WEG CFW300 User Manual - page 21
16 | CFW300
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Installation and Connection
If the brake resistor is mounted within the cabinet of the inverter, consider its energy when
dimensioning the ventilation of the cabinet.
DANGER!
The internal braking circuit and the resistor may be damaged if the latter is not
properly dimensioned and/or if the voltage of the input power supply exceeds the
maximum value permitted. In order to avoid the destruction of the resistor or risk
of fire, the only guaranteed method is the inclusion of a thermal relay in series with
the resistor and/or a thermostat in contact with its housing, connected in such
a way to disconnect the input power supply of the inverter in case of overload,
as shown in
Set P151 at maximum value when using dynamic braking.
The voltage level on the DC Link for activation of the dynamic braking is defined by the
parameter P153 (level of the dynamic braking).
Refer to the CFW300 programming manual.
3.2.3.4 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 CFW300 is in accordance with
the UL508C standard. Note the following information:
1. Trip current equal to 1.2 times the motor rated current (P401).
ATTENTION!
If a disconnect switch or a contactor is installed at the power supply between the
inverter and the motor, never operate it with the motor spinning or with voltage
at the inverter output.
The characteristics of the cable used to connect the motor to the inverter, as well as its
interconnection and routing, are extremely important to avoid electromagnetic interference in
other equipment and not to affect the life cycle of windings and bearings of the controlled motors.
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.),
according to
Item 3.2.6 Cable Separation Distance on page 18
.
When using shielded cables to install the motor:
Follow the recommendations of IEC60034-25.
Use the low impedance connection for high frequencies to connect the cable shield to the
grounding.