CLINK II SCU MANAGER
functional description scu
version 5.0
16
U = RMS value of the mains voltage
u = Instantaneous value of the mains voltage
In order to calculate this value, 16 samples are taken so that up to and including the 8th harmonic is taken into
consideration in the calculation.
Note
•
The accuracy of the measured value is ± 2%.
•
The displayed value of the mains voltage is the voltage measured between phases (phase-phase) except
in case of a single phase motor where the voltage between line and neutral is displayed.
5.2.2
Motor current
The motor current is measured by means of transformers which are placed in the Measurement Interface Unit.
For application of the different types of Measurement Interface Units see Mains configurations SCU‚ page 83.
The nominal current and auxiliary current transformer ratio are set via LCU-5.
Select:
SCU Manager - Unit Properties - tab Meas
, see table 7.
Note
The auxiliary current transformer ratio is the ratio between the primary and secondary current of the auxiliary
current transformer. If no current transformer is applied, the ratio must be set to 1.
The Motor Current can be read-out via LCU-5.
Select:
SCU Manager - Module - Measurement
. See table 8.
The measured values are representative for the phase currents and serve as input for the following protection
functions:
•
Thermal protection, stall: 5.8.4 on page 48
•
Thermal protection, motor overload: 5.8.5 on page 49
•
Phase unbalance: 5.8.6 on page 50
•
Process underload: 5.8.8 on page 51
•
Process overload: 5.8.9 on page 52
Table 7: Setpoints nominal current and auxiliary current transformer ratio
Name
Range
Unit
Parameter
type
Nominal Current MIU
1 - 64
A
Setpoint
Auxiliary CT Ratio
1 - 1200
-
Setpoint
Table 8: Motor current parameter
Name
Range
Unit
Parameter
type
Motor Current L1
0-10.00
I/In
Actual
Motor Current L2
0-10.00
I/In
Actual
Motor Current L3
0-10.00
I/In
Actual
Motor Current L1
0-1,200.000
A
Actual
