WEG CFW11 Applications Manual page 17

Solar pump drive

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Installation

3.2.2 T4 Model Frame E and F

For CFW11 frequency inverters from 380 to 480 V, model T4 Frame E and F, the following connection is

recommended:

Figure 3.4 – Connection diagram of the solar water pumping system for CFW11 T4

CFW11 T4 Model

Frame A and B

(series contact connection)

Frame C and D

(series contact connection)

Frame E and F

(series contact connection)

NOTE!

Take care to don't reverse the positive and negative voltage connections from the solar modules.

Do not open the contactors KC and/or KB with load.

NOTE!

The inputs/outputs connections may be different from what is indicated in this diagram,

depending on the needs of the application.

Table 3.4 – External pre-charge recommended components

Charge Contactor KC

CWB18 – 18A

CWB25 – 25A

Pre-Charge Resistor RC

60 Ohm / 150 J @ 0,3s

(RH50 – 60 Ohm)

40 Ohm / 1000 J @ 1s

(2X IRV200 – 20 Ohm)

40 Ohm / 7000 J @ 5s

(2X IRV200 – 20 Ohm)

By Pass Contactor KB

CWB9 ~ CWB18

(parallel contact connection)

CWB18 ~ CWB50

(parallel contact connection)

CWM50 ~ CWM250

(parallel contact connection)

Solar Pump Drive | 17

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