Installation manual

Installation
Apollo MX20 Installation Manual
17
2.5.4 PLACARD
The aircraft will have a placard identifying the MFD circuit breaker. The placard will be placed directly
adjacent to the respective breaker.
2.5.5 POWER
The power and fuse requirements for each external sensor are described in their respective installation
manuals. The MX20 will operate on voltages between 10 and 40 VDC. Install a five amp circuit breaker
for a 14 VDC aircraft and a three amp circuit breaker for a 28 VDC aircraft. Use separate wires for the
heater and CPU power inputs; one wire to each pin. Power and ground wires should be 20 AWG.
2.5.6 ELECTRICAL LOAD ANALYSIS
An electrical load analysis should be completed on each aircraft prior to installation in accordance with
AC 43.13-1B, Chapter 11. Use the following values for computation:
Table 4 – Unit Power Loads
14 VDC 28 VDC
Unit
Typical Max Typical Max
MX20 2.0 A 3.0 A 1 A 1.5 A
MX20 with heater
(1)
3.0 A 4.0 A 1.5 A 2.0 A
MX20 I/O 2.5 A 3.5 A 1.25 A 1.75 A
MX20 I/O with heater
(1)
3.5 A 4.5 A 1.75 A 2.25 A
Notes:
1. Heater element turns on below approximately 30
o
C.
Note: Circuits should be protected in accordance with guidelines in AC 43.13-1B, chapter 11, section 2,
paragraph 429. Power inputs should be across a minimum of all four specified input pins.