Special Precautions - Panasonic VF100 Instruction Manual

2. Special Precautions

¡ôUse the inverter only within tolerable ambient temperature range.(-10 to +50
Because the life of the inverter is greatly affected by ambient temperature, use it within
tolerable temperature range.
Also, pay attention to the installation directions and conditions. (See page 12)
¡ôThe inverter will be damaged if the power voltage is applied to its output terminal.
Applying power voltage to the output terminal U, V or W will damage the inverter.
Check carefully for fault wiring and operation sequence (commercial changeover circuit, etc.).
Never apply a voltage that exceeds the tolerable voltage of the inverter.
¡ôNever touch the inside of the inverter during operation.
This is extremely dangerous the inverter contains high-voltage circuit. Be sure to wait at
least 5 minutes after the inverter power has been turned OFF, before making an internal
check. Do not touch the heat sink fins or brake resistor during operation as these parts
will become hot during operation.
¡ôRadio interference
The main circuit of the inverter contains a higher harmonic component and may interfere
with communications equipment such as AM radios if these are used nearby. The amount
of radio interference depends on the field strength in the area where the inverter is used.
While it is difficult to completely eliminate radio interference, it may be reduced by changing
the angle of your radio antenna, using a noise filter with the inverter, housing the inverter in
a metallic shield box, or routing inverter cables in metal conduit. (Please inquire separately.)
¡ôDo not attempt insulation testing between the inverter cables.
To measure the insulation resistance of the power supply cables or the motor cables,
them from the inverter. Never conduct insulation testing on the control circuits. However,
insulation testing can be performed between the charging unit and the ground.
¡ôIf a magnetic contactor is connected to the power supply side or the load side
of the inverter, never use it to start or stop the motor (inverter).
Switching the inverter on the power supply side ON and OFF frequently by a magnetic
contactor, can cause the inverter to malfunction. Do not turn the inverter on the load side
ON and OFF during operation as this causes inverter fault trips. Start or stop the motor
only by means of inverter run signals.
¡ôDo not connect a power factor capacitor or suppressor to the output terminal
of the inverter.
Such devices can damage the inverter, its capacitors and other parts. Remove the device
if one is connected.
¡ôDo not use the inverter for loads other than a motor or for single-phase motors.
¡ôIf parameters are frequently written in, lifetime of non-volatile memory (EEPROM)
will be shorten.
The maximum writing times of non-volatile memory (EEPROM) used in
VF100 is 100,000 times. Therefore, do not write the parameters frequently.
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