Overload Protection; Motor Thermal Protection; Compliance With Safety Standards - Toshiba TOSVERT VF-AS3 Instruction Manual

• The input withstand rating is obtained with heat calculation. If the fuse is installed to a circuit with
larger input withstand rating, a reactor should be installed so that the input withstand rating should be
reduced below this level.
• Output interrupt rating varies depending on the type of integral solid state short circuit. Install the fuse
according to the NEC standard, local standard and type of installation.
• Use a fuse of Cooper Bussmann or Mersen.
• Be sure to use rod crimp-style terminals for the grounding terminals of the heat sink and metal plate
of the inverter.
9. 2. 4

Overload protection

The overload protection levels are below,
HD rating: 150%-1minute, 180%-2s (Frame size A1~A6)
150%-1minute, 165%-2s (Frame size A7, A8)
ND rating: 120%-1minute, 135%-2s (All frame sizes)
For the rated current, refer to the name plate.
9. 2. 5

Motor thermal protection

To use the electronic thermal function of this inverter for motor thermal protection, set parameters
according to the motor specifications applied. For details, refer to [5. 2. 5].
When operating multiple motors with one inverter, install overload relay for each motor.
9. 2. 6 Motor integrated PTC thermal protection
For details, refer to [6. 30. 19].
9. 2. 7 Other
Contact your Toshiba distributer or Toshiba sales representative (see the back cover of this manual), if
you need the hard copy (paper) of CD-ROM.
9. 3

Compliance with safety standards

For details, refer to "VF-AS3 Safety function manual" (E6582068).
9-11
E6582062
9. Measures to satisfy standards
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