SKY899
Installation Manual
Page A-8 - Appendix A
009-11900-001
July 18, 2013
Revision F
SIGNAL
CHARACTERISTICS
Operational Mode Output
Operational mode output can drive a lamp annunciating when the system
(optional)
is in operational mode. Output is switched to ground when system is in
operation mode. The lamp requires a separate dc source (constant or
dimming circuit). If lamp voltage is an ac source then an isolation relay
must be used.
CONNECTION
Connector-Pin
Signal Name
P1-31
OPER_MODE
CABLE
Minimum 22 AWG wire for lengths up to 30 ft.
VOLTAGE
ON: 0 V dc or Ground
OFF:
M32 V dc or open
CURRENT
Maximum current 300 mA.
Power Input (TRC)
18-32 V dc. A 5 A circuit breaker is required.
CONNECTION
Connector-Pin
Signal Name
P8-A
+28V
P8-B
+28V_RET
CABLE
Use #16 AWG (min.) twisted shielded pair
cable (Beldon 83322, Alpha 2826/2, or
equivalent). Terminate shield to airframe at
sensor or power source.
VOLTAGE
18 to 32 V dc, 2.0 Amps (Maximum)
Radio Altimeter (Analog)
A radio altimeter enables ground intruder filtering, optimizes TA
sensitivity levels, and makes it possible to inhibit audio below 400 AGL.
Some analog radio altimeters utilize a discrete valid/invalid signal line to
indicate radio altitude validity, while others set the analog data input line
to a high out-of-range value for invalid altitude conditions. If a discrete
flag signal is not available leave RADIO_ALT_FLG (P1-14)
unconnected.
Some analog radio altimeters have multiple outputs (e.g., King model
KRA405), verify the output connected to matches the signal
characteristics listed in table A-1.
CONNECTION
Connector-Pin Signal Name
P1-6
RAD_ALT_IN_HI
P1-7
RAD_ALT_IN_LO
P1-14
RADIO_ALT_FLG
CABLE
Minimum 22 AWG twisted shielded pair
cables for lengths up to 30 ft for signal input.
Minimum 22 AWG wire for lengths up to 30
ft for flag input.
VOLTAGE
0 to +35 V dc
LOAD Z
>100 k Ohm
MAX CAPACITANCE <20 pF per line.
The document reference is online, please check the correspondence between the online documentation and the printed version.
