SV-EMS-220/221 Installation and Configuration
SkyView System Installation Guide - Revision AA 7-73
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.
INHIBIT ENGINE ALERTS AT BOOT: NO | YES
When set to YES, all engine alerts, both audio and visual, will occurs until after the first engine
start, or 5 minutes, whichever comes first. This option can help inhibit nuisance alarms before
the engine is started. When set to NO, engine alerts are always active.
ALARM LIGHT: SOLID AFTER ACK | OFF AFTER ACK
If you have connected an External Alarm Light to SV-EMS-220/221 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.
DISPLAY COOLANT INSTEAD OF CHT: Set to CLNT if the manufacturer of the engine requires that
the label for the temperature of the engine block be displayed as “CLNT” (coolant) rather than
the more common label “CHT” (Cylinder Head Temperature). The default of this option is
“CHT”. Note that not every Rotax engine has this requirement, only newer Rotax engines.
Before changing the default of this setting, consult your Rotax (or other manufacturer) engine
manual.
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 < 120°F, the TACHOMETER displays these ranges:
0-1400 and 4000-6000 RPM in RED
1400-1800 and 2500-4000 RPM in YELLOW
1800-2500 RPM in GREEN
When OIL TEMP > 120°F, the TACHOMETER displays different ranges:
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