Instruction manual

9-14
Section 9-8 - SALL-15S (Supervised Audio Line Level Module
Wheelock, Inc. Part Number: 105497
The Supervised Audio Line Level Module (SALL-15S) provides audio output for the SAFEPATH
®
Panel. The circuit module has a 0.5Vrms, 15 ohm audio NAC circuit, a 24VDC, 2A speaker
amplifier power output, and a 24VDC, 2A strobe NAC Circuit. The circuit module contains a linear
amplifier and supervision circuitry.
The module supervises the strobe NAC circuit field wiring, the speaker amplifier audio field wiring,
the speaker amplifier power NAC circuit field wiring, and the amplifier. The strobe NAC circuit
field wiring and the speaker amplifier power wiring are supervised with a reverse polarity
technique, which applies a DC voltage with one polarity to supervise the wiring and then reverses
the polarity to energize the strobe NAC circuit. The speaker amplifier audio NAC circuit field
wiring is supervised with a DC current, which is removed when audio is being played. Both field-
wiring circuits are only supervised in the standby condition. The amplifier is supervised by
monitoring the amplifier output for audio. The state of each of the four supervision features is
indicated via four LEDs on the printed circuit board. See Figure 9-8 on Page 9-15 for LED
locations.
There are three fuses on the printed circuit board, F1 and F2, and F3. Fuse F1 is the fuse for the
strobe NAC circuit. F2 is the fuse for the speaker amplifier power. F3 is the main fuse for the
entire board. See Figure 9-8 on Page 9-15 for fuse locations.
Three UL LISTED 10K Ohm, 1W, EOLR Resistors are included.
Fuse
Rating
F1 3A
F2 3A
F3 6A
Nominal Specifications:
Rated Output @ 1kHz 500m Vrms, 30 ohm load
Input Sensitivity 1Vrms
S/N Ratio -75dB
Frequency Response 275Hz to 4kHz
Input Voltage 24VDC
Supply Current (Standby) 50mA
Supply Current (Alarm) 135mA (Maximum total current draw is
Add maximum of 2.0 Amps for Strobe current 4.135 Amps
Add maximum of 2.0 Amps for Speaker Amp current
Operating Temperature Range 0 to 49 Degrees C (32-120 Degrees F)
Humidity Range 0 to 85%, Non-condensing