SAFEPATH Manual
Sheet 70 of 78
Rev. C April 1999
Self Amplified Speaker Control/Signal Circuit Module, (SACM-4)
The self amplified speaker control/signal circuit module, (SACM-4) provides audio output for the SAFEPATH system. The circuit
module has a -5 dBm, 15 ohm audio output, a 24VDC, 2A speaker amplifier power output, and a 24VDC, 2A strobe output. The
circuit module contains a linear amplifier and supervision circuitry.
The circuit module supervises the strobe field wiring, the speaker amplifier audio field wiring, the speaker amplifier power field
wiring, and the amplifier. The strobe 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
strobes. The speaker amplifier audio 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 state. The amplifier is supervised by monitoring the amplifier output for
audio. The state of each of the four supervision features is indicated via four indicators on the printed circuit board. See Figure 35
for indicator locations.
There are three fuses on the printed circuit board, F1 and F2, and F3. Fuse F1 is the fuse for the strobe power. F2 is the fuse for
the speaker amplifier power. F3 is the main fuse for the entire board. See Figure 35 for fuse locations.
Fuse Rating
F1 3A
F2 3A
F3 6A
Nominal Specifications:
Rated Output @ 1kHz 500m Vrms, 15 ohm load
Input
Sensitivity 1Vrms
S/N
Ratio -75dB
Frequency
Response 275Hz
to
4kHz
Input
Voltage 24VDC
Supply Current (Idle) @ 24VDC 50mA
Supply Current (Full Load) @ 24VDC 135mA
Operating
Temperature
Range 0
to 49 Degrees C (32-120 Degrees F)
Humidity
Range 0
to
85%,
Non-condensing
Summary of Contents for SAFEPATH SAPE-1AB
Page 19: ...SAFEPATH Manual Sheet 20 of 78 Rev C April 1999 Figure 3 Operator s Console...
Page 24: ...SAFEPATH Manual Sheet 25 of 78 Rev C April 1999 Figure 5 DX 100 Module Illustration...
Page 25: ...SAFEPATH Manual Sheet 26 of 78 Rev C April 1999 Figure 6 DX 200 Module Illustration...
Page 28: ...SAFEPATH Manual Sheet 29 of 78 Rev C April 1999 Figure 7 SAFEPATH Panel Mounting...
Page 32: ...SAFEPATH Manual Sheet 33 of 78 Rev C April 1999 Figure 8 Typical System Block Diagram...
Page 62: ...SAFEPATH Manual Sheet 63 of 78 Rev C April 1999 Figure 30 Module Layout of the SAFEPATH Panel...
Page 63: ...SAFEPATH Manual Sheet 64 of 78 Rev C April 1999 Figure 31 SAFEPATH Panel Block Diagram...
