Calibration When Operating With An Internal Power Supply; Figure 34: Calibration Of The Bridge Voltage U - WAGO 750 Series Manual

82 Calibrating Measured Values
9.2 Calibration when Operating with an Internal Power
Supply
Proceed similarly for operation with an internal power supply. To feed in the
U or U calibrator voltage, however, you have to disconnect the +U
d ref
between the I/O module and the measuring bridge. Otherwise the internal power
supply U
v
damage. In operation with an internal power supply, the two measurement inputs
Uref and U
the line from –U
To calibrate the I/O module, proceed as follows:
1. Connect a measuring bridge (or a comparable resistor network) directly to
the I/O module.
2. Disconnect the +U
3. To calibrate the bridge voltage U
the measuring bridge (see connection example in Figure "Calibration of the
Bridge Voltage U
for Channel 1)").

Figure 34: Calibration of the Bridge Voltage U

Supply (Example for Channel 1)
4. Use WAGO-I/O-CHECK to calibrate the equipment via this calibrator.
5. Remove the calibrator.
6. To calibrate the reference voltage U
to the measuring bridge (see connection example in Figure "Calibration of
the Reference Voltage U
(Example for Channel 1)").
Manual
Version 1.0.0
would be short-circuited with the calibrator and there would be a risk of
are only referenced via the internal power supply U
d
to the measuring bridge must remain.
v
line between the I/O module and the measuring bridge.
v
when Operating with an Internal Power Supply (Example
d
ref
750-1491 2AI Resistor Bridge (Strain Gauge)
(Input 1), connect a calibrator directly to
d
when Operating with an Internal Power
d
(Input 2), connect a calibrator directly
ref
when Operating with an Internal Power Supply
WAGO I/O System 750
line
v
. For this reason,
v