Toshiba TOSVERT VF-AS3 Instruction Manual page 9

■ Operations
• Do not touch terminals when the inverter's power is on even if the motor is stopped.
Touching the terminals while voltage is applied will result in electric shock.
• Do not touch switches when the hands are wet and do not try to clean the inverter with a damp cloth.
This will result in electric shock.
• Do not touch terminals or motor of the inverter while performing auto tuning.
Touching the terminals or motor while voltage is applied to the terminals and motor may result
in electric shock, even if the motor is stopped.
Prohibited
After setting offline auto-tuning (F400 = "2"), execute the auto tuning at first start of the inverter.
The auto tuning takes several seconds and the motor is stopped meanwhile, but voltage is
applied to the terminals and motor. The motor may also generate a sound during the auto
tuning, but this is not malfunction.
• Turn the power on only after mounting the front cover.
When you use the inverter housed in the cabinet with the front cover removed, always close the
cabinet doors first and then turn the power on. If you turn the power on with the front cover or
the cabinet doors open, this will result in electric shock.
• Make sure to set the setup menu correctly.
If you set the setup menu incorrectly, this will damage the inverter or cause the inverter to
perform unexpected movement.
• Make sure to set the parameter correctly.
If you set the parameter incorrectly, this will damage the inverter or cause the inverter to
perform unexpected movement. When you write the parameter in the inverter via a parameter
Mandatory
action
writer or operation panel, please transmit correct data.
• Make sure that operation instructions are off before resetting the inverter after malfunction.
If the inverter is reset while the operation instructions are on, the motor will restart suddenly,
resulting in injury.
• Install circuit protection such as the mechanical brake in the crane.
If there is no sufficient circuit protection installed in the crane, insufficient motor torque while
auto tuning will cause the machine stalling/falling.
• Observe all allowable operating ranges of motors and machines in use.
Not observing these ranges will result in damage to motors and machines and injury. Please
use motors and machines within their respective allowable operating ranges by referring to
their respective instruction manuals.
• Do not set the stall prevention level parameters (F601 and F185) extremely low.
If the stall prevention level parameters (F601 and F185) are set at or below the motor no-load
Prohibited current, the stall preventive function will be always enabled and increase the frequency when it
judges that regenerative braking is taking place.
Do not set the stall prevention level parameters (F601 and F185) at 30% or less under normal
use conditions.
Warning
Caution
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I. Safety precautions