IMC CANSAS - External Sensor Supply (Optional); Connector Plugs SC16, SCI8, SCI16

SC16, SCI8, SCI16 voltage, current and temp. modes 377
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.18.4 External sensor supply (optional)
The modules SCI8, SCI16 and SC16 can optionally be
equipped with a sensor supply. The supply is unipolar and
connects to the DSUB-15 terminals. The voltage is globally
adjustable from 2,5 V to 24 V and applies to both
connection terminals.
Bipolar supply voltages are not supported with these
modules.
The sensor supply voltage is always isolated (by block), both
to the frame and to the block-isolated amplifier potential.
In order to avoid that the common mode voltage is
uncontrolled (due to isolation drift or capacitive
interference), it should be determined externally. Unless
this is already handled by the connected sensors, it can be
accomplished by means of a connection to the module's
CHASSIS.
The contact "(GND)", by contrast, must not be connected and especially not grounded!
Caution
The supply voltage is set on a module-by-module basis and does not apply to all inputs.
The settings are made via software interface. Make sure that the sensor supply is not set too high
before connecting a sensor. Otherwise, both the sensor and the imc CANSAS module could suffer
damage.
Technical specification sensor supply.
6.18.5 Connector plugs SC16, SCI8, SCI16
For the pin assignment of the DSUB-15 plugs see here.
The concept of block-level isolation is associated with certain crucial constraints which affect the use of
the connection terminals or the grounding of certain contact pins:
Example: Voltage measurement with ACC/DSUB-U4, current measurement with ACC/DSUB-I4:
The terminals designated "(GND)" may not have external connections or have externally determined
voltage levels, and in particular may not be grounded!
They carry the internal isolated reference potential of the block-wise isolated
input amplifier ("GND_ISO").
Pin(1) of the DSUB-15 connector also has a particular feature:
It carries a signal which serves the purpose of TEDS sensor recognition. This signal, too, is referenced to
the internal, block-wise isolated parts of the circuit and may not be grounded (CHASSIS).
For this reason, not in particular:
For SCxx / SCIxx –modules, only connectors of the type
"ACC/DSUB" or of the "TEDS/DSUB" group may be used!
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