Toshiba TOSVERT VF-AS3 Instruction Manual page 295

• When the wire length between the inverter and motor is long (approx. 20 to 100 m), set <F316:
Carrier frequency control> to "2" or "3".
• Turn off power to set <F316: Carrier frequency control> to "2" or "3".
• Install a sinusoidal filter to the output side of inverter. In this case, set <F316: Carrier frequency
control> to "4" or "5".
• Use a motor with high insulation strength.
• When no decrease of carrier frequency is selected while a high carrier frequency is set, a trip
occurs by Overheat (OH), etc. more easily than the case with automatic decrease.
• With <F316: Carrier frequency control> set to "2" or "3", the carrier frequency is restricted to 4
kHz or less automatically.
• With <F316: Carrier frequency control> set to "4" or "5", the carrier frequency is 4 kHz or more
Important
automatically.
• With <Pt: V/f pattern> set to "2" - "6" or "9" - "12", the carrier frequency is 2 kHz or more
automatically.
■ Reduction of load current
When the ambient temperature is above 40 or 50°C, reduce the current according to "Instruction
manual for load reduction" (E6582116).
An IGBT overload pre-alarm "L" or overheat pre-alarm "H" is displayed when the IGBT overload
"OL3" or overheat "OH" protection level nears.
With <F316: Carrier frequency control> set to "1", "3" or "5", carrier frequency is decreased at IGBT
overload pre-alarm, or overheat pre-alarm to try to prevent "OL3" or "OH"trip. When the cumulative
amount of overload further increases, an "OL3" or "OH" trip will occur. In this case, decrease <F601:
Stall prevention level 1> to avoid trips.
Even when <F300: Carrier frequency> is set to a low value, the carrier frequency increases in the
high output frequency range to ensure stable operation.
• How to operate the operation panel -> Refer to [3. 1. 1].
Reference
• How to switch display mode on the operation panel -> Refer to [3. 1. 2].
• Procedure to change parameter setting -> Refer to [4. 2. 3]
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6. [Advanced] How to use parameters
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