PS Engineering
PAC45T Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-045-5100
Page 2-5
Rev. 2, Jan. 2019
2.4.7
Audio Alerts
The PAC45T contains an independent audio alerting systems that will play nine alert audio tones.
The alert system has a power input (P451-42) that will keep the systems operable if the PAC45T systems
power source is removed. Alert audio is provided in Fail-safe when power is on P451-23.
Alert Input
Function
Input Pins
1
Altitude Alert
P453 – 10
2
Autopilot Disconnect
P453 – 11
3
Gear Warning
P453 – 12
4
Stall Warning
P453 - 13
5
Overspeed Warning
P453 - 14
6
Decision Height
P453 - 19
7
Seat Belt Tone
P453 - 20
8
Fire Bell
P453 - 21
9
Pitch Trim Warning
P453 - 22
Alert Power
P451 - 42
Remote
Acknowledge
P453 – 23
The alert triggers can be configured to be Active High (>4.5 VDC) or Active Low (<0.5 VDC), and trigger
at the leading edge transition or by the voltage level. See §
Alerts with edge triggers will play three times or until the remote Acknowledge button (ACK) ( P454-9
grounded).
Alerts with level trigger will play three times or until the Acknowledge button (ACK) is pressed (P453-23-9
grounded), or the input level reverts.
As configured from the factory for the HUB45R, P/N 050-045-5101, all alerts are level triggered except for
Alert 7, the Seat belt Chime, which is edge triggered.
When power is applied to the alerts and not the PAC45T audio controller, it will play the message three times
or until the remote acknowledge is selected.
Audio alerts are inhibited for the first 30 seconds after power up to reduce nuisance triggers.
2.5 User Adjustments
The PAC45T is factory set for typical installation. However, several installation adjustments are avail-
able.
2.5.1
Unswitched Audio Level
Unswitched inputs one through four are installation adjustable through the side of the PAC45T unit.
2.5.2
Adjustments
On the side of the HUB45R are 15 adjustment potentiometers.