DG Flugzeugbau DG-800A, Maintenance Manual, Page: 37 / 163

Maintenance Manual DG-808C
Issued: May 2012 TN800/41 1.24
1.14.3 Control unit
This aluminium box is located in the relay compartment. The control unit
incorporates the following functions:
1.
Master switch relays.
2. Control of the extension-retraction procedure. The extension-retraction
relays are also mounted inside the unit.
3. Regulator/generator, also supplies power to the fuel- and coolant-
pumps with the masterswitch off.
4. Startermotor control: The starter motor is actuated by a power
electronic, no relays. This applies to the normal engine start (ignition
on) and also the slow turning of the propeller into retraction position
(ignition off). Activation is via the starter button.
5. Control of the primer valve.
6. Control of the refuelling pump.
7. Fuses for several circuits are installed in the control unit see section
1.14.13.
Caution: To avoid damage disconnect the power plug first when removing the
control unit. Plug in the power plug after the other plugs when installing the
unit,
Caution: When you plug in the connector plugs, carefully fix the plugs with
their screws. Secure the screws with Loctite 221 or 222 (low strength thread
securing).
1.14.4 Generator – Regulator:
The generator is located in the ring gear housing and is incorporated with
the ignition/ timing sensors. It is connected to a voltage regulator and can
provide a maximum charging current of 10 Amp. The regulator is located
in the control unit see sect. 1.14.3. The generator supplies electrical power
to the fuel and water pumps, even with the master switch off.
1.14.5 Master Switch:
The aircraft is supplied with a master switch (no separate engine master
switch). The master switch supplies in
on position electrical power to all
systems.
The master switch is a key operated switch located in the console below
the instrument panel. The key switch controls a relay in the control unit
which cuts off the electric power.