Van's Aircraft RV-12 Pilot Operating Handbook page 22

Date: 04/06/18
VOLTAGE REGULATOR FAILURE
(Silent Hektik Voltage Regulator Installed)
NOTE The regulator has a voltage ramp up schedule and will
take 30 mins to reach full output.
If an optional warning light is installed for the D-180 the voltage
regulator will give a warning for one of three reasons. All three
should be considered.
1) Overvoltage condition
2) No generator output
3) Over Temp Condition
If the generator would fail and cause an overvoltage condition
the regulator will shut down automatically and give a warning. If
the generator would fail and no longer provide output a warning
will be given. Without the engine running when the aircraft is first
turned on a warning will be shown because there is no generator
output. Note that for both of these warnings the generator will no
longer be charging the battery or supplying power to the main
bus. As a result the main bus voltage will drop helping the pilot to
realize along with the warning that power is no longer being
supplied from the generator.
If an over-temp condition occurs the voltage regulator will
continue to supply power to the main bus (the bus voltage will
remain normal) but a warning will be given. This would most
likely occur in elevated temperatures during lengthy ground
operations, during a long climb at slow airspeed, or after
extended periods of slow flight just above stall speed. These are
extreme conditions not seen during most normal operations. If a
warning is given in flight reduce the angle of attack and increase
airspeed to help the flow of cooling air across the voltage
regulator. If a warning is given on the ground increase the engine
rpm to force more air through the cooling duct.
3-6 D-180
RV-12 PILOT'S OPERATING HANDBOOK
Revision: 6