WAGO I/O System 750 XTR
Function Description 37
750-495/040-010 3-Phase POM 20KV 300A XTR
Manual
Version 1.0.0
Power factor:
• cos phi, Lx (fundamental component)
• PF power factor, Lx (fundamental component and upper
h
i )
• LF power factor, Lx (fundamental component and upper
harmonics)
Phase angle:
• phi Lx
Rotary field:
• Direction of rotation
Limiting value:
• Undervoltage, Lx
• Overvoltage, Lx
• Overcurrent, Lx
The following values are shown only in WAGO-I/O-
CHECK
and in CODESYS
function blocks, not in the process image:
- Active power, total
- Reactive power, total
- Apparent power, total
4.3
Description of the Measured Values
Calculation for Current and Voltage
The I/O module calculates the
true RMS value
for the voltage and current per
period applied at the measurement inputs (see figures below).
𝐼𝐼
𝑅𝑅𝑅𝑅𝑅𝑅
=
�
1
𝑁𝑁
×
� 𝑖𝑖
𝑘𝑘
2
𝑁𝑁−1
𝑘𝑘=0
𝑈𝑈
𝑅𝑅𝑅𝑅𝑅𝑅
=
�
1
𝑁𝑁
×
� 𝑢𝑢
𝑘𝑘
2
𝑁𝑁−1
𝑘𝑘=0
i
k
: Sampling value of current
I
RMS
: RMS of current
u
k
: Sampling value of voltage
U
RMS:
RMS of voltage
N: Number of sampling values