47
276 Hidden Valley Grove NW
Calgary, Alberta, Canada T3A 5W9
Phone 403-671-4015
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All SDS software, PCB design and this manual is the exclusive property of Simple Digital System. Unauthorized
use or reproduction is a violation of copyright.
Tach Output Frequency
For setting up your engine monitor or steam type tachometer, 4 cylinder systems output 2 pulses per crank rev,
6 cylinder systems are 3 pulses per rev and 8 cylinder are 4 pulses per rev.
Yellow wire from DB25 outputs a 12V tach signal, green wire outputs a 5V tach signal.
Warnings
Warning Regarding Vertical Power VP-X and SDS
It has come to our attention that the VP-X electronic switching/ circuit breaker box does not use average current
draw over several seconds to trip breakers like conventional thermal breakers do. It may trip during normal
operation due to peak current transients over only a few milliseconds. This can lead the pulsing current of the
ignition coils and injectors to trigger the breaker far below nominal current levels. We believe this could cause a
serious flight safety issue and engine stoppage. Be sure to set the breaker values on the VP-X far higher than
the nominal current draw on these circuits. Be aware that average current draw can increases with rpm and load
so ground running may not allow complete testing of this condition if static rpm is lower than flight rpm and
engine shutdown could occur in flight. Breakers are to protect the wiring, not the device. We recommend each 4
cylinder coil pack have a rating of at least 15 amps assigned when using the VP-X, each 6 cylinder coil pack at
least 20 amps, 4 cylinder injector power at 15 amps, 6 cylinder at 20 amps and 8 cylinder at 25 amps. These
are only recommendations, use this information at your own risk and these values should be thoroughly
tested prior to flight at WOT and maximum rpm the engine will see in flight.
Revisions
May 12/20 V31 update info regarding RPM Fuel. Some changes to troubleshooting.
Dec 12/19, add DB pinout.
Dec 12/19, V30 software updates.
Oct. 15/19. Air temperature type changed on Lycoming engines with new photo added.
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