SV-EMS-220 Installation and Configuration
SkyView System Installation Guide - Revision K 7-45
required for its current and voltage drop. Also note that the power and ground connections on
LEDs are not reversible.
Engine Information
Use the Engine Information Wizard (SETUP MENU > EMS SETUP > ENGINE INFORMATION) to
specify the engine type, its horsepower rating, its redline and cruise RPM, the RPM pulse
configuration, and tach and Hobbs 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
and special operating limitations. If your engine is not listed, choose "Other."
Horsepower is used to do some of the % power calculations 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 hour at your cruise RPM, tach time will increment
one hour. If you spend 1 hour at 1/2 your cruise RPM, tach time will only increase by 1/2 hour.
Tach time is defined as TIME x (CURRENT RPM / CRUISE RPM).
Hobbs time is a simple timer that runs whenever the oil pressure is above 15 PSI or the engine
is above 0 RPM.
If you have connected an External Alarm Light to SV-EMS-220 pin 29, the Alarm Light setting
determines how the light behaves after alarm acknowledgement. It can be set to either SOLIID
AFTER ACK, which leaves the light lit continuously after acknowledgement (until the alarm
condition ceases) or OFF AFTER ACK, which turns the light off after an alarm has been
acknowledged.
Rotax 912 Behavior
Setting ENGINE TYPE to ROTAX 912 pre-configures some engine settings for a Rotax 912 engine.
SkyView will automatically configure and dynamically change the oil temperature and
tachometer scales and alert thresholds in accordance with Rotax’s recommended ranges,
described in detail below. When this mode is selected, EMS SETUP > SENSOR SETUP > OIL
TEMPERATURE AND TACHOMETER settings are unavailable.
Tachometer for Rotax 912:
When OIL TEMP < 120ºF, the TACHOMETER displays these ranges:
0-1400 and 4000-6000 RPM in RED
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