Toshiba VFNC3-2001P Instruction Manual

E6581595J-410 Magnetic contactor in the secondary circuitA magnetic contactor may be installed on the secondary side to switch controlled motors or supplycommercial power to the load when the inverter is out of operation.Notes on wiring• Be sure to interlock the magnetic contactor on the secondary side with the power supply to prevent commercialpower from being applied to the inverter output terminals.• When installing a magnetic contactor (MC) between the inverter and the motor, avoid turning the magneticcontactor on or off during operation. Turning the magnetic contactor on or off during operation causes a currentto rush into the inverter which could lead to malfunction.10.3 Installation of an overload relay1) The VF-nC3 inverter has an electronic-thermal overload protective function.In the following cases, however, an overload relay suitable for the adjustment of the motor electronicthermal protection level () and appropriate to the motor used should be installed between the inverterand the motor.• When using a motor with a current rating different to that of the corresponding Toshiba general-purposemotor• When operating a single motor with an output smaller than that of the applicable standard motor or morethan one motor simultaneously.2) When using the VF-nC3 inverter to operate a constant-torque motor, such as the Toshiba VF motor, adjustthe protection characteristic of the electronic thermal protection unit (0m) to the VF motor use.3) It is recommended to use a motor with a thermal relay embedded in the motor coil to give sufficientprotection to the motor, especially when it runs in a low-speed range.efesotomasyon.com -Toshiba inverter,drive,servo,plc