78 Connection
HBM QuantumX
6.1.2 Adjustable sensor supply for active transducers
Some modules can supply active transducers with an excitation voltage of 5…24 V.
When using the adjustable transducer excitation, electrical isolation from the supply voltage
of the amplifier is not required.
The maximum permissible power consumption is 700 mW per channel, in total not more than
2 W. If the power consumption is more than 700 mW on one channel, the transducer
excitation of this channel will switch off. If the power consumption exceeds a total of 2 W, the
device may switch off.
MX840
11
12
1 ... 8
Hsg.
9
Supply voltage 5V ... 24V
1)
Power supply 0V
4
1)
Adjustable via software
Cable shield
Sensor
3 kΩ
Connection as per
measurement principle
Hsg. = housing
CAUTION
The output voltage during idling is up to 20% higher than set when the voltage <8 V. If
a current of 2 mA is drawn, the voltage falls back to the set value.
The condition is met in sensors with a power consumption of min. 20 mW.
This can also be met with an additional resistance of 3 k
Ω if the power consumption is
lower or if the sensors are sensitive.
Check the correct voltage setting when connecting a sensor. Too high a voltage can
destroy the sensor. The voltage value is a part of the MX840 parameterization and can
only be changed with a new parameterization. The sensor supply is switched off in the
delivery condition.
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