8
VALCOM
Controls, and Indicators, Terminals and Connections
Figure 10 shows the controls and indicators, terminals and connectors on the rear panel of the AmpliCenter. Table 2 identifies them
by function.
Figure 10. AmpliCenter Controls and Indicators, Terminals and Connector
Table 2: Controls and Indicators, Terminals and Connections
1.
AC Power in: D300A - 115/230V 50/60Hz user selectable. D40/D100A – 100–250VAC 50/60Hz auto select.
2.
Output (Pins 3 & 4), an auxiliary output that differs from the main 70.7V
output in that it
is a low level (0dB
)
, 600
Ohm
balanced output used for driving a remote or off-premises
amplifier. User output page access contact closure on outer Pins
2 & 5.
3.
DC Power, and 70V audio out to Controller (Used only if Controller is also installed).
4.
Low frequency cut-off screw-type adjustment pot. Attenuates low frequencies so that horns and small speakers are not
overdriven by excessive bass energy. Cut off
frequency is adjustable from 50Hz (Full CCW) to
400Hz (Full CW).
5.
Music In: Left and/or Right channels with ground.
Paging In: redundant paging input same as page in RJ11 (Ground, C1, Tip and Ring).
70V Out: Balanced output used for terminating the loudspeaker wiring.
6.
Screw adjustable potentiometers: VOX
sensitivity level, music ducking (mute level for music during voice
page). Music level
for various music
sources. Adjusting CAL (page volume calibration) too high can cause the page signal to clip.
7.
LEDs:
Green - Power On, lights when AC line voltage is applied to AmpliCenter.
Red – Overload, lights when the AmpliCenter output exceeds its output power rating. This can occur when total
speaker load is greater than the output rating, or when speaker wiring is shorted.
Red – UnbalancedOoutput, indicates when one speaker lead is accidentally shorted to ground.
Green – Page Accessed, lights when voice paging is active.
8.
Telephone system mode switch: Dry Loop 600 Ohms, Dry Loop Hi Z, Ground Start or Loop Start.
9.
Page Audio input (Pins 3 & 4) from host telephone system or Controller RJ11 connector: Paging audio and page control
input contact closure outer conductors (Pins 2 & 5) C1 to GND.
