Honeywell BENDIX/KING KAP 140 Maintenance Manual page 80

command of 2V will produce a voltage of 10V across the motor. The servo motor drive is powered
by an internal regulator, which limits the maximum voltage that can be applied to the motor.
The TRIM FAIL signal from the FCC is connected to the trim servo disable input, which turns off
the internal regulator and is used to remove power from the servo motor when the trim monitoring
detects a failure. In certain installations, the trim fail annunciator is isolated, through a diode, from
the trim disable input.
The TRIM_VOLTAGE input to the KC 140 is taken from the drive voltage on the KS 272C servo
motor. This analog input can be viewed on the ANALOG VOLTAGE INPUTS diagnostic page.
DIAGNOSTIC NAME
Trim Voltage
4.3.5 TURN COORDINATOR INTERFACE TO THE KC 140
PIN
P1401 -- 3
P1401 -- 10
P1401 -- 21
RATE_VALID is an active high discrete input to the KC 140. The rate information from the Turn
Coordinator is determined to be valid when the RATE_VALID input is >9V. This indicates when the
rate gyro is spinning at a minimum required speed. The ROLL_RATE input to the KC 140 is an
analog input. The current rate value and valid from the Turn Coordinator can be displayed on the
ANALOG INPUTS diagnostics page.
DIAGNOSTIC NAME
Roll Rate
Roll Steering
4.3.6 DIRECTIONAL GYRO (DG) INTERFACE TO THE KC 140
PIN
P1401 -- 11
P1401 -- 27
P1402 -- 17
P1402 -- 18
P1402 -- 19
If a directional gyro is used with the KAP 140 autopilot system , four wires interface the DG to the
KC 140. They are the CRS_DATUM input, CRS_HDG_REF input, the DG_+15VDC power line,
and the DG_--15VDC power line. The DG_VALID signal is hard--wired to ground (always valid)
in a directional gyro installation. The DG_+15VDC and DG_--15VDC power lines provide power
Revision 2, Dec/2002
CS:15574F02.IDU
BENDIX/KING
KAP 140
SCALE FACTOR
1 V/V
DESCRIPTION
ROLL_RATE_+
RATE_VALID ("Rate Gyro Valid" in diagnos-
tics)
ROLL_RATE_--
SCALE FACTOR
333.3 mV/deg/sec
2V/deg/sec
DESCRIPTION
DG_VALID
CRS_HDG_REF
CRS_DATUM_+
DG_+15VDC
DG_--15VDC
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