GB9221 series instruction manual
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◆ Overload：When the output power is more than 120% of the rated power and lasts
for 2s, the "overload"LED (yellow) will light up, and the "overload" fault occurs.The
main circuit will be cut off. Then the alarm sounded.
◆ Short：After the output short lasts for more than 0.5s, the "overload" LED
flashes. The main power supply will be cut off and alarm occurs.
◆ Mute：After the failure, the sound signal could be manually eliminated by the
mute button.
5）Monitor：The monitor speaker can be turned on/off by the [Monitor] button,
and a LED(green) indicates the monitor status.
6）Self-test:Press the [Self-test] button to start checking the indicator device
and the alarm device. After the check complete, it will automatically exit.
8 Common trouble shooting
fault
reason
solution
No response when
power on
1
Main&backup
power
connected OK?
1
Check
main
power
supply
voltage
and
standby
power
supply polarity
2
AC fuse OK?
2
Replace the same fuse
Over temperature
Over temperature because
running under heavy load
Reduce the output power, or use
after the temperature drops
Over voltage
Over
voltage
because
light load.
Reduce
the
output
amplitude
appropriately
and
adjust
the
volume knob
Overload or short
circuit
1
Output load shorted
2
External load exceeds
the rated capacity
1
Check the fixed voltage output
circuit
2
Reduce load
9 Points for attention
1) When in use, the casing of the machine should be grounded reliably and away
from strong interference sources, otherwise interference noise may be introduced.
2) When connecting the cable, pay attention to the positive and negative polarity
of the power supply and use the high quality copper core wire with the recommended
wire diameter.
3) The continuous on/off time interval should be greater than 10 seconds.
4) Please use the same specification fuse when replacing.Please tighten the seat
to prevent bad contact.
5）Parrallel connection is strictly prohibited on the output terminal.
10 Equipment models and parameter comparison table（table 1-1）
model
Rated
power
Backup power
input voltage
AC fuse
DC fuse
note
GB9221/500W
500W
48V
8A
25A
fuse ： Φ
