CIRCUTOR AFQ Series - Manual (Page 24)

AFQ-4W
24 Instruction Manual
Figure 18: Transformer connection points in the AFQ-4W.
Class 0.2S transformers of the CT or TCH series are recommended.
The use of class 0.2, 0.5s or 0.5 transformers will slightly jeopardise the
behaviour of the active filter although they always provide acceptable harmonic
filtering replies.
The use of transformers with ratios close to the current to be
measured is recommended.
Current transformers TI1, TI2, TI3 must be correctly connected for the
AFQ-4W filters to work properly. If the phases L1, L2 and L3 are
switched in the secondary, the filter will not work properly.
Check the connections and make sure that:
TI1 measures phase 1 and the transformer output cables are
connected in posts S1/L1 and S2/ L1 of the filter cabinet.
TI2 measures phase 2 and the transformer output cables are
connected in posts S1/L2 and S2/ L2 of the filter cabinet.
TI3 measures phase 3 and the transformer output cables are
connected in posts S1/L3 and S2/ L3 of the filter cabinet.