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Part 3. System Setup and settings less likely to be
changed:
It is a good idea to confirm all these settings, many of which will not need to be changed.
LOP MAX MANIFOLD PRESSURE
LOP, Lean Of Peak ignition advance will not occur when engine manifold pressure is
higher than this setting, even if the LOP is activated and the LOP LED is lit up.
Typical setting is around 25”Hg Absolute. If you don’t want the Lop advanced timing at
high manifold pressures then you can lower this setting some more. This effectively
blocks the LOP advance at lower altitudes when at full throttle.
# Of Coilpacks
New for Ver1.4, this window only appears on Single board CPi-2’s. If you have only 1
coilpack then the setting needs to be
1
. If your Single CPi-2 is driving two coilpacks to
run all 8 spark plugs on a 4 cylinder engine then this setting must be set to
2
. This
window does not appear on Dual CPi-2’s because each board only ever drives a
single coilpack so there is no need for this selection in this case.
Tach Output
With Normal setting tach pulses will be 2 pulses per rev on
4cyl, 3 pulses/rev on 6cyl and 4 pulses per rev on an 8cyl
engine. With 1PPR setting output will be 1 pulse per
crankshaft revolution on all number of cylinders. Use the 1
PPR setting if your instrument panel tach is reading extra high RPM’s.
Battery Charge
Enables or Disables Trickle charge on the Backup Battery. With our recommended
backup battery this option should be set to enabled. With other batteries it could be
enabled or disabled depending on requirements. If another charging method is used
for your backup battery then you should set this to DISABLED.
On Dual board systems: In the Primary board, this is normally enabled. In the Backup board this will default to
Disabled, as the dual board systems cannot allow both primary and backup boards to trickle charge the backup
battery.
Main Battery Type
This is to select the type of main battery in the aircraft
so the CPi2 knows when to switch power over to the
backup battery. In the event of an alternator failure the
CPi2 attempts to run on the main battery as long as
possible before switching over to the backup battery. Important to have this set correctly. Select either Pb for Lead-
acid or Li for Lithium Ion. The number following is Mainbus cutoff voltage when the CPi2 switches over to battery
backup. Select using the plus key.
Backup Battery Type
This is the CPi2 backup battery type. Select either Pb for
Lead-acid and also Pb for AGM(glass mat).
Select Li for Lithium Ion. Each has a different cutoff for
trickle charging.
Mainbus Cali
No photo. If required you can use this to calibrate Mainbus voltage. Incrementing by 1 will increase the reading by
0.1 volts. To get a negative calibration, example –1, you need to enter 255. –2 enter 254 etc.
