User's Manual

19
11. Protection & Safety Circuits
11-1 Protection Circuits
HL-2.5KFX is equipped with ten protection circuits as shown in the table below.
Protections are commanded by the 16bit microprocessor chip, and DC drain
voltage (120 V) is cut off, when the protection circuit works. Also PROT lamp is lit
and the amplifier becomes “through” state.
If PROT lamp is blinking, you may reset the shut down with OPER/STBY
switch. Reason for the shut down is displayed on LCD panel except for some
cases.
For OVER VDD and OVER TEMP shut downs, turn the AC Power switch off
and on to reset the amplifier.
No. PROTECTION LCD DISPLAY CONDITION RESET REMARKS
1 Over drive PROT OVER DRIV
Drive exceeded 120 W
*1
OPER
2 Band mis-set PROT BAND-MISS
Amp gain is less than five times
*1
OPER
Or when amp out of
order
3 Over current PROT OVER ID
ID (drain) exceeded 35 A
*1
OPER
4 Freq. Inhibit PROT INHBT FREQ
Driven freq-ranged 26 to28 MHz
*1
OPER
FCC rule
5 Over P
F
PROT OVER Pf
Output power exceeded 1550 W
*1
OPER
6 Over PR PROT OVER Pr
Reflected power exceeded W
*1
OPER
7 Over Dissipation PROT OVER Plos
Drain power dissipation exceeded
2000 W
*1
OPER
Theoretical
8 Over Tj PROT OVER Tj
Functon temp. reached 190℃
*1
OPER
Theoretical calculation
9 Over voltage PROT OVER VDD
Drain voltage exceeded 140 V
*2
AC POWER
10 Over heat PROT OVER TEMP
Heat sink temp reached 90℃
*2
AC POWER
11 Fuse blown PROT FUSE-BLOW
Fuse was blown
(F1, F2 of Unit 10)
Not resettable
Check Fan Control
Unit, Unit 10
*1: Reset OPER/STBY switch.
*2: Reset AC main POWER switch.
←Example of LCD display
(In this case, over drive)