Analogue Input Drift Compensation; Sensor Supply Test - Danfoss PVED-CLS User Manual

ENGINEERING TOMORROW
The AD3 input has a fixed 20Hz low-pass filter and is not affected by P3249!
7.6.1.2

Analogue input drift compensation

A radiometric compensation algorithm has been implemented to ensure robustness of the analogue sensor signal either
from the wheel angle senor(s) or from an analogue joystick, even when the 5VDC sensor supply drifts between 4.65 –
5.35VDC. Checks are done between the calibrated sensor supplies (P3217 and P3219) and the actual 5VDC sensor
supply.
Danfoss recommends to activate the drift compensation for analogue sensors without built-in compensation.
The objective is to compensate for any drift in the analogue sensor values as a result of aging or temperature of the
electronic circuits.
To select compensation for the primary analogue sensor and, if present, the redundant analogue sensor, set the parameter
value for P3246 and P3247 both to 255.
If no compensation is needed set parameter P3246 and P3247 both to 0.
Name
5V sensor supply for
primary analogue sensor P3217 U16
during calibration
5V sensor supply for
redundant analogue P3219 U16
sensor during calibration
Voltage compensation
for Primary analogue P3246 U8
sensor
Voltage compensation
for Redundant analogue P3247 U8
sensor
7.6.1.3

Sensor supply test

With P3248, the internal 5V supply on the PVED-CLS' pin 11 can be enabled/disabled. This parameter is only intended
for testing purpose, and should be kept at Enable (P3248 set to 0) all time.
Important
P3248 set to 1 will shut down the sensor supply but not the monitoring of it. So if it is disabled (i.e. P3248 set to 1), an
external 5V supply has to be connected to PVED-CLS sensor supply pin (pin 11) else PVED-CLS will go to safe state.
Important
If an internal 5V is chosen in the PVED-CLS and a WAS of the potentiometer-type, remember to setup the analogue
channel compensation parameters too (P3246 and P3247).
Name
46 | © Danfoss | August 2018
Description of parameter
mVolts Measured Supply voltage during calibration of the primary analogue sensor
Measured Supply voltage during calibration of the redundant analogue
mVolts
sensor
Supply voltage compensation Enable/Disable for processing primary
- Analogue sensor signal
Valid Values: 0 (DISABLE); 255 (ENABLE)
Supply voltage compensation Enable/Disable for processing redundant
- analogue sensor signal
Valid Values: 0 (DISABLE); 255 (ENABLE)
Description of parameter
Table 16
Range
OEM, Dealer 4650 5350
OEM, Dealer 4650 5350
OEM 0 255
OEM 0 255
Range
AQ00000211
5000
5000
255
255