Haltech NEXUS R3 Quick Start Manual page 11

NEXUS R3 WIRING
Analog Voltage Inputs (AVI)
SIGNAL
GROUND
Analog Voltage Inputs are inputs to the VCU that
accept variable voltage signals from 0V to 5V
Pull-up resistors are generally enabled for temperature
such as signals from pressure, temperature and
related sensors and switched to ground inputs. The
position sensors.
following configuration requires the pull-up resistor be
These inputs can also accept switched inputs that
enabled.
change between two different voltage levels. The
On Voltage and Off Voltage set in NSP defines what
the thresholds are between the On and Off states.
Common examples of switched inputs include A/C
Request switch and intercooler spray switch.
SIGNAL GROUND
AVIs have a software selectable 1K pull-up
resistor to 5V, which can be enabled or disabled
within the setup page.
Pull-up resistors are generally enabled for
temperature related sensors and switched to
Sensors with a +5V supply do not require the
ground inputs and disabled with external +5V
pull-up resistor be enabled, for example, rotary
supply like a MAP sensor or throttle position
trim modules. Any Sensor +5V pin can be used
sensor .
with any Signal Ground pin for sensors.
Specs:
• Number of channels: 11
• 0 to 5V analog inputs
• 1000 samples per second
• Selectable 1k pull-up to 5V
• -10 to +30V indefinite withstand
• 1.5kHz signal frequency max
AVI
TEMPERATURE SENSOR
AVI
SENSOR +5V
HT-010504 ROTARY TRIM MODULE
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Synchronised Pulsed Inputs (SPI)
Example Wiring Connections
Synchronised Pulsed Inputs are capable of
measuring the position, duty cycle, frequency or
state of a signal, as well as analog voltage inputs.
These inputs are suitable for sensors such as cam
position sensors, fuel composition sensors, road +12V (HBO6)
speed sensors and flat shift switch.
SIGNAL GROUND
Synchronised Pulsed Inputs are compatible with
digital (hall effect or optical) and analog (reluctor)
based sensors, have a maximum input voltage
rating of 25V and can measure up to 22.5kHz
Maximum frequency.
Knock Inputs
Specs:
A knock sensor detects engine knock and sends a
• Number of channels: 6
voltage signal to the VCU.
• -10 to +10V digital input
The NEXUS R3 VCU uses the knock sensor signal
• 0 to 5V analog input
to modify ignition timing if knocking occurs.
• Selectable 1k pull-up to 5V
Knock detection can be performed by the VCU by
• -15 to +30V indefinite withstand
installing a compatible piezoelectric knock sensor
• 22.5kHz signal frequency max
mounted to the engine block.
It is recommended that twin-core shielded cable
Example Wiring Connections
SPI
HT-011000 - HALTECH FLEX FUEL SENSOR
is used for knock sensors. Shields must be
terminated to battery ground at one end only.
Specs:
• Number of channels: 2
• -2.5 to +2.5V AC input only
• 160Hz to 48kHz signal frequency band
• +/-3V indefinite AC voltage withstand
• 50V indefinite DC withstand
KNOCK INPUT
SENSOR GROUND
KNOCK SENSOR
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