Dynon Avionics SkyView System Installation Guide - Manual (Page 173)

SV-EMS-220/221 Installation and Configuration
SkyView System Installation Guide – Revision S 7-61
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-220/221 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.
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:

0-1400 and 5800-6000 RPM in RED

1400-1800 and 5500-5800 RPM in YELLOW

1800-5500 RPM in GREEN
At 0 RPM, tachometer alerting is inhibited. When RPM advances above 0, the tachometer alert
is inhibited for 10 seconds to avoid nuisance alarms as the engine starts.
The alarm type for the tachometer is the “self-clearing” type.
Oil Temperature Gauge for Rotax 912:
When OIL TEMP < 190°F, the OIL TEMP gauge displays these ranges:

100-120 and 230-266° F in YELLOW

120-190° F in GREEN if OIL TEMP has been above 190° F “more recently” than OIL TEMP was
below 120° F; otherwise 120-190° F is displayed in BLACK OUTLINED IN WHITE

190-230° F in GREEN

266-280° F in RED.