Honeywell MK VI, MK VIII 4.2.4.2 Synchro Magnetic Heading, 4.2.4.3 Synchro Pitch Attitude, 4.2.4.4 Configuration Defined Synchro Inputs, 4.2.4.5 Signal Timing Reference Inputs

Honeywell

MK VI MK VIII EGPWS Installation Design Guide

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4.2.4.2 Synchro Magnetic Heading

Quantity 1

Synchro Angle Range ±180 deg

Reference Voltages ±26 VACRMS ± 20% (see 4.2.4.4)

Pin Assignment (Signal Mnemonic):

X leg

Y leg

Z leg

J1-22

J1-23

J1-3

(SYN_2X)

(SYN_2Y)

(SYN_2Z)

4.2.4.3 Synchro Pitch Attitude

Quantity 1

Synchro Angle Range ±80 deg

Reference Voltages Not Required

Pin Assignment (Signal Mnemonic):

X leg

Y leg

Z leg

J1-5

J1-7

J1-6

(SYN_3X)

(SYN_3Y)

(SYN_3Z)

4.2.4.4 Configuration Defined Synchro Inputs

Quantity 2

Reference Voltages ±26 VACRMS ± 20%

Pin Assignment (Signal Mnemonic):

#2 X leg

#2 Y leg

#2 Z leg

#3 X leg

#3 Y leg

#3 Z leg

J2-1

J2-2

J2-18

J2-19

J2-20

J2-3

(SYN_4X)

(SYN_4Y)

(SYN_4Z)

(SYN_5X)

(SYN_5Y)

(SYN_5Z)

4.2.4.5 Signal Timing Reference Inputs

These inputs accept 400 Hz AC signals, and detect the “zero crossings” of these signals. These zero crossings are used to

time the conversion and input of AC signals. Absolute voltage level of these signals is not measured, but it must be within

the range specified below. Voltage below the specified minimum value may result in intermittent or “jittery” zero cross

detection.

Timing reference signals are required for input of most AC devices (not required for pitch and roll). These references can be

brought into the appropriate timing reference input, or the system can be configured to derive a reference from the signal.

Timing reference signals are specified for synchro inputs requiring a range greater than ± 80 degrees. Inputs requiring less

(i.e., Roll Attitude) are configured to derive a reference from the synchro input signal and do not require a separate reference

voltage input.

Quantity 2

Input Impedance > 140KΩ each line to signal ground

Maximum Reverse Fault Current < 120 µA

A/C Input Signal Frequency Range 400 Hz, ±10%

Maximum Input Voltage Swing (differential) 50V between input legs

Maximum Input Voltage Swing (ref. to Gnd) 50V from any leg to signal ground

Input Hardware Filtering None

Minimum Input Voltage ± 0.5 VAC

Pin Assignment (Signal Mnemonic):

26VAC Reference #1 H

26VAC Reference #1 C

26VAC Reference #2 H

26VAC Reference #2 C

J1-4

J1-24

J2-34

J2-35

(26REF_1H)

(26REF_1L)

(26REF_2H)

(26REF_2L)