IMC CANSAS - Sensors Requiring Adjustment of Their Supply; Userdefined Characteristic Curves; Sensor Supply Module

UNI8: universal 423
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.20.6 Sensors requiring adjustment of their supply
+in
-in
V Supply
I;
1
/
4
Bridge
GND
R
cabl e
R
cabl e
sense
C
A
B
F
G
D
NIPPONDENSO
e.g. for Nippondenso pressure sensors
This applies especially to Nippondenso pressure
sensors, for instance.
If a sensor's supply must not be susceptible to voltage
drop along the supply cable, it can be adjusted by the
device. The option Adjust control as per: in the
settings interface's dialog Universal amplifiers /
General must be selected.
If the resistors in the feed lines are equal, the supply
voltage is adjusted at the sensor– the voltage drop
along the cable is compensated.
The sensor is supplied via Terminals C and D. The
sensor returns the measurement signal in reference to
its own ground.
UNI8 makes a differential measurement of the signal between A and B.
Note that there must be a jumper between Pins B and F. Pin F is the Sense connection. It serves to
measure the voltage drop at the lower voltage feed line.
Adjustment can only be activated for either 5 V or 10 V supply. It can only compensate up to 0.5 V for the
supply and return lines together. This means that UNI8's internal voltage source can deliver a maximum
of 0.5 V more voltage.
Adjustment works slowly (with a time constant of some seconds) in order to compensate a static voltage
drop.
6.20.7 Userdefined characteristic curves
Userdefined characteristic curves created e.g. by imc SENSORS, can be proceeded with UNI8.
6.20.8 Sensor supply module
UNI8 channels are enhanced with a sensor supply unit, which provides an adjustable supply voltage for
active sensors. The reference potential, in other words the sensor's supply ground contact, is the
terminal GND.
The supply voltage can only be set for all measurement inputs per module.
The supply outputs are electronically protected internally against short circuiting to ground. The
reference potential, in other words the sensor's supply ground contact, is the terminal GND.
The supply voltage can only be set for all measurement inputs in common. The voltage selected is also
the supply for the measurement bridges. If a value other than 5V or 10V is set, bridge measurement is
no longer possible!
Note
Before a sensor will be connected, make sure the voltage supply has been set correctly (not too high).
Therefore the voltage supply must be set and configured using the software. Then the sensor can be
connected. Otherwise the sensor and the CANSAS-module could be damaged.
There is a 5 V pin at the imc connector. That voltage is not available for the CANSAS-modules, only for
the imc CRONOS-series!
The technical data of the sensor supply is listed in the data sheet of the CANSAS-UNI8.
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