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Function Description
WAGO-I/O-SYSTEM 750
750-494 3-Phase Power Measurement Module
Manual
Version 1.2.0
Rotary field:
• Direction of rotation
Limit values:
• Undervoltage Lx
• Overvoltage Lx
• Overcurrent Lx
Harmonics!
In general, the first harmonic means the fundamental wave and the second
harmonic means the wave with double frequency etc.!
Alternatively, the following
DC measured values
are available if DC
measurement has been activated in the I/O module. See section "Commissioning"
> "Configuration with WAGO-I/O-
CHECK
".
DC measurements only possible in 2 measuring channels!
DC measurements are only possible in the measuring channels L1-IL1 and L2-
IL2!
Voltage:
• DC voltage
Lx-N
Current:
• DC current Lx
Power:
• Power (DC current) Lx
4.3
Description of Measured Values
Calculating the RMS Values for Current and Voltage
The I/O module measures the true RMS of the voltages and currents applied to
the measurement inputs per period. See figure below.
∑
=
=
N-1
0
k
2
k
N
1
eff
i
I
∑
=
=
N-1
0
k
2
k
N
1
eff
u
U
i
k
: Sampling value of current
I
eff
:
RMS value of the current
u
k
: Sampling value of voltage
U
eff
: RMS value of the voltage