44
Function Description
WAGO-I/O-SYSTEM 750
750-493 3-Phase Power Measurement Module
Manual
Version 1.2.0
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
x D-CTR
Measured value
48900 W
95500 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
x D-CTR
Measured value
44705 Wh
2195000 Wh
* Register 35: Setting in the register defines the scaling factor PI for energy values
D. User Scaling ON, Measurement with Current Transformer 500:1 A
(1A Variants) and 500:5 A (5A Variants)
In this example, the D-CTR is divided into two parts: D-CTR1 is programmed in
the I/O module and taken into account with the process value, the other one
D-CTR 2 must be taken into account externally, in the high-level PLC, when
calculating the measured value:
500:1 A => D-CTR = 500 - D-CTR1 = 50, D-CTR2 = 10
500:5 A => D-CTR = 100 - D-CTR1 = 50, D-CTR2 = 2
Due to the high internal resolution of the current measurement in the I/O module,
the process values are available with mA resolution. The resolution and data type
of other measured values must be observed, so that the measured values do not
exceed the range limits (e.g. for the measured power values).
Current
750-493
750-493/000-001
Register 32, bit 0
1
1
Register 37 (D-CTR1) 0x0032 (50)
0x0032 (50)
Process value
0xA6AF (42671)
0x2103 (8451)
Scaling factor PI
0.001 A / LSB
0.005 A / LSB
Equation
Measured value = Process value x Scaling factor PI
x D-CTR2
Measured value
426.71 A
84.51 A
Note: Resolution of the current values in 10mA steps