CFW500 | 21
Installation and Connection
English
3.2.3.5 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 CFW500 is in accordance with
the UL508C standard. Note the following information:
1. Trip current equal to 1.2 times the motor rated current (P0401).
2. When parameters P0156, P0157 and P0158 (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 P0401.
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 turning 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 25.
Connect a fourth cable between the motor ground and the inverter ground.
When using shielded cables to install the motor:
Follow the safety recommendations of IEC/EN 60034-25.
Use the low impedance connection for high frequencies to connect the cable shield to the
grounding. Use parts supplied with the inverter.
The accessory "CFW500-KPCSx power and control cable shielding kit" can be mounted in the
lower part of the cabinet. Figure 3.3 on page 22 shows a detailed example of the connection
of the power supply and the motor cable shield to the accessory CFW500-KPCSA. Besides,
this accessory allows the connection of the control cable shield.
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