MBS IDNR 8.6.0251/02-2020 (Index_04)
page 8 of 9
ROI-3 measurement transducer
Select the correct ROI-3 transducer (ratio).
Connect the FASK Rogowski coil to the input of the ROI-3 transducer!
The FASK Rogowski current transformer and its connection cables must not exhibit any insulation damage.
The output signal (1 A) must be connected exclusively with potential-separated 1 A current transformer in-
puts.
It is prohibited to connect the input or output signal with external voltage. This can lead to the destruction of
the ROI-3 measurement transducer.
Ensure adequate dimensioning of the power supply unit (24 V / 1 A)!
It is necessary to connect the earth of the supply voltage (- 24 V) to ground (GND)
Do not use the device in close proximity to strong, high frequency fields (distortion of the measured value)
Liability
The choice of the transducer used, as well as the selection of the measuring devices used, are the sole responsibility
of the user. No liability or guarantee is assumed for this choice. The information in the catalogs and data sheets does
not represent any assurance of special properties, but results from empirical values and measurements. Liability for
damage caused by incorrect operation / configuration or malfunctions of the measuring circuit is excluded. The opera-
tor / project planner must ensure that incorrect operation, incorrect configuration and malfunctions cannot cause fur-
ther damage.
No warranty is assumed for defects and damage caused by improper use of the FASK Rogowski current transformer
or the ROI-3 measurement transducer or by disregarding this manual.
Installation instructions and connection diagram
As with any Rogowski coil, the positioning of the primary conductor affects the accuracy. The FASK series is designed
in such a way that the slightest error occurs directly on the lock and thus in the area of the fixing option. The following
figure illustrates this and defines the exact error values.
Primary conductor position
Typical error [%]
Right on the clasp
< 0.5
In the center up to the outer
edges of the coil
< 0.8
Right on the opposite side of
the clasp
< 1.0
