42
Function Description
WAGO-I/O-SYSTEM 750
750-493 3-Phase Power Measurement Module
Manual
Version 1.2.0
The decisive factor is the
maximum
representable current value in the process
image.
If the transformation ratio is 500:1 A, for example, the resulting D-CTR of 500
cannot be taken into account in the I/O module 750-493 (1A) directly via active
user scaling, likewise a D-CTR of 100 at a transformation ratio of 500:5 A in
750-493/000-001 (5A).
Therefore, the following setting options and calculations for the measured values
result in the process image for the current-dependent variables:
A. User Scaling OFF, Measurement without Current Transformer
Current
750-493
750-493/000-001
Register 32, bit 0
0
0
Register 37 (D-CTR) 0x0001 (1)
0x0001 (1)
Process value
0x01A9 (425)
0x033D (829)
Scaling factor PI
0.001 A / LSB
0.005 A / LSB
Equation
Measured value = Process value x Scaling factor PI
Measured value
0.425 A
4.145 A
Active Power
750-493
750-493/000-001
Register 32, bit 0
0
0
Register 37 (D-CTR) 0x0001 (1)
0x0001 (1)
Process value
0x03D2 (978)
0x0776 (1910)
Scaling factor PI
0.1 W / LSB
0.5 W / LSB
Equation
Measured value = Process value x Scaling factor PI
Measured value
97.8 W
955.0 W
Active Energy
750-493
750-493/000-001
Register 32, bit 0
0
0
Register 37 (D-CTR) 0x0001 (1)
0x0001 (1)
Register 35*
1
3
Process value
0x22ED (8941)
0 x 1126(4390)
Scaling factor PI
0.01 Wh / LSB
5 Wh / LSB
Equation
Measured value = Process value x Scaling factor PI
Measured value
89.41 Wh
21950 Wh
* Register 35: Setting in the register defines the scaling factor PI for energy values