Jetter JXM-IO-E30, Руководство пользователя

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Sensor output
VEXT_SEN Parameter Description
Supply output for sensors:
VBAT_ECU is looped through to VEXT_SEN via a PTC resistor. An overcurrent
or short circuit at the sensor supply can be detected.
Abbreviation
VEXT_SEN
Quantity 3
Peak Current Min. 100 mA per channel at 85 °C
Approx. 500 mA per channel at 25 °C
Tab. 17: Sensor output VEXT_SEN
4.6.1 Current diagnostics at the outputs
The limit values vary for each output (see Outputs [
}
16] ).
All outputs are calibrated at the factory to achieve the highest possible accuracy.
For low current values the current measurement is not linear. The measurement
is therefore linearized by the firmware:
T1 T2
A
B
Fig. 4: Graph: Principle of linearization
A
Current value
B
ADC value
■ T1 is 200 mA. Current below this value is displayed as 0.
■ T2 is 500 mA. From 200 mA to 500 mA the measured current value is lin-
earized.
4.6.2 Overcurrent trip at outputs
If overcurrent flows through an output for 500 ms (default value), the overcurrent
shutdown becomes active. This value can be changed using the parameter
OVERCURRENT_TIME. If an overcurrent event is detected, the output shuts
down and the overcurrent bit is set for 10 seconds. During this time the port can-
not be switched on again.
Re-enabling the
port
ü
The JXM-IO-E30 is in the Operational state.
ü
10 s have passed since the output was shut down.
► Set the output value (digital or PWM) of the respective port again.