Trio Avionics EZ Pilot - v 1.9 - Manual (Page 38)

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7.8.2.2 Flight Time and Distance Totalizer Displays
This display shows the total accumulated flight time and total accumulated flight
distance in nautical miles. This display cannot be reset and is saved once each
minute in nonvolatile memory.
8.0 Electrical Requirements
For your EZ Pilot to operate properly, it is important to assure that it has been installed properly.
Pay particular attention to assuring correct wire size and careful connector assembly. If
soldering, be sure to use shrink tubing to cover the solder joints, and provide support for the
harness assembly so it is not affected by vibration. If you crimp the wires, be sure to use the
proper tool.
8.1 Primary Input Power
The EZ Pilot requires an input power on pin 13 of 10 to 14 VDC at 1 amp and servo
power on pin 19 or 18 of approximately 1 amp. The EZ Pilot is internally fused and
requires wire from a circuit breaker capable of supplying approximately 3 amps. Both the
autopilot and servo power are normally supplied from the same circuit breaker. 24 gauge
wire is recommended although a larger size (22 or 20) is acceptable. The power ground
should be a minimum 24 AWG wire size and is connected to pin 11. This wire should be
the same size or larger (lower gauge number) as that used for the input power to pin 13.
Additional ground wires are required to supply the current return path for other EZ Pilot
signals.
8.2 Servo Power
The EZ pilot is capable of switching up to 5 amps of DC power to the EZ Pilot servo. The
current servo design draws less than 1 amp (max) under heavy load conditions. The roll
servo power is supplied to J1 pin 19 and the switched power to the servo is available on
pin 25. The servo ground is available on pin 9, or a suitable airframe ground can be
used instead. This wire should be the same size or larger (lower gauge number) as that
used for connections to pin 19 and 25.
8.3 GPS Data Input
The GPS data input signal is to J1 pin 7. The ground signal for the GPS is on pin 8. This
wire can be 26 gauge or larger.
8.4 Remote Display Brightness / Mode Switching
J1 pin 1 can be grounded momentarily to provide a signal input for controlling display
brightness. This switch is identical in function to the EZ Pilot DISPLAY switch.
Optionally, this pin can be used to enable the remote MODE switching capability. In
either case the dimming and the mode function of the front panel switches remains
effective.
8.5 Autopilot Servo Disconnect
This signal is a momentary ground input to the EZ Pilot on pin 14. Momentarily
grounding this pin causes the Servo power signal on pin 25 to be disconnected, which
effectively disconnects the EZ Pilot from the control system. Alternatively, this signal is
used to enter the PCS mode.