Power Supply Reactance; Output Connections - WEG CFW100 User Manual

Installation and Connection

3.2.3.2 Power Supply Reactance

In a general way, the inverters of the CFW100 line can be installed directly in the power supply,
without reactance in the supply. However, check the following:
In order to prevent damages to the inverter and assure the expected useful life, you must
„
have a minimum impedance that provides a line voltage drop of 0.5 %. If the line impedance
(due to the transformers and cabling) is below the values listed in this table, we recommend
the use of a line reactance.
For the calculation of the line reactance necessary to obtain the desired percentage voltage
„
drop, use:
Seeing that:
ΔV - desired line drop, in percentage (%).
V - phase voltage in the inverter input, in volts (V).
e
I - rated current of the inverter input.
e, rat
f - line frequency.

3.2.3.3 Output Connections

ATTENTION!
The inverter has an electronic motor overload protection that must be adjusted
„
according to the driven motor. When several motors are connected to the same
inverter, install individual overload relays for each motor.
The motor overload protection available in the CFW100 is in accordance with
„
the UL508C standard. Note the following information:
1. Trip current equal to 1.2 times the motor rated current (P401).
2. When parameters P156, P157 and P158 (Overload current at 100 %, 50 %
and 5 % of the rated speed, respectively) are manually set, the maximum
value to meet the condition 1 is 1.1 x P401.
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V
e
L = 1592 . ΔV .
I . f
e, rat
[ μH]