Technical data

Chapter 4: Installation
Series SPB Audio Boosters Manual, Revision A
4-5
Table 4-2. Terminal Blocks Connection Definitions
Symbol Full Name Definition
TB1
AC IN AC sensing Input Connection
Factory connection senses proper AC Voltage input. Low AC or no AC input
will light the AC LED and cause a trouble condition.
STB IN Strobe Input (SPB-80/4 Only)
Power limited 8 to 33VDC (10mA) NAC power limited source or contact
closure input. Initiates Strobe Outputs on the SPB-80/4 only
TB2
STB RET Strobe Return (SPB-80/4 Only)
Strobe Input Return - Used to continue strobe input circuit, connecting
additional strobe input circuits from audio boosters, Strobe appliances or
voice evacuation panel’s 1/2W EOLR.
DC IN DC Input
Factory wired 24VDC Input from power supply (SPBPS)
TB3
BATTERY Battery
24VDC Battery connection for battery charging and battery backup.
TB4
AC TRB
AC Trouble Reporting
Provides AC loss trouble when reporting to off-site location.
AUD2 OUT Audio 2 Output (SPB-160 Only)
Audio Output #2 - Provides 25V or 70.7V, power limited audio output at 80
watts. Supervised using a UL Listed 10K Ohm 1/2W EOLR.
AUD1 OUT Audio 1 Output
Audio Output #1 - Provides 25V or 70.7V power limited audio output at 80
watts. Supervised using a UL Listed 10K Ohm 1/2W EOLR.
STB2 OUT Strobe 2 Output (SPB-80/4
Only)
Regulated 27VDC at 2.0A NAC power limited Supervised using a UL Listed
10K Ohm 1/2W EOLR.
TB5
STB1 OUT Strobe 1 Output (SPB-80/4
Only)
Regulated 27VDC at 2.0A NAC power limited Supervised using a UL Listed
10K Ohm 1/2W EOLR.
AUDIO IN Audio Input
1V, 25V, or 70.7V power limited audio input. Blocking capacitor for DC
Supervision. Power consumption is 1.2 Watts @ 70.7V and 0.25 Watts @
25V.
AUDIO RET Audio Return
Audio Input Return. Used to continue Audio Circuit from the voice
evacuation panel, connecting additional audio boosters, or voice evacuation
panel’s 1/2W EOLR.
AUX IN Auxiliary Input
8 to 33VDC (10mA) NAC power limited source or contact closure input.
Used in the Four Wire mode. Applying an alarm input restores audio booster
to full power from the power saver mode when panel is in battery backup
mode.
TB6
AUX RET Auxiliary Return
8-33VDC (10mA) NAC power limited source (only) Auxiliary input return.
Used to connect to additional audio boosters through the voice evacuation
panel.
EXP OUT Expansion Out
27VDC at 0.5A power limited circuit energized when a signal is applied to
AUX IN or Strobe In. Reverse polarity Supervised using a UL Listed 10K
Ohm 1/2W 1/2W EOLR.
TB7
DC OUT DC Output
27VDC at 0.5A, non-power limited used for splitter power only.
TB8
TRB
Trouble Reporting
Provides trouble reporting when not connected to SP40S.