current
PROT OVER CURRENT FET drain current (Id) exceeded 70A Check antenna
Re-adjust ALC
Over
Dissipation
PROT OVER Ploss FET drain dissipation (Pd) exceeded
2,000W
Tj Over PROT OVER Tj FET junction temperature exceeded
190
℃
Over Drive PROT OVER DRIVE RF drive power exceeded 150W Readjust ALC,
decrease RF drive
from X-ceiverf
Unbalance PROT COMB HEAT PA combiner temperature exceeded
70
℃
Check antenna
SWR
Contact factory
＊
Crowbar PROT CROWBAR Crowbar prot. Circuit switched on See below
Band Mis-
set
PROT BAND MIS-SET Band set incorrect., PA failed Check band setting
Contact factory
P
OWER OPER.
M
ETER
P
r
VD ALC
O
FF STBY
BAND
AUTO
M
AN’L
ON AIR
FAN
ID
P
ROT
P
f/kW
HF SOLID STATE LINEAR AMPLIFIER HL-
2
500FX
MAN’L
1.8
3
.5
7
10
1
4
1
8/21
24/28
5
0
Pr/VD/ID/A
L
C
O
UTPUT
H
I
L
O
A
NT
A
B
ID
Another group of protection circuits are provided to shut down the transmission when the other faults
occur within the amp.