SANJIANG GB9221 Series User manual

Please read this instruction manual
before installation and use
GB9221 series fire alarm
broadcast amplifier
Instruction manual
【suitable for 150W/300W/500W】
2017/1.0
1 Overview
1） GB9221 series fire alarm broadcast amplifiers are an extension device for

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emergency broadcast at fire or other accident scenes.In the field of fire broadcast,
GB9221 must be used with the GB9242(Fire Broadcasting Host)to complete the fire
broadcast. Background music broadcast can be directly played by external input source
signals (such as CD/MP3 player, tuner, etc.) when there’s no accident event.
2） The display of GB9221 series fire alarm broadcast amplifiers is built-in LED
indicator lights.These built-in LED indicator lights can indicate various operating
conditions and fault conditions.All the functions can be set up with light touch
buttons.
3 ） GB9221 series fire alarm broadcast amplifiers only contain the power
amplification section of the GB9242(Fire Broadcasting Host). The output power could
be 150W/300W/500W.
4） GB9221 series fire alarm broadcast amplifiers assemble high quality power
transformers internally.The static power consumption is low and the overload
capability is high.GB9221 series have overload and over-temperature protection
circuit, buzzer alarm when a fault occurs.
2 Main Specifications
1） Power supply： AC220V(+10%,-15%,50Hz)
DC：see table1-1
2） Line input sensitivity： 300mV ～775mV（line1、line2）
3） Line output level： 500mV ± 100mV
4） Effective frequency range
for distortion limitation： 80Hz ～ 8kHz
5） Total harmonic distortion：< 5%
6） SNR： > 70dB
7） Monitor power： 3W
8） Fixed output voltage： 120V（fixed voltage mode）
9) Rated output power： 150W/300W/500W
10) Working environment： a）temperature 0℃-40℃
b）humidity <92％
11) Insulation resistance： a）backup power input&the chassis
＞20MΩ（DC500V）
b）AC input voltage&the chassis
＞50MΩ(DC500V)
c）fixed output voltage&the chassis
＞50MΩ(DC500V)

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12) Electrical strength： no breakdown between AC input&the chassis
leakage current＜5mA（AC2000V）
3 Function buttons and Indicator LEDs
1) Front panel（figure 4-1）：
9
10 876
3 4 51 2
POWER AMPLIFIER
POWER
ON
OFF
POWER OUTPUT LEVEL SHORT TEMP
MONITOR
MUTE
TEST
VOLUME
figure 4-1 front panel diagram（take 500W as an example）
1. power on/off
2. volume adjustment LED indicator
3. volume adjustment knob
4.button【self test】
5.button【silence】
6.button【monitor】
7.over temperature fault LED indicator
8.overload fault LED indicator
9.output level LED indicator
10.power LED indicator
2) back panel(figure 4-2)：
V
～
1200V 24V
+ -
Ⅱ
ⅠⅡⅠ
48V
+ -
N L E
25A
12
OUTPUT EMERGENCY
INPUT
OUTPUT
INPUT
OUTPUT POWER：500W
8A
34
figure 4-2 back panel diagram（take 500W as an example）
1. AC power input terminal
2.Backup power input terminal
3.Power amplifier fixed voltage output & external fire alarm trigger input terminal

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4.Music source input/output terminal
4 Appearance Mounting dimensions&Weight
1) Appearance and mounting dimensions（figure5-1）：482.6mm * 345mm *
132.5mm (length*width*height)
OFF
ON
POWER
POWER AMPLIFIER
VOLUME
TEST
MUTE
MONITOR
TEMP
SHORTPOWER OUTPUT LEVEL
320
465
482.6
132.5
57
345
Figure 5-1 Appearance and mounting dimensions
2）weight： <18kg
5 Wiring instructions
1） power cable connection：
a) Connect from 220V terminal to ～220V terminal using one 3-cores sheathed
cable.Pay attention to the order of N/L/E.
b) Connect the backup power supply that meets the nominal requirements to the
"Standby Power" terminal.Pay attention to positive and negative polarity.
c) Power cable diameter requirement
150W
300W
500W
AC power cables
1mm2
1mm2
1.5mm2
DC power cables
1.5mm2
1.5mm2
2.5mm2
2）input cables connection：
a) Connect the external source signal cable to the “Line input I”on the rear
panel. Please use high quality shielded cable.
b) Connection of fire trigger signal: connect the 24V level signal given by
the controller to the "fire trigger" terminal. Please note the positive and
negative polarity of this signal. Generally, this signal should be directly output

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by the alarm controller or provided by the output module.
3）Output line connection：
a) Line output This interface is used to extend power amplifier or transfer audio
signal to other audio equipment. When the machine cannot meet the needs of field
application, power amplifier can be extended through this interface. The
connection line with the power amplifier should adopt high-quality shielded wire.
b) Fixed voltage output Fixed voltage output is power amplifier output, which
can be directly connected with fixed voltage speaker or broadcast circuit through
GB9231/GB9232 broadcast divider. RVS double twisted copper core wire above
1mm² should be used for fixed voltage output line. The line diameter should be
increased when long distance.
6 Installation and Debug
1）Correct connection shall be made according to the wiring instructions before
debugging.
2）The power LED(green) is on when power on.
3）Please do not connect any external circuit to the power amplifier before
troubleshooting. Please test if there’s short between the circuit and the chassis
using a multimeter or other test equipment to check the insulation resistance.It
is easy to damage machine when the power is turned on under short conditions.
4）When the circuit debug finished, preset volume should be set after the fire
alarm is triggered. After the preset volume is set, the machine can be used normally.
7 Instructions for use
1）Make sure the line connection is correct before use.
2）Output volume adjustment: The output volume can be changed by turning the front
panel “Volume Adjustment” knob.There are corresponding instructions. Note: It is
not allowed to change the volume in the emergency broadcast state.
3）Preset emergency broadcast volume: The emergency broadcast volume refers to
the volume under the emergency broadcast state. This volume should be manually preset
before use. It is effective after the fire alarm is triggered and cannot be manually
adjusted. The way to preset is as follows：
In non-emergency state, adjust the volume to the appropriate position, press on
the [volume adjustment]knob for more than 2 seconds,the alarm buzzer will keep ringing.
Then release the knob.
4）Fault alarm, noise elimination and reset：
◆ Overtemperature: when the internal transistor temperature exceeds the set
temperature limit (90℃), over temperature fault occurs. The indicator LED (yellow)
is always on.Cut off the power supply of the main circuit and send an alarm buzzer.When
the temperature is lower than the set value,system will automatically cancel the alarm
and restore.

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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
1Main&backup power
connected OK?
1Check main power supply
voltage and standby power
supply polarity
2AC fuse OK?
2Replace 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
1Output load shorted
2External load exceeds
the rated capacity
1Check the fixed voltage output
circuit
2Reduce 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

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6mm*30mm
GB9221/300W
300W
48V
5A
15A
GB9221/150W
150W
24V
3A
15A
Table 1-1 Equipment model and parameter comparison table
11 Attached parts and components
No.
Project
Notes
1
Instruction manual 1
2
2 AC fuses 2 DC fuses
See table1-1
3
Audio cable 1
4
Certificate 1
Attached to the
chassis