SV-EMS-220 Engine Monitoring System Installation and Configuration
10-22 SkyView HDX System Installation Manual - Revision E
important, so ensure that you are routing the positive side (yellow for K-type; white for J-
type) of the thermocouple to pin 27 or pin 36 on the 37-pin harness, and the negative side
to pin 28 or pin 37.
10.5 External EMS Warning Light
SV-EMS-220 D37 pin 29 can be wired and configured as an External Alarm Light.
To wire EMS D37 pin 29 as an External Alarm Light, you may connect any standard LED
or incandescent lamp (1.5 Watt maximum), used during EMS-related “red” warning alarm
conditions. Ensure that the LED or lamp is designed for the voltage of your system. Mount
it to your panel according to its recommendations. Connect one (1) of the lamp’s leads to
your plane’s power. Connect the other lead to pin 29 on the SV-EMS-220 37-pin wiring
harness. During an alarm condition, this pin is connected to ground, causing current to
flow through the lamp.
Aircraft Spruce P/N 17-410 is an example of a light that will work for this application. An
LED and resistor in series will also suffice. If you use an LED as the indicator, you must
choose a resistor that delivers the appropriate current to the LED, and can accommodate
the power required for its current and voltage drop. Also note that the power and ground
connections on LEDs are not reversible.
After installation, you can test the External EMS Warning Light:
SETUP MENU > HARDWARE CALIBRATION > EMS CALIBRATION > EXTERNAL
EMS WARNING LIGHT TEST > (one (1) more right click to enter the menu and
temporarily illuminate the External EMS Warning Light).
10.6 Engine Information
Use the Engine Information Wizard (SETUP MENU > EMS SETUP > ENGINE
INFORMATION) to specify engine type, horsepower rating, redline and cruise RPM, and
set HOBBS and TACH time (if installation is in a non-zero-time engine).
If you have an engine type that is in the list, please choose the appropriate engine. This
will allow the system to perform some calculations that are specific to that engine, such
as % power (Lycoming / Continental only) and special operating limitations (Rotax only).
If your engine is not listed, choose "Other."
Horsepower is used to do some of the % power calculations (Lycoming/Continental
engines only) and the auto Rich-of-Peak and Lean-of-Peak detection. Set it to the engine
manufacturer's rated HP for initial usage. You may need to adjust this number in order to
get all calculations working correctly.
If you are getting an auto Lean-of-Peak indication that is coming on too early, before the
engine actually peaks while leaning, lower this number. It is not meant to be a measure
of actual horsepower produced, as engines that are more efficient will act as if they are
lower horsepower in the calculation. This will be particularly true if you are running a
higher compression ratio than the stock charts are based upon.
Cruise RPM is used when calculating tach time. Tach time is a measure of engine time
normalized to a cruise RPM. If you spend one (1) hour at your cruise RPM, tach time will
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