Toshiba TOSVERT VF-AS3 Instruction Manual page 60

Be
grounded
2
Prohibited
Mandatory
action
Pay attention to the following when wiring.
■ Measures for noise
To prevent electrical interference due to high-frequency noise generated by the inverter, separately
bundle wires to the power circuit's power side terminals ([R/L1], [S/L2], [T/L3]) and wires to the
motor side terminals ([U/T1], [V/T2], [W/T3]).
■ Control power supply
The control power of this inverter is supplied inside from the power circuit power supply. Therefore, if
9
a malfunction or trip causes the power circuit to be shut off, control power will also be shut off.
• To check the cause of the malfunction or trip, set <F602: Trip record retention> to "1: Retain at
power off."
• To make the control circuit continuously operate even if the power circuit is shut off due to malfunction
or tripping, use an optional control power supply unit and supply power to the control circuit.
■ Wiring
• For power terminals, use ferrules with insulation sleeve terminal and crimp-style terminal with
insulation sleeve. Connect the terminals so that adjacent terminals do not touch each other.
• For the sizes of electric wires used in the power circuit, refer to the table in [10. 1].
• The length of each wire is assumed to be 30 m or less. If the wire length is over 30 m, the wire size
(diameter) must be increased.
• For grounding terminal, use wires of the size that is equivalent to or larger than those given in
table [10. 1] and always ground the inverter.
• Wire the grounding wire as close as possible to the inverter.
• To ground the inverter unit, connect it to an exclusive grounding terminal. Do not use screws of the
case, chassis, etc.
• Tighten the screws of the power terminal block and the control terminal block to the recommended
tightening torque shown in the table [2. 3. 3] and [2. 3. 5] respectively.
2. Installation and wiring
• The grounding wire must be connected securely.
If the grounding wire is not securely connected, when the inverter has failure or earth leakage,
this will result in electric shock or fire.
• Do not attach devices with built-in capacitors (such as noise reduction filters or surge
absorbers) to the output terminals (motor side).
Heat rises up and this could cause a fire.
• Following type of screwdriver should be used;
Frame size A1 : PH2 (phillips, bit type2), shaft diameter 5.0mm or less
Frame size A2 : PH2 (phillips, bit type2), shaft diameter 5.8mm or less
CAUTION
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E6582062