CLINK II SCU MANAGER
functional description scu
version 5.0
24
Calculation
Active power is calculated using the following formula:
u = Instantaneous voltage
i = Instantaneous current
P = Active power
In case of DOL1 the factor 3 must be replaced by 1.
Note
The accuracy of the measured value is ± 5%
5.2.6
Power factor
The Power Factor is calculated in the Starter Control Unit from the Active Power, Mains Voltage and
MotorCurrent L1 in case of a 3 phase system or from the connected phase in case of a 1 phase system. The
power factor can be read-out via LCU-5. Select:
SCU Manager - Module Measurement
.
Calculation
Power factor is calculated according to the following formula:
P = Active Power
U = Mains Voltage
I
= Motor current L1
Note: in case of DOL1 factor
must be omitted.
Note
The accuracy of the measured value is ± 5%.
5.2.7
Energy
The energy values are derived in the Starter Control Unit from the calculated powers (active power).
The energy is calculated using the following formula:
Table 15: Power Factor parameter
Name
Range
Unit
Parameter
type
Power Factor
-1.00..+1.00
-
Actual
P
3
T
---
u i
⋅
(
)
0
T
∫
×
t
d
=
PF
P
3 U I
⋅ ⋅
----------------------
=
3
