3.7.2.2 Pressure Sensor:
Resistive type sensors or 4-20mA sensor interface
Measurement Type
Programmable
• Resistance measurement by measuring voltage
across sensor with a fixed current applied
• 4-20 mA output sensors
Arrangement
Resistive: Differential resistance measurement input
4-20 mA: Burden of 100 Ω
Measurement Current
Resistive: 13 mA independent of System Voltage
Full scale
600 Ohms
Resolution
0.1 bar
Accuracy
Resistive :<1% of Full scale ± 4 Ω excluding transducer errors
4-20mA: 2% of full scale excluding transducer error
Max Common Mode Voltage
0.5V
Display Range
Depends upon the sensor selected. (Sensor can be selected
from pre-programmed sensors or user can program sensor
data for resistive sensor)
3.7.3 Charging Alternator Interface
Excitation
• Magnetizing Current
220mA @12V (Typical)
110mA @24V (Typical)
Measurement
• Range
• 0-40V
• Accuracy
• 1% of reading
• Resolution
• 0.1V
Whenever the generator is required to run, the terminal provides excitation current to the charge
alternator field winding. When the charge alternator is correctly charging the battery, the voltage of the
terminal is close to the battery supply voltage. In a failed charge situation, the voltage of this terminal is
pulled down to a low voltage. It is this drop in voltage that triggers the charge failure alarm.
3.8 MPU Input
Freq Range
5Hz -7.5KHz
Load
10K Ω
Voltage Input Min
3V
Voltage Input Max
40V
Input Wave Form
Square
Input From
Magnetic Pickup Unit (MPU)
Charging Alternator W point (Should not be very noisy)
