Diamond Aircraft DV 20 E 2022, Airplane Maintenance Manual

Page: 255 / 903

AIRCRAFT
DV 20 E AMM Electrical Power
Doc # 4.02.25
Rev. 2
24-00-00
Page 1
15 Mar 2022
CHAPTER 24
ELECTRICAL POWER
1. General
The DV 20 E has a 14 V DC electrical system. This chapter describes the electrical system of the
DV 20 E.
This Chapter has only simplified schematic diagrams and location diagrams. Refer to Chapter 92 for
the wiring diagrams. Refer to the related Chapter for data about the system.
For Trouble-Shooting and Maintenance Practices for this system, refer to these Sections:
)
Section 24-30. Electrical power generation.
)
Section 24-31. Battery system.
)
Section 24-60. Power distribution.
Note: Equipment which is certified for installation in the DV 20 E is listed in Section 6.5 of the Airplane
Flight Manual. Such equipment may be installed in accordance with the Airplane Maintenance
Manual.
Any equipment which is not listed in Section 6.5 of the Airplane Flight Manual is called “Additional
Equipment”. The installation of Additional Equipment is a modification which must be handled in
accordance with nation regulations or a Service Bulletin.
Throughout this chapter the nomenclatures “generator” and “alternator” are used for the same
component. For DV 20 E airplane purposes, the terms “generator” and “alternator” are
interchangeable in this document.
2. 14 VDC System Description and Operation
Figure 1 shows the simplified electrical system schematic diagram.
A. Power Supplies
(1) Main Battery
The main battery is located on the front left hand side of the firewall. It is a 12 V, 25 Ah sealed
battery. It connects to the firewall ground point, the battery relay and the BACKUP circuit
breaker.
(2) Alternators
The BRP Rotax 912 iS engine has an internal alternator with two isolated coils, thus individual
alternators. Each alternator is controlled by its own regulator, both located on the fuse box.
Refer to Section 24-30 for more information of DC Generation.