Toshiba Tosvert VF-AS1 - Manual (Page 234)

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10
10. 3 Installation of an overload relay
1) The VF-AS1 inverter has an electronic-thermal overload protective function.
In the following cases, however, an overload relay suitable for the adjustment of the motor electronic thermal
protection level (VJT) or appropriate to the motor used should be installed between the inverter and the motor.
• When using a motor with a current rating different to that of the corresponding Toshiba general-purpose motor
• When operating a single motor with an output smaller than that of the applicable standard motor.
When operating multiple motors at a time, be sure to install an overload relay for each individual motor.
2) When using the VF-AS1 inverter to operate a constant-torque motor, such as the Toshiba VF motor, adjust the
protection characteristic of the electronic thermal protection unit (NO) to the VF motor use.
3) It is recommended to use a motor with a thermal relay embedded in the motor coil to give sufficient protection to
the motor, especially when it runs in a low-speed range.