INVT Goodrive300-01A Series Operation Manual page 162

Goodrive300-01A series VFD for air compressor
Appendix C Current transformer of the fan
C.1 Current transformer model selections
Power of the cooling
fan (kW)
0.75
1.1
1.5
2.2
3
4
5.5
Note:
 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.
 The transformation ratio of the current transformer must be 1000.
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 chose single current transformer, refer to the wiring diagram below.
Rated current A of
cooling fan
2
2.7
3.7
5
6.8
8.8
11.6
to GD300-01A control
board
Ia
c b a
Ib
Ic
Recommended transformation ratio
P1
R/A phase
P2
P2
S/B phase
P1
Dotted terminal of current transformer
-157-
Current transformer of the fan
of the transformer
40A/40mA
a
Ia
c
Ic
Ib
b