4.5.6
Testing the measuring circuit
A simple test with the load cells connected can be carried out with a multimeter.
Note:
In the case of an external load cell supply voltage or use of an isolating unit, the internal
load cell supply is not relevant.
Measuring voltage
0–12 mV = @ LC with 1.0 mV/V
0–24 mV = @ LC with 2.0 mV/V
4.5.7
External supply to load cells
If the total resistance of the load cells is ≤75
Ω
(e.g., more than 4 load cells with 350
Ω
),
an external load cell supply is required. In this case, the internal supply is replaced by a
potential-free external supply.
The center of the external supply voltage (0 ext. supply) should be connected to the
device housing to ensure that the voltage reacts symmetrically to 0.
The internal supply is not connected.
If the external supply is <8 V DC (±4 V DC), a solder bridge (closed when delivered) must
be opened on the main board (see Chapter
) to reduce the sense voltage to below
approx. ±4 V DC.
4 Device installation
X3 Process Indicator PR 5410
EN-49
Minebea Intec
