12
appropriate or safe. Excess advance can result in loss of power, overheating, and/or damage to
the engine. For this reason:
1) The MAP plumbing for two ignitions should be separate. A plumbing failure on one side would
affect one
– not both ignitions.
2) The cockpit
Mode Switch
(required for boosted engines) is a simple and effective override that
will bypass the MAP input (plumbing failures) and set the ignition to Fixed Mode firing (where
MAP input is not a factor)
– see Mode Switch elsewhere in this manual.
Setpoints
(Reference drawing Fig A)
1) TC
(YELLOW LED - with audible tone) signals the ignition top center position.
2) MIN
(BLUE LED)
– A firing reference set to match engine mfg. recommended (magneto) firing
angle - typically 20 to 25 degrees before top center:
a)
Marks the low advance (high power) end of the firing range in Variable Mode.
b)
Also marks the fixed firing position in Fixed Mode.
3) MAX
(WHITE LED)
– A firing reference that marks the high advance (cruise power) end of the
Variable Mode firing range. The default setting for MAX is 9 degrees ahead of MIN. Can be set
anywhere between 6 and 9-degrees before MIN.
4) DIR
(not a setpoint per-se)
–
The ignition’s current operating direction (rotation) is confirmed by
various means throughout the installation process.
(i.e. if it’s wrong the system will catch it later.)
Note 1: Anytime you move a TC, MIN, or MAX setpoint, reconfirm the stored setpoint positions of
all three. Some changes will restore the original factory default (override the custom setting you
last made). Setpoints should be stored in order
– TC, then MIN, then MAX as shown
throughout the manual.
Set Ignition Timing
Factory rotation direction (DIR) will be pre-configured for overhead mounted
ignitions, but it needs to be confirmed. DIR is checked at several points
during the Setup process and is easy to change when/if needed. The first
opportunity to check DIR is prior to insertion
.
Look directly into the vacant
accessory case ignition drive opening while turning the prop in the normal
direction. If the ignition drive socket turns
:
•
Clockwise - you have a RED engine (DIR color).
•
Counterclockwise - you have a GREEN engine (DIR color).
1)
Mount Ignition:
Verify bus power is OFF and Kill Switch is OFF
(grounded). Turn ignition rotor by hand to align rotor lugs with rubber
cushions in the ignition drive socket. Insert the ignition (with gasket) and
secure mounting clamps finger tight. Rotate the ignition to any convenient orientation and then
tighten mounting clamps to 17 ft/lb.
2)
DIR Color-Burst:
Verify bus power and Kill Switches are all OFF. Connect the ignition circular
Control Plug and then turn bus power ON. LED will provide a Color-Burst sequence (in the first
