7.1 Basic / Load Sections 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Control interval - How often, in milliseconds, the MS3Pro updates its calculations. Does not affect the speed
at which the field switches in high speed feedback field control, but it does change other calculations such as
target voltage.
• Control output - What pin is used for alternator control output.
• Output polarity - If set to normal, turning the output on sends the signal to increase voltage. If set to inverted,
an on signal decreases voltage.
• Control frequency - What frequency is used to pulse the output in open loop duty or closed loop field control
mode.
• Warning lamp output - If this output is enabled, the MS3Pro will trigger it if the voltage drops below the
target voltage minus the warn on voltage difference setting.
• Warn on voltage difference - How far the battery voltage needs to drop below target voltage to trigger the
warning lamp output, if used.
• Load monitor input - Allows using a PWM load signal from an alternator, such as the “F” terminal on many
GM alternators. Not available in field control modes.
• Capture polarity - Determines if the PWM signal is based on sending voltage or being pulled low.
• Warn on load - Triggers the warning light output if the load signal goes above this value.
• Closed loop PID settings - When using closed loop field control, allows you to set the sensitivity of the
closed loop response. See notes on closed loop idle tuning for how these settings work.
• Current monitor input - Allows using a PWM signal to monitor alternator output current. This number can
be sent to a gauge, but does not affect calculations.
• Capture polarity - Determines if the PWM signal is based on sending voltage or being pulled low for the
current monitor input.
• Startup delay - How many seconds to wait after engine start before turning on the alternator.
• Ramp up time - How many seconds to take the alternator from zero output to charging voltage after the
startup delay is complete.
• Battery temperature input - Allows using a battery temperature sensor to adjust charging voltage based on
battery temperature. This must first be defined as a generic sensor under Advanced Engine.
• Charge mode target voltage - If you are not using a battery temperature input, the MS3Pro will always
target this voltage during the charge time. After the charge time is complete, it switches to run mode target
voltage.
• Charge time - The time, in minutes, to apply the charging voltage.
• Run mode target voltage - The voltage to target after charge time is complete.
• WOT TPS% - Above this TPS reading, the MS3Pro can drop the target voltage to free up more power.
• WOT target voltage - The voltage to target above the WOT percentage.
• WOT timeout - After this many seconds at full throttle, target voltage returns to charge voltage (if during the
charge time) or run voltage (if the charge time is complete).
• Over-run target voltage - The voltage to target when the overrun fuel cut is active. A higher voltage will
create a minor engine braking effect.
• Target charge voltage curve - When you enable battery temperature input, this allows you to define the
charging voltage target as a function of battery temperature.
• Alternator control frequency - When control mode is set to open loop frequency, this lets you specify what
frequency commands what charging voltage.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 134
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