Appendix C Current Transformer Of The Fan; Current Transformer Model Selection; Wiring Of Current Transformer Of The Fan - INVT Goodrive300-01A Series Operation Manual

Goodrive300-01A series VFD for air compressor

Appendix C Current transformer of the fan

C.1 Current transformer model selection
Power of the cooling
fan (kW)
0.75
1.1
1.5
2.2
3
4
5.5
Note:
1. The fan can sustain tripled overload at a short-time. In order to ensure the fan can be protected by
the VFD properly, the current on input side of the current transformer should be more than three
times of the rated current of the fan.
2. You can select the transformation ratio of the current transformer. Transformation ratio of 200 or
1000 is recommended.
C.2 Wiring of current transformer of the fan
The transformer should be purchased by the user. The figure below illustrates the wiring precautions
for transformer. If the transformer actually used differs from the one shown in the figure below, please
consult with the transformer manufacturers.
1. If users adopt 2-phase combined current transformer, please refer to the wiring diagram below.
S/B phase R/A phase
P1
P2
Cables on the fan side
The main circuit cable must go in from P1 and out from P2. The coil a, b and c on output side of the
transformer must be connected to la, lb and lc respectively. A and B must correspond to a and b
respectively.
2. If users choose single current transformer, refer to the wiring diagram below.
Rated current of cooling
fan (A)
2
2.7
3.7
5
6.8
8.8
11.6
to GD300-01A multi-function
expansion card
c b a
Recommended transformation ratio
R/A phase
Ia
Ib
Ic
S/B phase
Dotted terminal of current transformer
-168-
Current transformer of the fan
of the transformer
40A/40mA
a
P1
c
P2
P2
b
P1
Ia
Ic
Ib