Wiring (Precautions) - Toshiba TOSVERT VF-AS3 Instruction Manual

■ Wiring
• Do not connect power supply to the output (motor side) terminals [U/T1], [V/T2] and [W/T3].
Connecting power supply to the output will damage the inverter and result in fire.
• Do not insert a braking resistor between DC terminals [PA/+] and [PC/-] or [PO] and[PC/-].
This will result in fire.
Please connect the braking resistor in accordance with the instruction manual.
• Do not touch wires of equipment (e.g. MCCB) that is connected to the inverter power side at
least 15 minutes after turning off the power.
If an electric charge remains in a capacitor in the inverter, touching the wires before the
indicated time will result in electric shock.
• Do not touch output terminals [U/T1], [V/T2] and [W/T3] on the PM motor side while the PM
motor is rotating even after turning off the power.
Prohibited
While the PM motor is rotating even after the power is turned off, as a high voltage is generated
in the output terminals [U/T1], [V/T2] and [W/T3] on the PM motor side, touching the output
terminals will result in electric shock. Please perform wiring after verifying that the PM motor is
stopped.
• When using this 480V class inverter with a power supply system that is grounded in other than
the neutral point (e.g. when the power supply has delta connection with single phase
grounding), the grounding capacitor should not be grounded (or the capacity of the grounding
capacitor should not be increased).
Otherwise, it will result in failure or fire.
• Electrical construction work must be done by a qualified expert.
Erroneous connection of power supply by someone who does not have that expert knowledge
will result in fire or electric shock.
• Connect output terminals (motor side) correctly.
If the phase sequence is incorrect, the motor will operate in reverse and that can result in injury.
• Wiring must be done after installation.
If you perform wiring prior to installation, this will result in electric shock or other injury.
Verify that the power is turned off and the charge lamp is off before starting wiring.
Mandatory
If you perform wiring without verification, this will result in electric shock.
action
• Tighten the screws on the terminal block to specified torque.
If the screws are not tightened sufficiently to the specified torque, this will result in fire.
• Verify that the power supply voltage is within +10% and -15% (±10% when the load is 100% in
continuous operation) of the applied power supply voltage written on the name plate.
If you do not use the appropriate power supply voltage, this will result in failure or fire.
• 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.
Be grounded
WARNING
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I. Safety precautions