3 analog transponder interface, 0 alarms and notifi cations, continued – Alpha Technologies APU Control Module (ACM) User Manual
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018-340-B0-001 Rev. A
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4.0
Alarms and Notifi cations, continued
4.3 Analog Transponder Interface
The ACM also provides a transponder interface for proprietary status monitoring. The
transponder interface consists of a 12-position terminal block wtih 8 optically-isolated output
signals and one switch closure input signal. The wiring diagram for the transponder interface
is shown in Fig. 4-3, with the following signals mapped to the transponder interface terminal
block as shown below.
PIN
Input/Output
Description
Active State
1
Output
Major Alarm (1)
Open with respect to Pin 9
2
Output
Minor Alarm (2)
Open with respect to Pin 9
3
Output
Engine Alarm (3)
Open with respect to Pin 9
4
Output
Gas Hazard
Open with respect to Pin 9
5
Output
Test Fail
Open with respect to Pin 9
6
Output
Enclosure Alarm (4)
Open with respect to Pin 9
7
Output
Engine Status
(Running, Stopped)
Closed to Pin 9
8
Output
Tamper
Closed to Pin 9
9
Output Common
10
Input
Engine Run
Connect to Pin 11
11
Ground
Engine Run Return
12
To Be Determined
1. Major Alarms:
• Engine Over-Temp
• DCIU Breaker Trip
• Engine Overcrank
• Output Over-voltage
• Low Fuel
• Water Intrusion
• Pad Shear
• Gas Hazard
Table 4-1, Analog Transponder Interface
3. Engine Alarms:
• Engine Over-Temp
• DCIU Breaker Trip
• Engine Overcrank
4. Enclosure Alarms
• Water Intrusion
• Pad Shear
Alarm Filter Board (P/N 704-717-20) is required when using an embedded propietary transponder or external
transponder.
NOTE:
2. Minor Alarms
• Control Fail
• Self-Test Fail
• Low Ignition Battery
•
Auto-mode
Disabled
•
Tamper
• DC Bus fault
Fig. 4-2, Alarm Filter Board